Interactions among intrinsic water-use efficiency and climate influence growth and flowering in a common desert shrub
Interactions among intrinsic water-use efficiency and climate influence growth and flowering in a common desert shrub
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内在水分利用效率和气候之间的相互作用影响常见沙漠灌木的生长和开花
DOI：
10.1007/s00442-020-04825-3
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发表时间：
2021
期刊：
影响因子：
2.7
通讯作者：
Ehleringer, James R.
中科院分区：
文献类型：
--
作者：
Driscoll, Avery W.;Bitter, Nicholas Q.;Ehleringer, James R.
植物在光合作用碳同化和水分流失之间进行叶级权衡，两者之间的最佳平衡部分取决于水分的可用性。 “保守”用水策略（即优先减少水损失而不是同化碳）往往在干旱环境中受到青睐，而“激进”用水策略（其中碳同化优先于节水）通常在中等环境中受到青睐。当从叶碳同位素比率得出时，内在水分利用效率（iWUE）可作为叶层碳同化与水损失平衡的季节性综合指标。在这里，我们使用莫哈韦沙漠中单个 Encelia farinosa 种群的多年 iWUE、生长和开花记录来评估 iWUE 在水供应年际波动中对植物性能的影响。我们发现个体间 iWUE 存在显着差异，并发现 iWUE 与可用水量相互作用，显着影响生长和开花。然而，iWUE、可用水量和植物性能之间的关系并不普遍表明“保守”用水策略在干旱年份有利，或者“积极”策略在潮湿年份有利。无论可用水量如何，iWUE 与生长几率呈正相关，并且与干旱年份的开花几率呈正相关，但与干旱年份的生长速率呈负相关。此外，我们发现叶片氮含量影响植物的年际表现，个体响应干旱波动的 iWUE 可塑性与早期干旱生存和生长呈负相关。
Plants make leaf-level trade-offs between photosynthetic carbon assimilation and water loss, and the optimal balance between the two is dependent, in part, on water availability. “Conservative” water-use strategies, in which minimizing water loss is prioritized over assimilating carbon, tend to be favored in arid environments, while “aggressive” water-use strategies, in which carbon assimilation is prioritized over water conservation, are often favored in mesic environments. When derived from foliar carbon isotope ratios, intrinsic water-use efficiency (iWUE) serves as a seasonally integrated indicator of the balance of carbon assimilation to water loss at the leaf level. Here, we used a multi-decadal record of annual iWUE, growth, and flowering from a single population ofEncelia farinosain the Mojave Desert to evaluate the effect of iWUE on plant performance across interannual fluctuations in water availability. We identified substantial variability in iWUE among individuals and found that iWUE interacted with water availability to significantly influence growth and flowering. However, the relationships between iWUE, water availability, and plant performance did not universally suggest that “conservative” water-use strategies were advantageous in dry years or that “aggressive” strategies were advantageous in wet years. iWUE was positively related to the odds of growth regardless of water availability and to the odds of flowering in dry years, but negatively related to growth rates in dry years. In addition, we found that leaf nitrogen content affected interannual plant performance and that an individual’s iWUE plasticity in response to fluctuations in aridity was negatively related to early life drought survival and growth.
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脆灌木干旱适应的种内变化：叶子的柔毛和叶子损失的时间随降雨量的变化而变化
影响因子：
2.7
作者：
D. Sandquist;J. Ehleringer
通讯作者：
J. Ehleringer
影响因子：
2.7
作者：
J. Comstock;J. Ehleringer
通讯作者：
J. Comstock;J. Ehleringer
影响因子：
11.6
作者：
Rehfeldt, GE;Tchebakova, NM;Milyutin, LI
通讯作者：
Milyutin, LI
DOI：
10.1073/pnas.2008345117
发表时间：
2020-08-04
影响因子：
11.1
作者：
Driscoll, Avery W.;Bitter, Nicholas Q.;Ehleringer, James R.
通讯作者：
Ehleringer, James R.
生活史权衡随着分布广泛的植物地理范围内的资源可用性而变化。
影响因子：
3.9
作者：
J. Villellas;María B. García
通讯作者：
María B. García