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在玉米中源沉调节衰老的遗传结构

Rohit Kumar¹, Manwinder S Brar¹, Bharath Kunduru¹

¹Department of Genetics and Biochemistry, Clemson University, Clemson, SC 29634, USA.

Plant physiology

|August 18, 2023

概括

了解植物如何衰老 (衰老) 是改善作物的关键. 这项研究表明,当植物缺乏强大的水槽时,光合作用反,氧化应激和ER应激会触发衰老,为提高作物产量提供新的途径.

科学领域:

植物生物学植物生物学
分子遗传学分子遗传学
农业科学农业科学

背景情况:

源沉相互作用极大地调节了植物的衰老,但基本的机制仍然不太清楚.
衰老,植物的衰老过程,影响作物产量和质量.

研究的目的:

阐明玉米中源下沉调控衰老 (SSRS) 的遗传和分子机制.
确定涉及SSRS的基因和途径.

主要方法:

对玉米基因型进行了表型,转录和系统遗传学分析,对比的SSRS表型.
使用双亲种群和多样性小组进行定量特征位点 (QTL) 和候选基因识别.
候选基因的验证,包括cathepsin B类似蛋白质酶4 (ccp4) 的验证,通过自然等位基因分析和Arabidopsis的异质表达.

主要成果:

衰弱的水槽需求最初导致了光合作用的反抑制,反应性氧物种 (ROS) 激增,以及内质网膜 (ER) 应激.
12个QTL和24个候选基因被确定为SSRS.
在ccp4中含有ABA-响应元素的700bp多态促进子区域与差异转录调节和SSRS变异有关.

结论:

建议SSRS的一个模型涉及反光合作用抑制,ABA信号和氧化应激融合以诱导ER应激,编程细胞死亡和衰老.
这些发现有助于更好地理解从失去了水槽强度的信号.
提供了修改衰老路径以提高作物生产率的机会.

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