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Table of Content

    15 November 2010, Volume 43 Issue 22
    CROP GENETICS & BREEDING·GERMPLASM RESOURCES·MOLECULAR GENETICS
    Molecular Characterization of Lr34/Yr18/Pm38 in 273 CIMMYT Wheat Cultivars and Lines Using Functional Markers
    WU Ling,XIA Xian-chun,ZHU Hua-zhong,LI Shi-zhao,ZHENG You-liang,HE Zhong-hu
    Scientia Agricultura Sinica. 2010, 43(22):  4553-4561 .  doi:10.3864/j.issn.0578-1752.2010.22.001
    Abstract ( 1044 )   PDF (486KB) ( 1336 )   Save
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    【Objective】 The objectives of this study were to characterize the allelic variation at Lr34/Yr18/Pm38 locus in 273 CIMMYT wheat cultivars (lines), evaluate their resistance against stripe rust, leaf rust and powdery mildew, and validate the functional markers for the locus. 【Method】 A total of 273 CIMMYT wheat genotypes were tested using a STS marker csLV34 and 5 functional markers cssfr1-cssfr5 which were developed based on a 3-bp deletion in the exon 11 of Lr34/Yr18/Pm38 gene, and were tested for stripe rust resistance in fields in Chengdu and CIMMYT, respectively, leaf rust in CIMMYT, and powdery mildew in Beijing. 【Result】 The results tested by the STS marker csLV34 showed a 96.7% identity to those of cssfr1-cssfr5. Of the 273 lines, 43 were characterized to have Lr34/Yr18/Pm38 resistance gene, with partial resistance against stripe rust, leaf rust and powdery mildew in field across different environments. 【Conclusion】 The 5 functional markers (cssfr1-cssfr5) could be used to detect the allelic variants in Lr34/Yr18/Pm38 locus, and 43 CIMMYT lines with Lr34/Yr18/Pm38 may be used in wheat breeding targeting for stripe rust, leaf rust and powdery mildew resistance with marker-assisted selection of cssfr3, cssfr4 and cssfr5.

    Genetic Dissection of Plant Height at Different Growth Stages in Common Wheat

    LIU Bin,ZHAO Liang,ZHANG Kun-pu,ZHU Zhan-ling,TIAN Bin,TIAN Ji-chun
    Scientia Agricultura Sinica. 2010, 43(22):  4562-4570 .  doi:10.3864/j.issn.0578-1752.2010.22.002
    Abstract ( 817 )   PDF (585KB) ( 1057 )   Save
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    【Objective】 The QTLs/genes related to stem growth of wheat which are expressed at different stages from jointing to flowering stage were detected. QTLs/genes expression on stem growth were studied to detect the number and genetic effects of QTLs/genes in different development stages, then to attain more genetic information of regulating plant height. 【Method】 Conditional and unconditional QTLs for plant height were studied using a doubled haploid (DH) population with 168 progeny lines, derived from a cross between two elite Chinese wheat cultivars Huapei 3×Yumai 57. Plant height was evaluated at 6 different stages (from jointing stage to flowering period), in different environments in 2008 and 2009 cropping seasons. QTL analyses were performed using a mixed linear model approach and a linkage map consisting of 323 marker loci was used to search QTLs for plant height. 【Result】 A total of 18 unconditional QTLs and 10 conditional QTLs were detected. Among the 18 unconditional QTLs, Qph5D-1 was persistently expressed at 4 stages. Qph4D-1 was persistently expressed at 3 stages. Among the 10 conditional QTLs, Qph5D-1 explained 30.1% of phenotypic variations. Qph4B was detected during 1st to 8th May, explained 20.3% of phenotypic variations. 【Conclusion】 The number and the expression of QTLs have a great change in the development of plant height, which suggest that the QTLs express depending on different developmental stages. The information obtained in this study should be useful for manipulating the QTLs by marker assisted selection (MAS) in wheat dwarf breeding programs.

    Genetic Analysis and Construction of Metabolic Pathway by Mutator-Mediated Albino Mutatant Insertion Sites in Zea mays L.
    WANG Ting-ting,ZHAI Li-hong,SU Xu,FENG Jing,LI Juan,GAO You-jun,TAO Yong-sheng,ZHANG Zu-xin,ZHENG Yong-lian
    Scientia Agricultura Sinica. 2010, 43(22):  4571-4578 .  doi:10.3864/j.issn.0578-1752.2010.22.003
    Abstract ( 858 )   PDF (447KB) ( 804 )   Save
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    【Objective】 A study was conducted to obtain and validate the Mutator(Mu)insertion sites causing albino mutant in the mutagenic population with Mu elements, clone the candidate genes associated with maize albino mutation and analyze the metabolic network among these genes. 【Method】 W22∷Mu containing active MuDR transposon was used to pollinate the elite maize inbred line Z31. Using the M2 and M3 families produced from the above hybrid, the albino mutant was obtained by genetic analysis of phenotype and isolation of Mu insertion sites using Mu-TAIL-PCR. The obtained associated genes causing albino mutation was analyzed by bioinformatics and a metabolic network of these genes was constructed. 【Result】 Forty-one albino seedlings were found within 16 000 plants of 870 M2 families and about 700 plants of 36 M3 families. Thirty-five Mu insertion target sequences were cloned by Mu-TAIL-PCR, among which 14 were found to be related with chlorophyll synthesis and photosynthesis. Five metabolic pathways causing albino mutation were constructed with 6 target sequences. 【Conclusion】 The preliminary confirmation was that the 27 target sites by Mutator transposon insertion associated with the albino mutatants, meanwhile we constructed chlorophyll metabolic network pathway through six target sites from albino mutation of maize leaf.

