Role of Hydraulic Signal and ABA in Decrease of Leaf Stomatal and Mesophyll Conductance in Soil Drought-Stressed Tomato

文献类型： 外文期刊

第一作者： Li, Shuang

作者： Li, Shuang;Liu, Junming;Liu, Hao;Gao, Yang;Duan, Aiwang;Li, Shuang;Liu, Junming;Qiu, Rangjian

作者机构：

关键词： drought; leaf water potential; abscisic acid; stomatal conductance; mesophyll conductance; intrinsic water use efficiency

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：4.402； 五年影响因子：5.207 ）

ISSN： 1664-462X

年卷期： 2021 年 12 卷

页码：

收录情况： SCI

摘要： Drought reduces leaf stomatal conductance (g(s)) and mesophyll conductance (g(m)). Both hydraulic signals and chemical signals (mainly abscisic acid, ABA) are involved in regulating g(s). However, it remains unclear what role the endogenous ABA plays in g(m) under decreasing soil moisture. In this study, the responses of g(s) and g(m) to ABA were investigated under progressive soil drying conditions and their impacts on net photosynthesis (A(n)) and intrinsic water use efficiency (WUEi) were also analyzed. Experimental tomato plants were cultivated in pots in an environment-controlled greenhouse. Reductions of g(s) and g(m) induced a 68-78% decline of A(n) under drought conditions. While soil water potential (psi(soil)) was over -1.01 MPa, g(s) reduced as leaf water potential (psi(leaf)) decreased, but ABA and g(m) kept unchanged, which indicating g(s) was more sensitive to drought than g(m). During psi(soil) reduction from -1.01 to -1.44 MPa, psi(leaf) still kept decreasing, and both g(s) and g(m) decreased concurrently following to the sustained increases of ABA content in shoot sap. The g(m) was positively correlated to g(s) during a drying process. Compared to g(s) or g(m), WUEi was strongly correlated with g(m)/g(s). WUEi improved within psi(soil) range between -0.83 and -1.15 MPa. In summary, g(s) showed a higher sensitivity to drought than g(m). Under moderate and severe drought at psi(soil) <= -1.01 MPa, furthermore from hydraulic signals, ABA was also involved in this co-ordination reductions of g(s) and g(m) and thereby regulated A(n) and WUEi.

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