Decoupling of functional traits from intraspecific patterns of growth and drought stress resistance
Decoupling of functional traits from intraspecific patterns of growth and drought stress resistance
复制标题
功能性状与种内生长模式和抗旱性的解耦
DOI：
10.1111/nph.18937
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发表时间：
2023
期刊：
影响因子：
9.4
通讯作者：
Anderegg, William R. L.
中科院分区：
文献类型：
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作者：
Kerr, Kelly L.;Fickle, Jaycie C.;Anderegg, William R. L.
功能性状的种内变异可能介导树种的抗旱性，但性状变异是否归因于基因型（G）、环境（E）或G×E相互作用仍然未知。了解种内性状变异的驱动因素以及变异是否介导干旱反应可以改善物种对未来干旱反应的预测。利用跨越气候梯度的颤杨种群，我们研究了田间功能性状的种内变异以及普通花园中繁殖体中G和E的影响。我们还测试了生长和干旱胁迫耐受性之间的性状介导的权衡。我们观察了种群之间的种内性状变异，但这种变异并不一定意味着较热/较干燥的种群具有更高的干旱胁迫耐受性。此外，普通花园的可塑性很低，特别是来自最热/最干燥种群的繁殖体。我们发现没有生长-干旱胁迫耐受性权衡，并且很少有性状与自然种群的死亡率表现出显着关系，这表明所测量的性状之间的种内性状变异并没有强烈介导对干旱胁迫的反应。我们的结果强调了性状介导的干旱胁迫反应的局限性以及复杂的G×E相互作用，这可能是干燥环境中森林干旱胁迫耐受性变化的基础。
Intraspecific variation in functional traits may mediate tree species' drought resistance, yet whether trait variation is due to genotype (G), environment (E), or G×E interactions remains unknown. Understanding the drivers of intraspecific trait variation and whether variation mediates drought response can improve predictions of species' response to future drought.Using populations of quaking aspen spanning a climate gradient, we investigated intraspecific variation in functional traits in the field as well as the influence of G and E among propagules in a common garden. We also tested for trait‐mediated trade‐offs in growth and drought stress tolerance.We observed intraspecific trait variation among the populations, yet this variation did not necessarily translate to higher drought stress tolerance in hotter/drier populations. Additionally, plasticity in the common garden was low, especially in propagules derived from the hottest/driest population. We found no growth–drought stress tolerance trade‐offs and few traits exhibited significant relationships with mortality in the natural populations, suggesting that intraspecific trait variation among the traits measured did not strongly mediate responses to drought stress.Our results highlight the limits of trait‐mediated responses to drought stress and the complex G×E interactions that may underlie drought stress tolerance variation in forests in dry environments.