    Analysis of Gene Expression Profiles in Soybean Roots Under Drought Stress
    SONG Wen-wen,LI Wen-bin,HAN Xue,GAO Mu-juan,WANG Ji-an
    Scientia Agricultura Sinica. 2010, 43(22):  4579-4586 .  doi:10.3864/j.issn.0578-1752.2010.22.004
    Abstract ( 855 )   PDF (609KB) ( 1055 )   Save
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    【Objective】 The objective of this experiment is to study the mechanism of drought resistance in soybean seedling roots. 【Method】 The gene expression of drought-tolerant soybean roots was analyzed under different times of drought stress by cDNA microarray chip. 【Result】 The expression profile of 61 171 genes was obtained. Great changes took place in soybean roots under drought stress and the number of induced genes was more than that of repressed genes. The differential expressions of four genes were confirmed by real-time quantitative PCR and the results indicated that the expression changes of these genes were generally consistent with the results of gene chip. The clustering analysis of hybridization was also carried out to indicate gene expression under drought stress. 【Conclusion】 Expression profiles of different drought-stress times were constructed in order to establish dynamic expression profiles, by which the mutual mechanism between drought tolerance and soybean is entirely acquired, genes responding to drought stress were obtained and gene expression of drought tolerance is completely revealed.

    TILLAGE & CULTIVATION·PHYSIOLOGY & BIOCHEMISTRY·AGRICULTURE INFORMATION TECHNOLOGY
    Differences in Accumulation and Distribution and Use Efficiency of Nitrogen and Sulfur in Different Types of Winter Wheat
    WANG Dong,SANG Xiao-guang,ZHOU Jie,MAN Jian-guo,GU Shu-bo,WANG Jie,XIANG Chang-fen,LU Ying
    Scientia Agricultura Sinica. 2010, 43(22):  4587-4597 .  doi:10.3864/j.issn.0578-1752.2010.22.005
    Abstract ( 949 )   PDF (308KB) ( 556 )   Save
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    【Objective】 The objective of this study was to identify the differences in accumulation and distribution and use efficiency of nitrogen and sulfur in different types of wheat. 【Method】 A three-year field trial was conducted from 2006 to 2009 with total 13 cultivars for type classification in nitrogen use efficiency (NUE) and sulfur use efficiency (SUE) based on cluster analysis. Under the filed condition with 92.2 mg?kg-1 hydrolyzable N and 42.4 mg?kg-1 available S in 0-20cm soil layer, two N treatments (N24=24 kg N?hm-2, N240=240 kg N?hm-2) and two S treatments (S0=0 kg S?hm-2, N60=60 kg S?hm-2) were made. The contents of N and S, the accumulation amount of N and S, N harvest index and S harvest index, yield, and their relationship with NUE and SUE were analyzed. 【Result】 The results showed that NUE correlated positively with SUE. Based on the cluster analysis of NUE and SUE, these 13 cultivars could be divided into three groups: high NUE and SUE group (HNS group), medium NUE and SUE group (MNS group), and low NUE and SUE group (LNS group). The contents of N and S in LNS group were higher than those in MNS group and HNS group, N harvest index and S harvest index in LNS group were lower than those in MNS group and HNS group. With sulfur applied at N24 rate, N content, N accumulation amount, S accumulation amount and yield in HNS group and MNS group increased significantly, yield in LNS group decreased significantly, and the increasing rate of N accumulation amount in LNS group was lower than that in HNS group and MNS group, the decreasing rate of N harvest index in LNS group was higher than that in HNS group and MNS group. With sulfur applied at N240 rate, the contents of N and S, the accumulation amount of N and S increased significantly, NUE and SUE decreased significantly, but no significant difference occurred in N harvest index, S harvest index and yield in HNS group; no significant difference occurred in the accumulation amount of N and S of all tested cultivars, also in N harvest index and S harvest index of most tested cultivars, but the yield, NUE and SUE decreased in MNS group and LNS group. 【Conclusion】 The relative amount of sulfur demanded for yield formation is consistent with that of nitrogen. NUE and SUE could be coordinately developed. It is an important way for utilizing N and S more efficiently to produce higher grain yield with suitable N content and S content, certain N accumulation amount and S accumulation amount, higher N harvest index and S harvest index.

    Modeling and Analyzing the Relationship Between Soil Structure and Wheat Seedling Root with Pro/E
    HAN Qiu-ping,DING Qi-shuo,PAN Gen-xing,DING Wei-min,ZHOU Yu-hui
    Scientia Agricultura Sinica. 2010, 43(22):  4598-4604 .  doi:10.3864/j.issn.0578-1752.2010.22.006
    Abstract ( 778 )   PDF (363KB) ( 654 )   Save
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    【Objective】 A 3D modeling technique was investigated for both topological reconstruction of crop root and the computation of relative criteria of the crop root and soil structures and their correlations. So that a general-purpose technical approach was provided for the modeling and analyzing the demand in the soil-root system studies. 【Method】 The measured wheat root data was reconstructed into 3D models in Pro/E platform, then the calculation of related criteria to quantify wheat root and soil structure was performed. The result was then used to quantify the dynamical change of the root-soil system for different tillage treatments including no-tillage and rotary-tillage. 【Result】 In each monitoring period total wheat root length in no-tillage was longer than that in rotary-tillage. Whereas the horizontal angle of the no-tillage treated wheat root was higher than that of the rotary-tillage in the first 28 days after sowing. During the following 42-70 days the two angles turned into the same level. Root-axis-expanded soil volume from no-tillage was always larger than that in rotary-tillage. This trend was also true for enveloping soil volumes and effective soil volumes for unit root lengths. In the first 56 d period the enveloping soil volumes and the effective soil volumes for unit root lengths exhibited a positive increasing trend, but then were drastically decreased in 56-70 days. 【Conclusion】 Pro/E platform provides powerful functions for 3-D root-soil system modeling and calculating and analyzing. Root length, root-axis-expanded soil volume, enveloping soil volumes and effective soil volumes for unit root lengths are suitable indices for root-soil system quantification. They can be used for monitoring and evaluating tillage-induced soil structure and the dynamics of the soil structure and root interrelationship, which is beneficial to mechanism interpretation of soil tillage and crop establishment.

