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Trait plasticity and covariance along a continuous soil moisture gradient
bioRxiv - Plant Biology Pub Date : 2021-01-17 , DOI: 10.1101/2020.02.17.952853
J. Grey Monroe , Haoran Cai , David L. Des Marais

Water availability is perhaps the greatest environmental determinant of plant yield and fitness. However, our understanding of plant-water relations is limited because it is primarily informed by experiments considering soil moisture variability at two discrete levels - wet and dry - rather than as a continuously varying environmental gradient. Here we used experimental and statistical methods based on function-valued traits to explore responses to a continuous soil moisture gradient in physiological and morphological traits in two species and five genotypes each of the model grass Brachypodium. We find that most traits exhibit non-linear responses to soil moisture variability. We also observe differences in the shape of these non-linear responses between traits, species, and genotypes. Emergent phenomena arise from this variation including changes in trait correlations and evolutionary constraints as a function of soil moisture. These results point to the importance of considering non-linearity in plant-water relations to understand plastic and evolutionary responses to changing climates.

中文翻译:

沿连续土壤水分梯度的性状可塑性和协方差

水分供应可能是决定植物产量和适应性的最大环境决定因素。但是,我们对植物与水的关系的理解是有限的,因为它主要是通过考虑土壤湿度在两个离散水平(湿和干)而不是作为连续变化的环境梯度的实验获得的。在这里,我们使用基于函数值性状的实验和统计方法,探索了两种模式草短枝po的两个物种和五个基因型对土壤水分连续梯度的生理和形态性状的响应。我们发现大多数性状表现出对土壤水分变化的非线性响应。我们还观察到性状,物种和基因型之间这些非线性响应的形状差异。这种变化产生了新的现象,包括性状相关性的变化和作为土壤水分的函数的进化限制。这些结果表明,必须考虑植物与水之间的非线性关系,以理解对气候变化的可塑性和进化反应。
更新日期:2021-01-18
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