Physiological responses related to increased grain yield under drought in the first biotechnology-derived drought-tolerant maize
Physiological responses related to increased grain yield under drought in the first biotechnology-derived drought-tolerant maize
复制标题
DOI：
10.1111/pce.12446
复制
发表时间：
2015-09-01
影响因子：
7.3
通讯作者：
Lawson, Mark
中科院分区：
文献类型：
--
作者：
Nemali, Krishna S.;Bonin, Christopher;Lawson, Mark
玉米（Zea mays ssp. maysL.）对干旱胁迫非常敏感。本工作集中于全植物生理机制，通过该机制，表达细菌冷激蛋白B（Csp B）的生物技术衍生的玉米事件，MON 87460，在干旱下增加谷物产量。在2009-2011年期间，在营养中期至生殖中期期间施加的充分浇水（WW）和限水（WL）处理下，在田间测试MON 87460和常规对照（下文称为“对照”）的植物。在WL条件下，与对照相比，MON 87460多年平均谷物产量增加了6%。这与MON 87460在处理阶段0.5m深度处土壤含水量较高，穗生长增加，吐丝期间叶面积、叶干重和液流速率降低，籽粒数和收获指数增加有关。在WW条件下未观察到一致性差异。这表明MON 87460在WL条件下比对照更好地适应，通过降低叶片生长，这减少了吐丝期间的水分使用，从而在WL条件下引起较低的胁迫。在WL条件下，MON 87460的这些生理反应导致吐丝期间穗的生长增加，从而与对照相比增加了粒数、收获指数和籽粒产量。这项工作集中在全植物的生理机制，其中第一个生物技术衍生的玉米事件表达细菌冷休克蛋白B，MON 87460，在水分有限的条件下，增加粮食产量。我们的研究结果表明，MON 87460通过降低需水量来更好地适应干旱胁迫，从而降低胁迫暴露并提高干旱下的产量。这份手稿与《气候智能型气候》特刊的理念有很大的相关性。
Maize (Zea mays ssp. maysL.) is highly susceptible to drought stress. This work focused on whole-plant physiological mechanisms by which a biotechnology-derived maize event expressing bacterial cold shock protein B (CspB), MON 87460, increased grain yield under drought. Plants of MON 87460 and a conventional control (hereafter control') were tested in the field under well-watered (WW) and water-limited (WL) treatments imposed during mid-vegetative to mid-reproductive stages during 2009-2011. Across years, average grain yield increased by 6% in MON 87460 compared with control under WL conditions. This was associated with higher soil water content at 0.5m depth during the treatment phase, increased ear growth, decreased leaf area, leaf dry weight and sap flow rate during silking, increased kernel number and harvest index in MON 87460 than the control. No consistent differences were observed under WW conditions. This indicates that MON 87460 acclimated better under WL conditions than the control by lowering leaf growth which decreased water use during silking, thereby eliciting lower stress under WL conditions. These physiological responses in MON 87460 under WL conditions resulted in increased ear growth during silking, which subsequently increased the kernel number, harvest index and grain yield compared to the control.Maize is highly susceptible to drought stress. This work focused on whole-plant physiological mechanisms by which the first biotechnology-derived maize event expressing bacterial cold shock protein B, MON87460, increased grain yield under water-limited conditions. Our results indicate that MON87460 acclimated better to drought stress by lowering water requirement, thereby lower stress exposure and increased yield under drought. This manuscript has great relevance to the philosophy of the special issue on Climate Smart Agriculture'.