    Effect of Plant Physiological Age on Biomass and Nitrogen Accumulation in Cotton Boll
    ZHAO Xin-hua,WANG You-hua,SHU Hong-mei,ZHOU Zhi-guo
    Scientia Agricultura Sinica. 2010, 43(22):  4605-4613 .  doi:10.3864/j.issn.0578-1752.2010.22.007
    Abstract ( 1044 )   PDF (346KB) ( 489 )   Save
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    【Objective】 To study the effect of plant physiological age on biomass and nitrogen accumulation in cotton bolls and their relationship with boll quality. 【Method】 The experiments were carried out in Xuzhou (117°11′E, 34°15′N) and Anyang (114°13′E, 36°04′N) with two cotton cultivars Kemian 1 and NuCOTN as materials. The biomass and nitrogen accumulation of cotton bolls were studied with different fruiting positions under the same temperature conditions by setting different sowing dates (25th April and 25th May). 【Result】 Under younger plant physiological age conditions (bolls developed on lower positional fruiting-branches), the start time, the rate and the duration of the rapid biomass and nitrogen accumulation period was earlier, higher and longer than that under higher plant physiological age conditions (bolls developed on middle positional fruiting-branches), respectively, while the total biomass and nitrogen accumulation of the bolls with different plant physiological conditions were not different. Consequently, except that the fiber strength developed in the middle positions was higher than that in lower positions, other fiber qualities (fiber length and micronaire) and cotton seed qualities (the gross protein content and gross oil content) were not different. 【Conclusion】 These results suggested that the variation of plant physiological age seemed not to change the total biomass and nitrogen accumulation in cotton bolls, but may change the process of them. Fiber strength might be the most sensitive fiber character to the variation of plant physiological age. And higher fiber strength in the middle positions than that in lower positions might be mainly due to its more tempered biomass and nitrogen accumulation progress.

    PLANT PROTECTION

    Cloning, Expression and Application of β-1,3-1,4-glucanase Gene from Paenibaccillus polymyxa CP7

    WEN Feng-yun,LIAO Fu-pin,LIN Jian-rong,ZHONG Yang-sheng
    Scientia Agricultura Sinica. 2010, 43(22):  4614-4623 .  doi:10.3864/j.issn.0578-1752.2010.22.008
    Abstract ( 846 )   PDF (881KB) ( 1197 )   Save
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    【Objective】This study was carried out to obtain high-yielding β-1,3-1,4-glucanases gene engineering strain from Paenibacillus polymyxa CP7 for the research of anti-fungi components, and provide a theoretical basis and application in agricultural production for β-1,3-1,4-glucanases.【Method】After cloning and expression of the β-1,3-1,4-glucanases gene in Escherichia. coli strain BL-21, the inhibitory effects of recombinant protein on the tested fungus were detected, and the effect of recombinant β-1,3-1,4-glucanase on animal feed digestibility in vitro using wheat as raw material of feed was studied.【Result】The bioassay results reveal that the recombinant β-1,3-1,4-glucanase has strong inhibitory effects on the testing fungus with different activities between them, and the inhibitory ratio reached up to 40% above. Compared with the control, the viscosity of wheat sample treated with the recombinant protein was reduced by 4.69% (P>0.05). 【Conclusion】 β-1,3-1,4-glucanase is or one of the effective components of active compounds, restrains the fungus of Paenibacillus polymyxa CP7 crude extracts, which suggest β-1,3-1,4- glucanase can be used as a new kind of agricultural chemicals for development, meanwhile, it is also a prosperous feedstuff additive.

    The Operon, Structure and Biological Activities of the Lipopeptide Bacillomycin L Produced by Bacillus subtilis Bs916
    LUO Chu-ping,WANG Xiao-yu,CHEN Zhi-yi,LIU Yong-feng,ZHANG Jie,LIU You-zhou,NIE Ya-feng,YU Jun-jie,YIN Xiao-le
    Scientia Agricultura Sinica. 2010, 43(22):  4624-4634 .  doi:10.3864/j.issn.0578-1752.2010.22.009
    Abstract ( 1234 )   PDF (868KB) ( 2208 )   Save
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    【Objective】The aim of this study is to clone and sequence the Bac operon responsible for synthesis of the bacillomycin L from Bacillus subtilis Bs916 and determine the structure and biological activities of the bacillomycin L. 【Method】 LA-PCR and gene walking were performed to clone the Bac operon responsible for synthesis of bacillomycin L. Analysis of the Bac operon genetic structure was made using bioinformatics. The molecular weight of the bacillomycin L homologues was determined by matrix-assisted laser desorption ionization-time of flight mass spectrometry (MS). ESI/MS-CID was used to determine the bacillomycin L peptide moiety primary structure. 【Result】 The 39.0 kb Bac operon responsible for synthesis of bacillomycin L was identified and cloned from Bacillus subtilis Bs-916. The operon contained a promoter and four ORFs and the four ORFs designated BacD, BacA, BacB, and BacC, respectively. Although the amino acid sequences encoded by the Bac operon share high similarity with the countpart amino acid sequences encoded by itu, myc and bam operons, a low similarity region was also found and it presumed to be a novel Ser activation domain. According to the Bac sequence, the lipoepeptide presumed to belong to bacillomycin L. The molecular weights of the bacillomycin L were 1 008,1 022,1 036 and 1 050 Da. They were presumed to belong to homologues differed by a structure of -CH2. The bacillomycin L peptide moiety primary structure was [cyclo-(Asn-Tyr-Asn-Ser-Glu-Ser-Thr-β-amino fatty acid)] and it is the same as the peptide sequence of bacillomycin L reported previously. In vitro tests to pathogenic fungi indicated that bacillomycin L have a broad antifungal activities and hemolytic activities.【Conclusion】This paper reported the cloning, sequencing and characterization of a whole operon Bac which is responsible for synthesis of bacillomycin L. Through bio-information and chemical analysis, the authors also further confirmed the primary structure of bacillomycin L which has paradox reported before. The bacillomycin L synthesized by Bac has a broad antifungal activities and plays crucial part in Bs-916 bio-control activities.

