Ethylene constrains stomatal reopening in Fraxinus chinensis post moderate drought
Ethylene constrains stomatal reopening in Fraxinus chinensis post moderate drought
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DOI：
10.1093/treephys/tpac144
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Xiang-Wen Fang
中科院分区：
文献类型：
--
作者：
Min-Hui Bi;Jiang Chao;Timothy Brodribb;Yu-Jie Yang;Guang-Qian Yao;Hui Jiang;Xiang-Wen Fang
Abstract. Clarifying the mechanisms underlying the recovery of gas exchange following drought is the key to providing insights into plant drought adaptation and habitat distribution. However, the mechanisms are still largely unknown. Targeting processes known to inhibit gas exchange during drought recovery, we measured leaf water potential, the leaf hydraulic conductance, stomatal reopening, abscisic acid (ABA), and the ethylene emission rate (EER) following moderate drought stress in seedlings of the globally pervasive woody tree Fraxinus chinensis. We found strong evidence that the slow stomatal reopening after rehydration is regulated by a slow decrease in EER, rather than changes in leaf hydraulics or foliar ABA levels. This was supported by evidence of rapid gas exchange recovery in plants after treatment with the ethylene antagonist 1-methylcyclopropene (1-MCP). These findings provide evidence to rigorously support ethylene as a key factor constraining stomatal reopening from moderate drought directly, thereby potentially opening new windows for understanding species drought adaptation.
