Ethylene, not ABA, is closely linked to the recovery of gas exchange after drought in four Caragana species.
Ethylene, not ABA, is closely linked to the recovery of gas exchange after drought in four Caragana species.
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DOI：
10.1111/pce.13934
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发表时间：
2020-11
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通讯作者：
Guang-qian Yao;Feng-Ping Li;Zheng-Fei Nie;Min-Hui Bi;Hui Jiang;Xu-Dong Liu;Yang Wei;Xiang-Wen Fang
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作者：
Guang-qian Yao;Feng-Ping Li;Zheng-Fei Nie;Min-Hui Bi;Hui Jiang;Xu-Dong Liu;Yang Wei;Xiang-Wen Fang
干旱是自然环境中的一种周期性现象。在脱水过程中，气孔关闭主要受脱落酸（阿坝）动态的调控，ABA动态限制了种子植物的蒸腾作用，但复水后，气体交换恢复的机制尚不清楚。以4种锦鸡儿属（Caragana）植物为试材，研究了等水（C.和C.粉叶C. intermedia)和柠条锦鸡儿(C.小叶）性状。ABA诱导气孔关闭的两个等水物种的gs和Kleaf对ψ叶减少的敏感性高于阿坝诱导气孔关闭的两个不等水物种。再水化后，气体交换的恢复与阿坝水平的降低无关，但受到所有物种乙烯释放速率下降的强烈限制。此外，具有低干旱诱导乙烯产生的两种异氢酸物种在再水化后的气体交换中表现出更快的恢复。研究结果表明，乙烯是调节干旱恢复能力的关键因子，可能影响物种对干旱的适应性和潜在的物种分布。本文受版权保护。All rights reserved.
Drought is a cyclical phenomenon in natural environments. During dehydration, stomatal closure is mainly regulated by abscisic acid (ABA) dynamics that limit transpiration in seed plants, but following rehydration, the mechanism of gas exchange recovery is still not clear. In this study, leaf water potential (ψleaf ), stomatal conductance (gs ), leaf hydraulic conductance (Kleaf ), foliar ABA level, ethylene emission rate in response to dehydration and rehydration were investigated in four Caragana species with isohydric (C. spinosa and C. pruinosa) and anisohydric (C. intermedia and C. microphylla) traits. Two isohydric species with ABA-induced stomatal closure, exhibited more sensitive gs and Kleaf to decreasing ψleaf than two anisohydric species which exhibited a switch from ABA to water potential-driven stomatal closure during dehydration. Following rehydration, the recovery of gas exchange was not associated with a decrease in ABA level but was strongly limited by the degradation of ethylene emission rate in all species. Furthermore, two anisohydric species with low drought-induced ethylene production, exhibited more rapid recovery in gas exchange upon rehydration. Our results indicated that ethylene is a key factor regulating the drought-recovery ability in terms of gas exchange, which may shape species adaptation to drought and potential species distribution. This article is protected by copyright. All rights reserved.