    Isolation and Identification of Deoxynivalenol Degradation Strains
    XU Jian-hong,JI Fang,WANG Hong-jie,WANG Jian-wei,LIN Fan-yun,SHI Jian-rong
    Scientia Agricultura Sinica. 2010, 43(22):  4635-4641 .  doi:10.3864/j.issn.0578-1752.2010.22.010
    Abstract ( 856 )   PDF (387KB) ( 942 )   Save
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    【Objective】 The aim of this study was mainly to find bacteria to degrade deoxynivalenol (DON) and realize the application of biodetoxification of DON.【Method】 Wheat was inoculated with a high-yielding strain F. graminearum F-25 for the production of DON, and using DON as the only carbon source for enrichment and isolation of the mixed culture, then screening for the strains which can degrade DON. 【Result】The strain DDS-1 was screened out from 1 000 strains, the degradation ratio of DON reached more than 95%, which was obviously higher than others.According to its morphological, physiological, and biochemical characteristics and 16S rDNA gene sequence,the strain DDS-1 was finally identified as Devosia sp.. After DDS-1 was added to the feedstuff, the toxin in the feed can be degraded by 75.47%. 【Conclusion】The strain DDS-1 that can degrade DON was identified preliminarily as Devosia sp. DDS-1 can not only degrade DON in liquid medium, but also degrade DON in feedstuff. The strain of Devosia sp. can degrade DON, thus supplying a feasible solution for biodetoxification of DON.

    SOIL & FERTILIZER·WATER-SAVING IRRIGATION·AGROECOLOGY & ENVIRONMENT
    The Effects of Various Organic Matters on the Nitrogen Nutrition of Flue-Cured Tobacco and Its Quality by 15N
    LIU Qing-li ,SHI Jun-xiong,ZHANG Yun-gui ,WANG Jing-jun,LI Zhi-hong
    Scientia Agricultura Sinica. 2010, 43(22):  4642-4651 .  doi:10.3864/j.issn.0578-1752.2010.22.011
    Abstract ( 800 )   PDF (441KB) ( 780 )   Save
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    【Objective】 The objective of this study is to understand the dynamics of nitrogen from organic matter during the tobacco growing process and its contribution of organic fertilizer nitrogen to nitrogen nutrition of flue-cured tobacco and to provide a basis for rational fertilization of the flue-cured tobacco. 【Method】 The rapeseed fertilizer, rice straw and rape straw were studied by 15N tracer.【Result】 The nitrogen utilization efficiency of rapeseed cake, rice straw and rape straw were 19.5%, 15.5% and 8.1%, respectively, and the inorganic fertilizer nitrogen utilization efficiency were 41.1%, 42.7% and 35.7% under combined application of organic additives and inorganic nitrogen fertilizer. The contribution rate of rapeseed cake, rice straw, rape straw to accumulated nitrogen of flue-cured tobacco were 1.0%, 2.4% and 2.7%, respectively, by the combined application of organic additives and nitrogen fertilizer. The contribution proportion of rapeseed cake, rice straw and rape straw after top pruning was 4.4%,20.8%, and 18.9% to accumulated nitrogen of flue-cured tobacco, respectively. 【Conclusion】 The results demonstrate that the contribution of rapeseed cake, rice straw and rape straw to nitrogen nutrition of flue-cured tobacco is very low and the absorption of flue-cured tobacco for organic nitrogen accord with the nitrogen needs laws of high-quality tobacco. It also indicates that the combined application of organic additives and inorganic nitrogen fertilizer reduced the nicotine content of tobacco, increased the sugar/nicotine ratio and improved the quality of tobacco. The role of rice and rape straw is greater than the rapeseed cake, which can be used as measures to decrease nicotine content.

    Research on Dynamic Change of Soil Erosion Distribution and Its Controlling Factors in Yimeng Mountainous Area of China
    MA Qian,YU Xing-xiu,LIU Qian-jin,Lü Guo-an
    Scientia Agricultura Sinica. 2010, 43(22):  4652-4662 .  doi:10.3864/j.issn.0578-1752.2010.22.012
    Abstract ( 803 )   PDF (668KB) ( 557 )   Save
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    【Objective】The aim of this study is to provide some references for the rule of soil erosion and the control of soil loss in Yimeng Mountainous area by analysing the dynamic change relationship of soil erosion intensity distribution relevant to slope gradient, soil types, rainfall, vegetation cover and land use.【Method】Supported by the technology of GIS&RS, data of slope gradient, soil erodibility and data of annual rainfall erosivity, vegetation cover, land use and soil erosion intensity in different years (1986, 1995 and 2005) in the study area were acquired from Landsat TM image, relief map, soil map and meteorological information. Then, the hilly and mountain region of the study area was divided into 122 subbasins in which the soil erosion intensity index (SEI), average slope (AS), soil erodibility index (KI), average annual rainfall erosivity (AR), average vegetation fraction (AVF) and land use structure characteristic index (SI) were used to study the dynamic change relationship between soil erosion intensity distribution and the above factors at subbasin scale by the method of statistical analysis. 【Result】The investigation showed that with the increase of vegetation cover, the change of land use structure tended to be favorable for controlling soil erosion, the soil erosion intensity in the hilly and mountain region in the years of 1986, 1995 and 2005 presented a obvious decline. The effect of soil factors on the distribution of soil erosion intensity of the three years was not significant. The annual rainfall erosivity significantly influenced the distribution of erosion intensity in 2005 with a lower contribution rate (CR), which was 5.35%. Slope was the most critical factor affecting the distribution of erosion intensity, but the CR fell from 92.82% in 1986 to 84.23% in 2005. Vegetation cover only effected in 1986 with a CR of 7.18%, while the effect of land use which is closely related to human activities had been gradually enhanced, and the CR reached 15.77% in 2005. 【Conclusion】 When the space difference in distribution of annual rainfall erosivity increased, rainfall will be a factor which significantly influence the distribution of erosion intensity. Affected by human activity, land use exhibited its noteworthy factor on the erosion distribution after the restoration of vegetation. It is suggested that adjustment and optimization of land use structure should still be made in this area for the control of soil erosion.

