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极端干旱可能会在耐栓塞物种中禁用ABA生物合成

Joel A Mercado-Reyes¹, Talitha Soares Pereira¹, Anju Manandhar¹

¹Purdue Center for Plant Biology, Department of Botany and Plant Pathology, Purdue University, West Lafayette, Indiana, USA.

Plant, cell & environment

|October 31, 2023

概括

在某些物种的长期干旱期间,植物激素酸 (ABA) 水平在某些物种中动态下降. 这种峰值类型的ABA反应是由ABA结合和失活的生物合成驱动的,在抗旱植物中节约了水.

科学领域:

植物生理学植物生理学
干旱应激反应干旱应激反应
荷尔蒙的调节荷尔蒙的调节

背景情况:

植物在干旱期间合成酸 (ABA),以关闭胃口并增强干燥耐受性.
一个峰值类型 (p类型) 的ABA反应,以初始增加的特征,然后下降到压力前的水平,观察到抗旱的针叶树和树苗.
这种动态的p型ABA反应的潜在机制在很大程度上是未知的.

研究的目的:

阐明驱动针叶树Callitris rhomboidea和抗干旱的血管精子Umbellularia californica中的p型ABA动态的机制.
在这些物种长期干旱期间调查ABA生物合成,结合和代谢.

主要方法:

在遭受长期干旱的盆栽植物中测量叶子水潜力 (Ψl),口腔导电性以及ABA,ABA结合物和相酸 (PA) 的水平.
在经过再水和随后的干的分枝中分析ABA代谢,比较在植物ABA水平峰值之前和之后采集的样本.

主要成果:

在长时间的干旱期间,Callitris rhomboidea和Umbellularia californica都表现出p型的ABA动态.
发现ABA生物合成在叶子失点以后被禁用.
在干旱期间,ABA转化为其合物发生了显著的转化,而转化为PA的代谢是最小的.

结论:

耐旱种子植物的p型ABA下降很可能是通过持续的ABA结合来保护和调节的.
当叶子水潜力变得比流损失点更为负时,ABA积累的禁用发生.
这种监管机制有助于在面临长期干旱压力的植物中实施节水战略.

关键词:

阿布西斯酸是什么?阿布西斯酸是什么绝缘型的葡萄糖.催化剂的催化作用是什么水资源短缺问题缺水问题

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