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    Response and Drip Irrigation Re-Watering Compensation Effect of Spring Wheat Roots to Drought Stress with Different Drought Tolerance Varieties
    WANG RongRong, CHEN TianPeng, YIN HaoJie, JIANG GuiYing
    Scientia Agricultura Sinica    2023, 56 (24): 4826-4841.   DOI: 10.3864/j.issn.0578-1752.2023.24.003
    Abstract248)   HTML47)    PDF (1109KB)(214)       Save

    【Objective】The objective of this study is to investigate the differences in morphological and physiological responses of root growth of drip irrigated spring wheat with different drought sensitivity to stage drought stress, to further elaborate the physiological mechanisms of drought resistance and water conservation in drip irrigated spring wheat in Xinjiang, and to provide a theoretical basis for further water-saving and high-yield in Xinjiang wheat region. 【Method】 From 2021-2022, the strong drought resistance variety Xinchun 6 and the weak drought resistance variety Xinchun 22 were used as the test materials by using the soil column cultivation method. Mild (T1 and T3, 60%-65% FC, FC is the field capacity) and moderate (T2 and T4, 45%-50% FC) drought stress treatments were conducted during the tillering and jointing stages, with conventional irrigation as the control (CK, 75%-80% FC), the effects of pre-reproductive drought stress on root morphological characteristics (root length density (RLD), root volume density (RVD)), antioxidant system (malondialdehyde (MDA), superoxide dismutase (SOD), peroxidase (POD)), osmoregulation substance (proline (Pro), soluble sugars (SS)) and spatial and temporal characteristics of root activity were studied. The compensatory effect of drip irrigated spring wheat root growth on drought-rehydration was analyzed.【Result】RLD and RVD showed a trend of increasing and then decreasing with increasing drought stress, and under mild drought (T1 and T3) conditions, RLD and RVD in the 20-60 cm soil layer were significantly increased. The MDA content in the root of each soil layer showed an upward trend with the intensification of stress, while SOD, POD, Pro, and SS all increased first and then decreased with the intensification of drought, and gradually increased with the deepening of the soil layer. After rehydration of T1 treatment, root morphological characteristics, antioxidant enzyme activity, osmotic substances and root activity all reached the maximum value, which in turn increased the yield by 2.77% to 19.58% compared to the rest of the treatments. Stepwise regression analysis showed that RVD and SS were important determinants of yield, RLD, SOD and SS were the most significant indicators of Xinchun 6 drought resistance; RLD, MDA and POD were the most significant indicators of Xinchun 22 drought resistance.【Conclusion】Spring wheat maintains 60%-65% FC during the tillering and jointing stages, after drip irrigation and rehydration, it increases the distribution proportion of roots in the 20-60 cm soil layer, enhances the root system’s ability to remove reactive oxygen species and osmotic adjustment, delays root senescence and improves root physiological characteristics, thus increasing yield.

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    Comparative Analysis of the Effects of Different Types of Plastic Film on Peanut Growth and Rhizobacterial Community
    YU TianYi, YANG JiShun, WU ZhengFeng, ZHANG ZhiMeng, SHEN Pu, ZHENG YongMei, LI ShangXia, WU JuXiang, SUN QiQi, WU Yue
    Scientia Agricultura Sinica    2023, 56 (24): 4842-4853.   DOI: 10.3864/j.issn.0578-1752.2023.24.004
    Abstract136)   HTML15)    PDF (803KB)(213)       Save

    【Objective】This study was carried out to investigate the effects of different types of plastic film on peanut rhizobacterial community and peanut growth/yield, explore the relationships between rhizobacterial community and peanut growth/yield, and provide a basis for further improving peanut yield.【Method】Four treatments were set up and conducted for 9 continuous years, including control treatment (LU), black film treatment (HEI), bio-degradable film treatment (JI) and conventional film treatment (PU). Taking the rhizosphere soil of peanut at the flowering stage and mature stage in 2022 as the research object, Illumina MiSeq PE300 as the sequencing platform, and 16S rRNA gene as the target gene, effects of different types of film treatments on the structure and function of rhizobacterial community and the growth and yield of peanut were studied.【Result】Compared with LU, peanut yield was increased by -0.45%-2.34%, 2.44%-14.36% and 6.14%-24.69% in HEI, JI and PU treatment, respectively. At the flowering stage and mature stage, HEI treatment totally altered the relative abundances of 6 rhizobacterial communities at the levels of class and genus, while results of correlation analysis showed that there was no correlation between rhizobacterial community and peanut growth or yield. JI treatment totally altered 6 rhizobacterial communities at the levels of class and genus, among which, 1 class (Blastocatellia) showed positive relationship with peanut yield. PU treatment totally influenced 12 rhizobacterial communities at the levels of class and genus, of these, 1 class (Acidobacteriae) and 1 genus (Ellin6067) were correlated with peanut main stem height and lateral branch number at the flowering stage, 1 class (Clostridia) and 2 genera (Pseudomonas, Ellin6067) were correlated with peanut yield at the mature stage. The functional prediction results of rhizobacterial community showed that HEI treatment reduced the nitrogen and nitrate respiration functions at the flowering stage and mature stage; JI treatment reduced the functions of nitrate reduction, nitrogen respiration and nitrate respiration at the flowering stage, but had no significant effect on nitrogen metabolism at the mature stage; PU treatment decreased aerobic ammonia oxidation and nitrate respiration at the flowering stage, and increased these two nitrogen metabolism functions at the mature stage.【Conclusion】Black film has no significant effect on peanut yield and rhizobacterial community; Bio-degradable film can improve the structure of rhizobacterial community and yield at the mature stage, but its yield increasing effect is not stable; Conventional film possesses better improving effects than bio-degradable film in peanut yield and rhizobacterial community structure and function.

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