    HORTICULTURE
    Molecular Verification of DNA Flow from Wild Sour Cucumber to Cultivated Cucumber
    SHI Jian-lei,CHEN Jin-feng,LOU Qun-feng,SUI Yi-hu,WU Zhi-ming,ZHANG Shu-xia
    Scientia Agricultura Sinica. 2010, 43(22):  4663-4670 .  doi:10.3864/j.issn.0578-1752.2010.22.013
    Abstract ( 758 )   PDF (649KB) ( 378 )   Save
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    【Objective】 Introgression lines were researched by molecular markers and the phenotypic identification in order to proof DNA flow from wild sour cucumber to cultivated cucumber, which were obtained by interspecific hybridization between the cultivated cucumber (Cucumis sativus L., 2n=14) and wild sour cucumber (Cucumis hystrix Chakr., 2n=24), and multiple generational backcrossing and selfing followed. 【Method】 Molecular markers, DNA sequences and agronomic traits were used in the study to analyze and contrast introgression lines and their parents. 【Result】 The results showed that the genetic polymorphism between introgression lines and cultivated cucumber was 13.2%, including donor specific bands, missing bands and new bands. The sour cucumber specific bands in introgression lines were obtained by RAPD primer D-11 and SSR primer 06632, with the size of 310 bp and 150 bp respectively. Sequence analysis showed that the identity was 92.93% and 96.48%, respectively, though there were 41 and 9 different base pairs, respectively, including the base pairs transition, transversion and deletion. And the genetic characteristics of sour cucumber were found in introgression lines. 【Conclusion】 These results confirmed that a few mutations of different types occurred with DNA segments of wild sour cucumber being introgressed into cultivated cucumber.

    Effect of Application of Biogas Slurry with Potassium on Orchard Soil Properties and Soil Microorganism and Fruit Quality
    LI Bing-zhi,WANG Gui-fang,QIN Xiao-fei,ZHANG Lin-sen,HAN Ming-yu,ZHANG Li
    Scientia Agricultura Sinica. 2010, 43(22):  4671-4677 .  doi:10.3864/j.issn.0578-1752.2010.22.014
    Abstract ( 811 )   PDF (372KB) ( 950 )   Save
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    【Objective】 The present experiment is aiming at studying how the coordination use of biogas slurry and potassium in apple orchard influences the physiochemical characteristics of its soil, the quantity of microorganisms in its soil, and its fruit quality, and thus providing a theoretical basis for properly use of biogas slurry in Weibei Rainfed Highland of Shaanxi. 【Method】The 10-year-old apple trees were used as test materials in the experiment and the effects of combined use of biogas slurry and potassium in apple orchard on the physiochemical characteristics of soil, the quantity of microorganisms in soil, and fruit quality were studied to screen the application rate of biogas slurry alone and the biogas slurry together with potassium. 【Result】 The results showed that biogas slurry dressing decreased soil bulk density and increased soil porosity, available nitrogen, and available potassium. Biogas slurry at 100 kg/tree decreased soil bulk density by 10.6% and increased soil porosity by 7.6% compared with the control. Biogas slurry at 50 kg/tree with potassium at 1 kg increased soil potassium by 20.5% compared with the control. Biogas slurry applied with potassium increased the number of soil bacteria, fungi, and antinomies. Biogas slurry applied at 100 kg increased the numbers of bacteria,fungi and actinomycetes by 132.7%, 38.3%, and 58.2% compared with the control. There was a promoting effect of combined application of biogas slurry with potassium on apple red fruit surface area rate, average single fruit weight, firmness, soluble solids and anthocyanin. Biogas slurry applied at 50 kg/tree and potassium applied at 0.5kg/tree increased anthocyanidin by 48%, colored area increased by 29.9% compared with the control. 【Conclusion】 The study proposed that biogas slurry applied at 100 kg per plant and biogas slurry applied at 50 kg with K fertilizer 0.5 kg per plant were the best for apple production and should be popularized.

    Identification and Genetic Diversity of Hybrid Progenies from Shatian Pummelo by SSR
    HAN Guo-hui,XIANG Su-qiong,WANG Wei-xing,WEI Xu,HE Bo,LI Xiao-lin,LIANG Guo-lu
    Scientia Agricultura Sinica. 2010, 43(22):  4678-4686 .  doi:10.3864/j.issn.0578-1752.2010.22.015
    Abstract ( 814 )   PDF (552KB) ( 870 )   Save
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    【Objective】 SSR markers were used to identify and study the genetic diversity of hybrid progenies from crosses of Shatian pummelo as female, which can provide technical and materials’ support and a theoretical basis for innovating germplasm and genetic improvement of citrus. 【Method】 The hybrid nature of 159 offsprings from the two cross combinations of Shatian pummelo was analyzed, and the genetic relationship between parents and offsprings was analyzed with UPGMA. 【Result】 One hundred and three hybrids was identified from 104 F1 seedlings of ‘Shatianyou’ × ‘Chandler’ pummelo by 4 pairs SSR primers, the identification rate was 99.04%, and 70 progenies had non-parent markers in primer AGC9. All the offsprings from ‘Shatianyou’בHongjiangcheng’ were proved to be hybrids with 5 pairs SSR primers, one homozygous maker AAT12 was obtained, and some markers were absent in 55 F1 seedlings in primer GA18 and AGC9. The cluster analysis of SSR data indicated that the genetic variation of hybrids from the two cross combinations was obviously, and the genetic diversity between the two combinations of crosses was obviously different.【Conclusion】 The identification of hybrids and genetic diversity of citrus can be assessed efficiently by SSR markers, and the cross breeding is an effective way to obtain variant strains.

