Combined high leaf hydraulic safety and efficiency provides drought tolerance in Caragana species adapted to low mean annual precipitation.
Combined high leaf hydraulic safety and efficiency provides drought tolerance in Caragana species adapted to low mean annual precipitation.
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高叶片水力安全性和效率相结合，为适应低年平均降水量的锦鸡儿品种提供了耐旱性
DOI：
10.1111/nph.16845
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发表时间：
2021-01
期刊：
影响因子：
--
通讯作者：
Scoffoni C
中科院分区：
文献类型：
--
作者：
Yao GQ;Nie ZF;Turner NC;Li FM;Gao TP;Fang XW;Scoffoni C
阐明适应不同降雨量的密切相关物种之间的叶片水力性状与气体交换的协调可以提供对植物栖息地分布和干旱适应的见解。以10种锦鸡儿属植物为材料，研究了不同年平均降水量（MAP）条件下锦鸡儿属植物的叶片水力导度（Kleaf）、气孔导度（gs）、净同化量（A）、脉栓和脱落酸（阿坝）浓度在脱水过程中的变化，以及压力-容积曲线特征和脉解剖特征。我们发现，在不同物种中，K叶损失50%时的叶片（K叶P 50）和最大K叶（K叶最大值）之间呈正相关。来自低MAP环境的物种表现出更负的K叶P50和膨压损失点，以及在完全膨压下更高的K叶最大值和叶比容量，沿着更高的脉密度和每叶面积的中脉木质部，以及更高的K叶最大值与最大g s的比率。更严格的气孔控制介导的更高的阿坝积累在这些物种在脱水过程中导致在干旱期间的水力安全性和内在水分利用效率（WUEI）的增加。我们的研究结果表明，高水力安全性和效率与阿坝产生引发的更大气孔敏感性相结合，并导致更大的WUEI，为适应低MAP环境的锦鸡儿属物种提供了耐旱性。
Clarifying the coordination of leaf hydraulic traits with gas exchange across closely‐related species adapted to varying rainfall can provide insights into plant habitat distribution and drought adaptation. The leaf hydraulic conductance (K leaf), stomatal conductance (g s), net assimilation (A), vein embolism and abscisic acid (ABA) concentration during dehydration were quantified, as well as pressure–volume curve traits and vein anatomy in 10 Caragana species adapted to a range of mean annual precipitation (MAP) conditions and growing in a common garden. We found a positive correlation between Ψleaf at 50% loss of K leaf (K leaf P 50) and maximum K leaf (K leaf‐max) across species. Species from low‐MAP environments exhibited more negative K leaf P 50 and turgor loss point, and higher K leaf‐max and leaf‐specific capacity at full turgor, along with higher vein density and midrib xylem per leaf area, and a higher ratio of K leaf‐max : maximum g s. Tighter stomatal control mediated by higher ABA accumulation during dehydration in these species resulted in an increase in hydraulic safety and intrinsic water use efficiency (WUEi) during drought. Our results suggest that high hydraulic safety and efficiency combined with greater stomatal sensitivity triggered by ABA production and leading to greater WUEi provides drought tolerance in Caragana species adapted to low‐MAP environments.
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来自不同地区的锦鸡儿属物种的种子萌发很大程度上是由环境因素驱动的，而不是系统发育信号
影响因子：
4.6
作者：
Fang XW;Zhang JJ;Xu DH;Pang J;Gao TP;Zhang CH;Li FM;Turner NC
通讯作者：
Turner NC
影响因子：
7.3
作者：
Buckley, Thomas N.
通讯作者：
Buckley, Thomas N.
影响因子：
7.3
作者：
Caringella, Marissa A.;Bongers, Franca J.;Sack, Lawren
通讯作者：
Sack, Lawren
影响因子：
8.8
作者：
Bartlett, Megan K.;Scoffoni, Christine;Sack, Lawren
通讯作者：
Sack, Lawren
影响因子：
7.3
作者：
Brodribb, Tim J.;Jordan, Gregory J.
通讯作者：
Jordan, Gregory J.