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Coordination of stem and leaf traits define different strategies to regulate water loss and tolerance ranges to aridity
New Phytologist ( IF 9.4 ) Pub Date : 2021-01-16 , DOI: 10.1111/nph.17185
Rosana López 1 , Francisco Javier Cano 2 , Nicolas K. Martin‐StPaul 3 , Hervé Cochard 4 , Brendan Choat 2
Affiliation  

  • Adaptation to drought involves complex interactions of traits that vary within and among species. To date, few data are available to quantify within‐species variation in functional traits and they are rarely integrated into mechanistic models to improve predictions of species response to climate change.
  • We quantified intraspecific variation in functional traits of two Hakea species growing along an aridity gradient in southeastern Australia. Measured traits were later used to parameterise the model SurEau to simulate a transplantation experiment to identify the limits of drought tolerance.
  • Embolism resistance varied between species but not across populations. Instead, populations adjusted to drier conditions via contrasting sets of trait trade‐offs that facilitated homeostasis of plant water status. The species from relatively mesic climate, Hakea dactyloides, relied on tight stomatal control whereas the species from xeric climate, Hakea leucoptera dramatically increased Huber value and leaf mass per area, while leaf area index (LAI) and epidermal conductance (gmin) decreased. With trait variability, SurEau predicts the plasticity of LAI and gmin buffers the impact of increasing aridity on population persistence.
  • Knowledge of within‐species variability in multiple drought tolerance traits will be crucial to accurately predict species distributional limits.


中文翻译:

茎和叶性状的协调定义了不同的策略来调节水分流失和干旱的耐受范围

  • 适应干旱涉及物种内部和物种之间变化的性状的复杂相互作用。迄今为止,几乎没有数据可用来量化物种内部功能性状的变化,并且很少将其集成到机制模型中以改善物种对气候变化响应的预测。
  • 我们量化了沿东南澳大利亚干旱梯度生长的两个哈卡亚物种的功能性状的种内变异。后来使用测量的性状对模型SurEau进行参数化,以模拟移植实验,以确定耐旱性的极限。
  • 栓塞抗性在物种之间变化,但在种群之间没有变化。取而代之的是,种群通过对比一系列有利于植物水分状况动态平衡的性状权衡而适应了较干燥的条件。来自相对贫瘠气候的物种Hakea dactyloides依赖严格的气孔控制,而来自干旱气候的物种Hakea leucoptera显着增加了Huber值和单位面积的叶质量,而叶面积指数(LAI)和表皮电导(g min)降低了。SurEau具有性状变异性,可以预测LAI的可塑性,而g min可以缓冲干旱增加对种群持久性的影响。
  • 了解多种耐旱性状的种内变异性对于准确预测物种分布极限至关重要。
更新日期:2021-03-17
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