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Testing Taylor’s Power Law association of maize interplant variation with mean grain yield
Chrysanthi PANKOU, Louloudia KOULYMBOUDI, Fokion PAPATHANASIOU, Fotakis GEKAS, Ioannis PAPADOPOULOS, Evaggelia SINAPIDOU, Ioannis S. TOKATLIDIS
2022, 21 (12): 3569-3577.   DOI: 10.1016/j.jia.2022.08.103
Abstract140)      PDF in ScienceDirect      

Plant-to-plant variability is a crop stability component.  The objective of this study in maize (Zea mays L.) was to test the validity of the theoretical background of the hypothesis that the coefficient of variation (CV) for grain yield per plant and mean yield are connected exponentially, following the Taylor’s Power Law (TPL) Model.  Field experimentation was conducted across two sites, two seasons, and two planting densities.  Densities were the main plots, corresponding to the typical practice of 8.89 plants m–2 (TCD) and the low-input optimal of 5.33 plants m–2 (LCD), while hybrids were the subplots.  Data from 26 subplots in the first site averaged CV values of 22.6% at the TCD and 21.9% at the LCD, and mean yields of 19.1 and 13.9 t ha–1, respectively, following the TPL Model.  The same was true for the second site, with average CVs and means of 41.5% and 14.3 t ha–1 at the TCD and 36.8% and 11.5 t ha–1 at the LCD.  A test was performed on the simple correlation between the logarithms of variances and their respective means to investigate whether there is a systematic variance dependence on mean, thus questioning the reliability of TPL.  The validity of TPL was verified in the first site.  Nevertheless, there was a systematic dependence of yield variance on mean yield in the second site, implying that the CV-yield correlation might be not biologically meaningful.  Conversion of the variance to remove its dependence on the mean did not validate the CV-yield negative relationship, meaning that caution is needed when interpreting the CV as a stability index for intra-crop variation.  Whether the determinant factor of invalidity of TPL was the extensive intra-crop variation in the lower yielding second site can be assessed in future research.

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Impacts of soil fertility management on productivity and economics of rice and fodder intercropping systems under rainfed conditions in Odisha, India
Dilip Kumar BASTIA, Subrat Kumar BEHERA, Manas Ranjan PANDA
2021, 20 (12): 3114-3126.   DOI: 10.1016/S2095-3119(20)63591-2
Abstract175)      PDF in ScienceDirect      
Under small and marginal farm conditions, allocation of land exclusively for forages is not possible.  Hence, integration of forages in existing crop geometry can ensure production of grain and fodder, simultaneously under rainfed conditions.  A field experiment was conducted to study the effect of different nutrient management practices on rice and fodder intercropping systems under rainfed conditions during 2015–2017.  The intercropping system comprised (i) sole rice (R), (ii) rice and cowpea (5:2) (CP) and (iii) rice and ricebean (5:2) (RB) whereas the different nutrient management practices comprised (i) application of farm yard manure (FYM) at 5 t ha–1 (farmers’ practice) (N1), (ii) application of inorganic fertilizer (recommended dose of fertilizer (RDF) of rice, 60:30:30 kg ha–1 of N:P2O5:K2O) (N2) and (iii) application of both FYM at 5 t ha–1 and 50% of RDF inorganic fertilizer (N3).  The results of the experiment revealed that the growth attribute such as leaf area was influenced significantly when fodder crops were taken as intercrops because rice plant was getting more nitrogen from soil due to nitrogen fixation of leguminous fodder crops.  Among the nutrient management practices, significant differences in leaf area were found beween N2 and N1, and between N3 and N1 treatments.  However, regarding total number of effective tillers, significant differences were found neither between nutrient management practices nor between cropping systems.  The rice equivalent yield (REY) based on price (REYP) was found to be significantly lower in CP (2 615 kg ha–1; –6.4%) and RB intercropping systems (2 571 kg ha–1; –8.0%)  than in R monocropping system (2 794 kg ha–1).  However, the REY based on energy (REYE) of CP (2 999 kg ha–1; +7.3%) and RB (2 960 kg ha–1; +5.9%) were found to be significantly higher than that of R (2 794 kg ha–1) irrespective of nutrient management practices.  Between different nutrient management practices, the N3 treatment recorded the highest REYP and REYE which was at par with the N2 treatment and significantly higher than the N1 treatment irrespective of cropping systems.  The combined application of both organic and inorganic sources of nutrients helped to supply nutrients throughout the growing season, which led to improved growth parameters and rice yield.  The R monocropping system resulted in more income and rain water use efficiency (RWUE) closely followed by rice and fodder intercropping systems.  However, the REYE and energy use efficiency (EUE) of rice and fodder intercropping systems were higher than those of R.  Also, fodder helped to meet the requirement of cattle feeding in the off-season.  Hence, the intercropping system is advocated in the study zone.  Further study can be done on ecosystem services and carbon sequestration potential of the intercropping system, as well as the system’s coping ability in response to short drought through observing periodic soil moisture regime in root zone.  
