揭示欧洲山毛榉(Fagus sylvatica L.)南部分布边缘种群的种群内功能变异模式:抗旱性、旱后恢复和表型可塑性。

IF 3.5 2区 农林科学 Q1 FORESTRY Tree physiology Pub Date : 2024-09-03 DOI:10.1093/treephys/tpae107
David Sánchez-Gómez, Ismael Aranda
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引用次数: 0

摘要

了解抗旱性、旱后恢复和表型可塑性的共变模式及其在种群内部的变异性,对于预测森林面对日益干旱的脆弱性至关重要。这方面的知识在迹地边缘尤为迫切,因为在这些地区,树种已接近其生态位边界。虽然这种接近性增加了它们的易感性,但这些种群被认为是抵御环境压力的宝贵基因库。在当前气候变化的背景下,保护这种基因变异性对物种的适应能力至关重要。在这里,我们研究了欧洲山毛榉(Fagus sylvatica L.)南部边缘种群中 16 个开放授粉家系的幼苗对试验性干旱的茎基部生长、气体交换和其他叶片功能特征的种群内模式。我们发现,在叶片功能特征、光合作用表现、生长模式和表型可塑性方面,种群内部对水分供应的反应存在很大差异。低表型可塑性与高抗旱性相关。不同母本品系的抗旱性和旱后光合作用恢复能力都有差异。然而,抗旱性和旱后恢复表现出独立的差异。我们还发现气孔对土壤干燥的敏感性在种群内存在差异,但这与抗旱性和旱后恢复能力都无关。我们的结论是,表型可塑性与抗旱性之间的反比关系并不一定是适应性可塑性不良的表现,相反,它可能反映了功能表现的稳定性,从而适应干旱。抗旱性与旱后恢复之间的独立变异在一定程度上促进了微进化和对日益干旱的适应。观察到的气孔对土壤干燥敏感性的变异与之前在其他尺度上的发现(如种间变异、种群间变异)一致,这对将等无水概念作为耐旱性的可靠替代物提出了挑战。
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Unveiling intra-population functional variability patterns in a European beech (Fagus sylvatica L.) population from the southern range edge: drought resistance, post-drought recovery and phenotypic plasticity.

Understanding covariation patterns of drought resistance, post-drought recovery and phenotypic plasticity, and their variability at the intra-population level are crucial for predicting forest vulnerability to increasing aridity. This knowledge is particularly urgent at the trailing range edge since, in these areas, tree species are proximal to their ecological niche boundaries. While this proximity increases their susceptibility, these populations are recognized as valuable genetic reservoirs against environmental stressors. The conservation of this genetic variability is critical for the adaptive capacity of the species in the current context of climate change. Here we examined intra-population patterns of stem basal growth, gas exchange and other leaf functional traits in response to an experimental drought in seedlings of 16 open-pollinated families within a marginal population of European beech (Fagus sylvatica L.) from its southern range edge. We found a high degree of intra-population variation in leaf functional traits, photosynthetic performance, growth patterns and phenotypic plasticity in response to water availability. Low phenotypic plasticity was associated with higher resistance to drought. Both drought resistance and post-drought recovery of photosynthetic performance varied between maternal lines. However, drought resistance and post-drought recovery exhibited independent variation. We also found intra-population variation in stomatal sensitivity to soil drying, but it was not associated with either drought resistance or post-drought recovery. We conclude that an inverse relationship between phenotypic plasticity and drought resistance is not necessarily a sign of maladaptive plasticity, but rather it may reflect stability of functional performance and hence adaptation to withstand drought. The independent variation found between drought resistance and post-drought recovery should facilitate to some extent microevolution and adaption to increasing aridity. The observed variability in stomatal sensitivity to soil drying was consistent with previous findings at other scales (e.g., inter-specific variation, inter-population variation) that challenge the iso-anisohydric concept as a reliable surrogate of drought tolerance.

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来源期刊
Tree physiology
Tree physiology 农林科学-林学
CiteScore
7.10
自引率
7.50%
发文量
133
审稿时长
1 months
期刊介绍: Tree Physiology promotes research in a framework of hierarchically organized systems, measuring insight by the ability to link adjacent layers: thus, investigated tree physiology phenomenon should seek mechanistic explanation in finer-scale phenomena as well as seek significance in larger scale phenomena (Passioura 1979). A phenomenon not linked downscale is merely descriptive; an observation not linked upscale, might be trivial. Physiologists often refer qualitatively to processes at finer or coarser scale than the scale of their observation, and studies formally directed at three, or even two adjacent scales are rare. To emphasize the importance of relating mechanisms to coarser scale function, Tree Physiology will highlight papers doing so particularly well as feature papers.
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