Rapid drought-recovery of gas exchange in Caragana species adapted to low mean annual precipitation
Rapid drought-recovery of gas exchange in Caragana species adapted to low mean annual precipitation
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DOI：
10.1111/pce.14635
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发表时间：
2023-06-09
影响因子：
7.3
通讯作者：
Fang，Xiang-Wen
中科院分区：
文献类型：
--
作者：
Bi，Min-Hui;Jiang，Chao;Fang，Xiang-Wen
虽然一个物种的原生栖息地的平均年降水量（MAP）的变化已被证明是确定一个物种在干旱期间抵抗水力下降的能力，但MAP的这些变化是否也影响物种恢复和生存干旱的能力仍然是未知的。叶水分和气体交换恢复干旱和潜在的机制，这些响应在6锦鸡儿属物种的栖息地沿着一个大的降水梯度进行了研究，在一个共同的花园复水。在轻度、中度和重度干旱胁迫处理后，干旱生境的物种在复水过程中的气体交换比湿润生境的物种恢复得更快。气体交换的恢复与叶片脱落酸浓度无关，而与叶片导水率（Kleaf）的恢复密切相关。在轻度和中度干旱胁迫下，叶片K叶的恢复与脱水过程中K叶的损失有关，而在重度干旱胁迫下，则与叶片木质部栓塞的形成有关。结果表明，干旱后6种锦鸡儿在气体交换方面的不同恢复能力与该物种在其原生生境中的MAP有关。
While variation in mean annual precipitation (MAP) of the native habitat of a species has been shown to determine the ability of a species to resist a hydraulic decrease during drought, it remains unknown whether these variations in MAP also influence the ability of a species to recover and survive drought. Leaf hydraulic and gas exchange recovery following drought and the underlying mechanisms of these responses in sixCaraganaspecies from habitats along a large precipitation gradient were investigated during rehydration in a common garden. The gas exchange of species from arid habitats recovered more rapidly during rehydration after mild, moderate and severe drought stress treatments than species from humid habitats. The recovery of gas exchange was not associated with foliar abscisic acid concentration, but tightly related to the recovery of leaf hydraulic conductance (Kleaf). The recovery ofKleafwas associated with the loss ofKleafduring dehydration under mild and moderate drought stress, and to leaf xylem embolism formation under severe drought stress. Results pointed to the different ability to recover in gas exchange in sixCaraganaspecies post‐drought is associated with the MAP of the species in its native habitat.