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Impacts of Sletr1-1 and Sletr1-2 mutations on the hybrid seed quality of tomatoes
Syariful Mubarok, Hiroshi Ezura, Anas, Kusumiyati, Neni Rostini, Erni Suminar, Gungun Wiguna
2019, 18 (5): 1170-1176.   DOI: 10.1016/S2095-3119(19)62614-6
Abstract217)      PDF in ScienceDirect      
Shelf life is an important breeding trait in tomato, especially for the tomato production in subtropical and tropical regions.  Previously we have isolated and characterized ethylene receptor mutants, Sletr1-1 and Sletr1-2 from mutant population based on Micro-Tom cultivar.  Sletr1-1 showed insensitivity to ethylene while Sletr1-2 showed reduced sensitivity to ethylene.  We also have demonstrated that the traits are useful for extending fruit shelf life of the hybrid tomato cultivars.  For commercializing the hybrid cultivars, the seed quality is another important trait.  In this study, we evaluated the effects of the Sletr1-1 and Sletr1-2 mutations on the seed quality characteristics of F1 hybrid lines generated by crossing Sletr1-1 and Sletr1-2 with three commercial tomato cultivars, Intan, Mutiara and Ratna.  Sletr1-1 mutation conferred insensitivity to ethylene in the F1 hybrid seedlings, resulting in negative effects including reduced germination rate, vigor index and emergence speed index.  Interestingly Sletr1-2 mutation had almost no effect on the seed quality characteristics of the F1 hybrid lines, suggesting that Sletr1-2 was suitable for producing high quality of hybrid seeds.
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Endocrine and ovarian responses in water buffalo cows immunized against inhibin and subjected to the Ovsynch protocol
Abdalla Bahareldin-Ali, QIN Guang-sheng, GUO Ri-hong, Anastasia Tsigkou, TAN Zheng-zhun, HUANG Jian, LI Hui, LI Hui, SHI Zhen-dan
2015, 14 (9): 1827-1837.   DOI: 10.1016/S2095-3119(15)61034-6
Abstract2015)      PDF in ScienceDirect      
The aim of this study was to investigate the feasibility of stimulating ovarian follicle development in order to improve fertility in water buffalo cows by immunization against inhibin. The experiment was carried out in early summer (May) and included 24 multi-parity crossbred Murrah-Swamp buffaloes that were divided into immunized (n=11) and control (n=13) groups. Each immunized cow was administered with a 2-mL immunogen of mineral oil adjuvant containing 2 mg of recombinant inhibin α-subunit fusion protein. The controls were treated with the adjuvant only. All animals received Ovsynch protocol treatment, starting on the day of the antigen administration, and they were artificially inseminated upon behavioral estrus. As a result, all of the immunized buffaloes generated antibodies against inhibin during the experimental period and had higher plasma concentrations of follicle-stimulating hormone (FSH), activin, and estradiol (E2) related to estrous expression. A higher proportion of immunized animals expressed estrus behavior than did the controls (72% vs. 30%, P<0.05). On average, inhibin-immunized buffaloes had significantly more large follicles (≥9 mm in diameter) than the controls (mean±SEM; 1.2±0.1 vs. 0.84±0.1, respectively; P<0.05) and a slightly higher mean total number of follicles (≥2 mm; 11.4±0.7 vs. 9.0±1.1, respectively; P=0.09) and small (2–4 mm) follicles (8.81±0.6 vs. 6.84±1.0, respectively; P=0.12). A higher percentage of cows ovulated in the immunized group than in the control group (91% (10/11) vs. 54% (7/13), respectively; P<0.05). Moreover, inhibin-immunized cows had slightly larger corpus luteum (CL) than the controls 9 days after ovulation and significantly higher (P<0.01) post-ovulation peak plasma progesterone (P4) concentrations. Immunization against inhibin also marginally increased the conception rate 42 days after insemination (45.8% vs. 15.4%; P>0.05). These results demonstrate that immunization against inhibin, coupled with the treatment with the Ovsynch protocol, can constitute a new technique to increase fertility in water buffalo cows.
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Application of Natural Antioxidants from Strawberry Tree (Arbutus unedo L.) and Dog Rose (Rosa canina L.) to Frankfurters Subjected to Refrigerated Storage
Mónica Armenteros, David Morcuende, Sonia Ventanas , Mario Estévez
2013, 12 (11): 1972-1981.   DOI: 10.1016/S2095-3119(13)60635-8
Abstract1590)      PDF in ScienceDirect      
The effect of the addition of natural antioxidants from strawberry tree (Arbutus unedo L.; AU) and dog rose (Rosa canina L.; RC), in frankfurters elaborated with or without the addition of antioxidant additives (sodium ascorbate and nitrite) was studied. Six different types of experimental frankfurters were prepared depending on the addition of phenolic-rich extracts from RC and AU and the presence (P) or absence (C) of antioxidant additives. Thiobarbituric acid reactive substances (TBARS)-numbers significantly increased during chilled storage of C-frankfurters while additives and fruit phenolics inhibited lipid oxidation in P-frankfurters. The amount of protein carbonyls significantly increased in all treatments except in P-AU frankfurters. The discoloration process that occurred during the chilled storage was reduced by the addition of substances with proven antioxidant activity (P-frankfurters). Texture characteristics as hardness, springiness, cohesiveness and gumminess also suffered a significant deterioration in C-frankfurters. The use of phenolic fruit extracts in combination with traditional antioxidant additives is a successful strategy to enhance the oxidative stability of frankfurters without modifying their color and texture properties.
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