    STORAGE·FRESH-KEEPING·PROCESSING
    Effect of Ultrasonic on the Structure of Wheat Gluten Protein

    ZHANG Hai-hua,ZHU Ke-xue,ZHOU Hui-ming

    Scientia Agricultura Sinica. 2010, 43(22):  4687-4693 .  doi:10.3864/j.issn.0578-1752.2010.22.016
    Abstract ( 826 )   PDF (540KB) ( 1095 )   Save
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    【Objective】 The information on the gluten protein structure alterations affected by ultrasonic would provide a theoretical basis for the changes of functional properties under ultrasonic. 【Method】 The secondary structure, inner/intra molecules interaction as well as micro structure of gluten after ultrasonic treatment were studied by using FTIR, SEM and laser particle mastersier 2000. 【Result】 The β-turn percentage of gluten protein significantly decreased while the α-helix percentage increased after ultrasonic under all power levels, but the β-sheet percentage altered as the ultrasonic power level differed. In addition, the SS bond, hydrogen bond and hydrophobic bond among inter/intra molecules were destroyed, which resulted in the formation of incompact structure shown by SEM and indicated by the increase of volume particle size of gluten protein. 【Conclusion】 Ultrasonic reduced the inner/intra molecules interaction among gluten molecules, whereby the incompact structure formed.

    Effect of Chitosan/nano-SiOx Complex on Quality and Physiology of Fresh-Cut Bamboo Shoot
    LUO Zi-sheng,ZHANG Li
    Scientia Agricultura Sinica. 2010, 43(22):  4694-4700 .  doi:10.3864/j.issn.0578-1752.2010.22.017
    Abstract ( 744 )   PDF (316KB) ( 788 )   Save
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    【Objective】 The effect of chitosan/nano-SiOx complex coating on shoot of bamboo (Phyllostachys vivax Mcclure. cv. Huapuj) was studied. 【Method】 Fresh-cut bamboo shoots were stored at (4±1)℃ for 8 days, and the effect of 1% chitosan/nano-SiOx coating on quality and physiology of fresh-cut bamboo shoots were then investigated. 【Result】 The results indicated that the respiration rate and ethylene production rate decreased while the activities of phenylalanine ammonia lyase (PAL), polyphenol oxidase (PPO) and peroxidase (POD) increased quickly and the accumulation of total phenolic compounds enhanced, thereby promoting the lightness (L) decrease and browning index (BI) increase. Chitosan/nano-SiOx complex coating not only reduced the respiratory rate and ethylene production rate, but also delayed the increase of activities of PAL, PPO and POD, maintained high L value and low level of BI. 【Conclusion】 Chitosan/nano-SiOx complex coating exhibits potential use for storage of fresh-cut bamboo shoots.

    Application of Ribosomal RNA Gene for Taxonomical Classification of Yeasts

    LIU Ning,LIU Yan-lin
    Scientia Agricultura Sinica. 2010, 43(22):  4701-4708 .  doi:10.3864/j.issn.0578-1752.2010.22.018
    Abstract ( 957 )   PDF (304KB) ( 1606 )   Save
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    Ribosomal DNA plays an important role in classification and identification of yeasts. Composition of ribosome, principles of the molecular markers covering 26S rDNA D1-D2 domain, 18S rDNA,ITS-5.8S rDNA and IGS rDNA regions and their application in yeast taxonomy are elucidated in this review. Furthermore, the problems and trends of rRNA gene for taxonomical classification are also discussed.

    ANIMAL SCIENCE·RESOURCE INSECT
    Difference of SNRPN Methylation Status and Its mRNA Expression in Testes Between Cattle-Yaks and Their Parents
    PAN Zeng-xiang,LIU Zhen-shan,LI Yin-xia,YU Sha-li,LI Ming-gui,XIE Zhuang,LI Qi-fa
    Scientia Agricultura Sinica. 2010, 43(22):  4709-4716 .  doi:10.3864/j.issn.0578-1752.2010.22.019
    Abstract ( 753 )   PDF (1053KB) ( 1070 )   Save
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    【Objective】 In order to reveal the apparent genetic mechanism of cattle-yaks about male sterile, DMR of SNRPN methylation status and its mRNA expression in testes between cattle-yaks and their parents were studied. 【Method】 The 5′-flanking sequence of SNRPN in yak was cloned and sequenced by the primers which designed on the basis of sequence of cattle SNRPN DNA. In cattle-yaks and their parents’ testes, the methylation status of SNRPN 5′-flanking was detected using sodium bisulfite sequencing and the SNRPN mRNA expression levels were also detected by Real-time PCR. 【Result】 The 5′-flanking sequence of SNRPN (1 137 bp) in yak was obtained, which the homology between yaks and cattle was 98.2%, and bioinformatics analysis suggested that the region contains the putative methylation-sensitive binding sites YY1 and SP1. The results showed that the methylation level of SNRPN gene in cattle-yaks (42.22%) was very significantly greater than that in cattle (21.08%) and yaks (20.81%) (P<0.01). The SNRPN expression level of cattle-yaks was lower than that of their parents in testes, but there was no significant difference (P>0.05). 【Conclusion】 The testicular methylation level of SNRPN gene in cattle-yaks was very significantly greater than that in cattle and yaks, the testicular SNRPN expression level of cattle-yaks was lower than that of their parents, indicating that the SNRPN gene maybe arrest meiotic process of spermatogenesis by its mRNA expression inhibition through the high methylation level of SNRPN gene DMR in cattle-yaks.

