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首页> 外文期刊>The New Phytologist >Polyploidy enhances the occupation of heterogeneous environments through hydraulic related trade-offs in Atriplex canescens (Chenopodiaceae)
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Polyploidy enhances the occupation of heterogeneous environments through hydraulic related trade-offs in Atriplex canescens (Chenopodiaceae)

机译：多倍体通过在滨藜属中的水力相关权衡来增强异质环境的占领

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摘要

Plant hydraulic characteristics were studied in diploid, tetraploid and hexaploid cytotypes of Atriplex canescens (Chenopodiaceae) to investigate the potential physiological basis underlying the intraspecific habitat differentiation among plants of different ploidy levels. Populations of A. canescens from different habitats of the Chihuahuan Desert (NewMexico, USA) were analyzed using flow cytometry to determine ploidy levels. Traits related to xylem water transport efficiency and safety against drought-induced hydraulic failure were measured in both stems and leaves. At the stem level, cytotypes of higher ploidy showed consistently lower leaf-specific hydraulic conductivity but greater resistance to drought-induced loss of hydraulic conductivity. At the leaf level, comparisons in hydraulics between cytotypes did not show a consistent pattern, but exhibited high plasticity to proximal environmental conditions related to soil water availability. The results suggest that a trade-off between stem hydraulic efficiency and safety across ploidy levels underlies niche differentiation among different cytotypes of A. canescens. Poly-ploidization may have been facilitated by environmental heterogeneity related to water availability, and variation in water-related physiology found in the present study suggests an important functional basis for the niche differentiation and coexistence of A. canescens cytotypes in desert environments.
机译：研究了滨藜（Ahenplex canescens（Chenopodiaceae））的二倍体，四倍体和六倍体细胞类型的植物水力特性，以研究潜在的生理基础，该生理基础是不同倍性水平植物间种内生境分化的基础。使用流式细胞仪分析了来自奇瓦瓦沙漠（美国新墨西哥州）不同生境的拐杖曲霉的种群，以确定倍性水平。在茎和叶中均测定了与木质部水分输送效率和抗干旱性水力衰竭安全性有关的性状。在茎水平，倍性较高的细胞类型始终显示较低的叶片比水导率，但对干旱引起的水导率损失具有更大的抵抗力。在叶片水平上，细胞类型之间的水力学比较没有显示出一致的模式，但是对与土壤水分利用相关的近端环境条件表现出很高的可塑性。结果表明，茎水力效率和跨倍性水平的安全性之间的权衡是不同细胞类型A. canescens的生态位分化的基础。多倍体化可能已被与水利用有关的环境异质性所促进，并且本研究中发现的与水有关的生理变化表明，沙漠环境中拐杖阿霉素细胞类型的生态位分化和共存的重要功能基础。

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