    Genetic Polymorphism of DGAT1 Gene Association with Lactation Traits in Laoshan Dairy Goat
    WANG Gui-zhi,LI Cheng-bo,QIN Zi-juan,WANG Jian-min,GE Xin,ZHAO Jin-shan,LI Pei-pei,WANG Jian-hua
    Scientia Agricultura Sinica. 2010, 43(22):  4717-4724 .  doi:10.3864/j.issn.0578-1752.2010.22.020
    Abstract ( 803 )   PDF (570KB) ( 554 )   Save
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    【Objective】 The present study was aimed to research the association of DGAT1 candidate gene with milk raits in Laoshan dairy goat. 【Method】 Diacylglycerol acyltransferase 1 (DGAT1) is a microsomal enzyme that catalyzes the final and only committed step in the synthesis of triglycerides. PCR-single strand conformation polymorphism (PCR-SSCP) assay was used to diagnose polymorphisms of DGAT1-P1(including exon 5), DGAT1-P2 (containing 5′ control region) and DGAT1-P4 loci in dairy goat populations (containing 175 individuals). Polymorphism of DGAT1-P3 locus was analyzed by direct sequencing of candidate gene, and least square method was performed to evaluate the association of DGAT1-P4 site with milk traits. 【Result】 No polymorphism was found in DGAT1-P1 and DGAT1-P2 sites. A mutation from A to G at 600 bp of DGAT1-P3 was found by means of comparative between DNAs in high fat rate and low fat rate goats. One A→G single nucleotide polymorphism was identified at DAGT1-P4 site, which had a significant effect on the fat rate (P<0.01), and the genotype AA was the most favorable one, the alleles A had a positive effect on fat rate. 【Conclusion】 Results from this study show that the candidate gene DGAT1 has a diversity in Laoshan dairy goat and a significant effect on milk fat rate trait, so they could provide valuable genetic markers for marker-assisted selection of Laoshan dairy goat.

    Isolation, Culture, Identification and Muscle Differentiation of Skeletal Muscle Satellite Cells in Beijing Fatty Chicken
    LI Fang-hua,HOU Ling-ling,MA Yue-hui,PANG Quan-hai,GUAN Wei-jun
    Scientia Agricultura Sinica. 2010, 43(22):  4725-4731 .  doi:10.3864/j.issn.0578-1752.2010.22.021
    Abstract ( 798 )   PDF (475KB) ( 654 )   Save
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    【Objective】 This research was aimed to explore a protocol of isolation, culture and identification of skeletal satellite cells, and to establish an optimal in vitro amplification system for Beijing Fatty chicken skeletal muscle satellite cells, thereby laying a technical foundation for future pertinent researches. 【Method】 Pectoral muscles were isolated from 15-day-old chicken embryos, disassociated with collagenase and trypsin and purified via differential adhesion. Satellite cells were detected for the expression of Pax7, Myod and Desmin and induced to muscle. Proliferative capacities in three different culture systems were compared as well. 【Result】 The cultured cells expressed Pax7 and MyoD in nucleus and desmin in cytoplasm, demonstrating that they were indeed Beijing Fatty chicken skeletal muscle satellite cells. Satellite cells underwent muscle differentiation and formed multinucleated myotubes. Muscle differentiation markers MHC in cytoplasm were detected in these cells. And it represented an optimal system for Beijing Fatty chicken skeletal muscle satellite cells to be cultured in media containing DMEM/F12+ 15%FBS+2.5ng?mL-1 basic fibroblast growth factor (bFGF). 【Conclusion】 The present study successfully isolated and identified the skeletal muscle satellite cells in Beijing Fatty chicken and established their optimal in vitro culture system. Satellite cells were also successfully induced to differentiate into muscle , and, accordingly, provided a theoretical and technical basis for studying the mechanism of skeletal muscle growth and development in future.

    VETERINARY SCIENCE
    Effects of MicroRNA -24 on Bovine Mammary Epithelial Cells Proliferation and Apoptosis at High Temperature
    LI Hui-xia,WANG Zhen-yun,ZHANG Zhen,ZHOU Xuan,WANG Xiang-chen,HAN Zhao-yu,WANG Gen-lin
    Scientia Agricultura Sinica. 2010, 43(22):  4732-4738 .  doi:10.3864/j.issn.0578-1752.2010.22.022
    Abstract ( 1072 )   PDF (380KB) ( 631 )   Save
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    【Objective】 MicroRNA (miRNA) is a kind of short non-coding RNA about 22-23 nucleotides in length. The present study was performed to investigate the effects and molecule mechanism of miRNA -24 on mammary epithelial cells growth and apoptosis in response to high temperature. 【Method】 Bovine mammary epithelial cells were cultured in vitro, and gene silencing techniques were used to inhibit the expression of miRNA-24 in mammary epithelial cells which in response to heat stress. Cell proliferation was measured by cell count method. Apoptosis of cells was analyzed by Hoechst33342/PI fluorescent staining and FCM. The expression of apoptosis correlation factors caspases-8 and caspases-3 were detected by western blot. 【Results】 The results showed that miRNA-24 gene silencing in mammary epithelial cells significantly increased (P<0.05) the proliferation of cells although these cells were treated at high temperature beforehand. In contrast, the apoptosis of these cells were decreased (P<0.05), the expression of caspases-8 and caspases-3 were also decreased after miRNA-24 gene silencing. 【Conclusion】 miRNA-24 have important roles in regulation of glandular tissue development, inhibition of miRNA-24 may rescue heat stress-induced apoptosis of bovine mammary epithelial cells and promote the cells growth and development.

    Advance in Capsid Proteins and Assembly of Herpesvirus
    XIANG Jun,CHENG An-chun,WANG Ming-shu
    Scientia Agricultura Sinica. 2010, 43(22):  4739-4745 .  doi:10.3864/j.issn.0578-1752.2010.22.023
    Abstract ( 680 )   PDF (282KB) ( 1564 )   Save
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    The capsid of herpesvirus is composed of a major capsid protein called VP5 and three less abundant proteins, VP19C, VP23 and VP26. VP5 is the structural subunit of all 162 capsomers while VP19C and VP23 are located in the space between the capsomers. In addition to the structural proteins, capsid assembly involves participation of the protease and the scaffolding protein,preVP22a. Applying of cryoelectron microscopy and recombinant baculoviruses techniques have made considerable advances in understanding the capsid shell.The former has been allowed for a detailed analysis of the structure of the capsid. And the latter has been developed which has aided in de?ning the assembly pathway by identifying intermediates in the assembly of intact capsids. This review is a summary of our present knowledge with respect to the capsid protein and assembly of the herpesvirus capsid.

    RESEARCH NOTES

    A Proteomic Approach to Study Defense-Related Proteins Responses to GSH Treatment in Pea (Pisum sativum)

    LIU Hong-xia,ZHAO Xin,BI Yang,ZHANG Zeng-yan,CHEN Bai-hong,AN Cheng-cai
    Scientia Agricultura Sinica. 2010, 43(22):  4746-4753 .  doi:10.3864/j.issn.0578-1752.2010.22.024
    Abstract ( 990 )   PDF (783KB) ( 682 )   Save
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    【Objective】 This study was conducted to isolate and identify the defense-related proteins in pea albino seedlings in response to GSH treatment, and to clarify the disease-resistant mechanism of these proteins involved in pea disease response. 【Method】 The method of proteomic analysis was used in the study. Four kinds of defense-related proteins closely related to pea disease response were successfully isolated from pea albino seedlings treated with 50 mmol?L-1 reduced glutathione (GSH) after 48 h of treatment. After the identification with MALDI-TOF MS, a pathogenesis-related protein PR10 (PI49), two ABA responsive proteins ABR17 and ABR18, and a glycine-rich RNA binding protein (GRPs) were identified. The possible roles of these four proteins in the disease response of pea seedlings to GSH treatment were discussed. 【Result】 Results showed that ABR17 and PI49 emerged concomitantly, indicating a potential cooperative effects of these two proteins in pea disease response to enhanced disease-resistance of pea. 【Conclusion】 Under GSH treatment, PR and ABA responsive proteins were the main anti-fungal proteins at 48 h after treatment, indicating that these two proteins would play pivotal roles in pea disease response to pathogen attacks.

    Effects of Combination of Biocontrol Bacteria Complex with Salt Stress-Relieving Strain on Promotion of Cotton Growth
    ZHAO Ya-feng,TAO Jing,WU Zhan-sheng,LIU Yan,LI Chun
    Scientia Agricultura Sinica. 2010, 43(22):  4754-4760 .  doi:10.3864/j.issn.0578-1752.2010.22.025
    Abstract ( 955 )   PDF (262KB) ( 847 )   Save
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    【Objective】 Effects of multi-functional bacterial mixture BCL-Rs on promotion of cotton growth under salt stress and Rhizoctonia solani damping-off were studied. 【Method】 BCL-Rs were obtained by combining biocontrol bacteria complex BCL-8 with salt stress-relieving strain Klebsiella oxytoca Rs-5. The function of BCL-Rs on cotton growth was investigated in pot tests, plot experiments and field trials. 【Result】 The BCL-Rs had an obvious inhibitory activity to Rhizoctonia solani, and BCL-Rs-treated cottons showed a good performance of relieving salt stress, and significant resistance to damping-off caused by Rhizoctonia solani. Compared with the control, the control efficacy of damping-off on cotton reached up to 55.37% and 51.06% in pot and plot experiments, respectively. And the dry weight of cotton seedlings increased by 40.85% and 25.81% under the salt stress conditions, respectively. The results of cotton field trials showed that the growth of cotton seedlings was promoted by coating and drip irrigation with BCL-Rs. Physiological characters of cotton, including plant fresh weight, dry weight, plant height, and leaf area increased significantly. The production of cotton increased by 10.51% compared with the conventional treatment. 【Conclusion】Cotton damping-off caused by Rhizoctonia solani was significantly suppressed by the bacterial mixture BCL-Rs even under the salt stress conditions, indicating a synergistic effect of biocontrol bacteria BCL-8 and salt stress-relieving strain Rs-5.

    Effects of Branch Bending on Growth of New Shoots and the Dynamic Changes of Endogenous Hormones in Apple
    WANG Lei,JIANG Yuan-mao,PENG Fu-tian,WEI Shao-chong,GE Shun-feng,FANG Xiang-ji
    Scientia Agricultura Sinica. 2010, 43(22):  4761-4764 .  doi:10.3864/j.issn.0578-1752.2010.22.026
    Abstract ( 970 )   PDF (241KB) ( 552 )   Save
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    【Objective】 The aim of the experiment is to provide a theoretical basis for the extension of the branch bending technology in apple production. 【Method】Three-year-old apple trees (Malus domestica Borkh. cv Red Fuji)/Malus hupehensis grown in a pot were used in the present study to explore the effects of branch bending on growth of new shoots and the dynamic changes of endogenous hormones. 【Result】 The results were as follows: The level of endogenous ABA in shoot tip was positively conrrelated with branch bending, that of branch horizontal and branch drooping were 17.5% and 29.2% more than that of contorl at the first priord, but the level of GAs and IAA decreased significantly,and that of ZRs decreased unconspicuously. The level of endogenous ABA in fine roots of branch bending was significantly higher than that of contorl, whereas the level of GAs and IAA decreased in different extents, the change of the level of ZRs showed no significant difference. The ratio of (IAA+ GAs +ZRs)/ABA in shoot tip and fine roots decreased significantly along with the increase of branch bending angle, the values in shoot tip of contorl, branch horizontal and branch drooping were 2.11,1.61, and 1.36 respectively, at autumn shoot growing stage. 【Conclusion】 The level of endogenous IAA and GAs as well as the ratio of (IAA+ GAs +ZRs)/ABA decreased significantly after branch drooping.