在广布的鱼鳞藻中,沿海拔和纬度梯度存在数量性状而非进化潜力的支系变异。

IF 2.4 2区 生物学 Q2 PLANT SCIENCES
Laura Daco, Guy Colling, Diethart Matthies
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引用次数: 0

摘要

前提:强烈的海拔梯度和纬度梯度有助于研究基因分化对类似环境变化的响应。然而,目前还不确定这两种梯度上的环境变化是否会导致数量性状发生类似的遗传变化。外围的北极和高山种群被认为比中心种群的进化潜力要小:方法:我们在一个普通花园中研究了广泛分布的鱼腥草(Anthyllis vulneraria)的数量性状。植物来自从低地到阿尔卑斯山物种海拔极限的 2000 米海拔梯度上的 20 个种群,以及从中欧物种分布中心到其北部分布边缘的 2400 公里纬度梯度上的 20 个种群:大多数性状随着海拔高度和原产地纬度的变化呈现出相似的宗族变化,所有测量性状与年平均温度的关系大小也相似。一些性状的 QST 值高于 FST 值,表明存在多样化选择,但其他性状的 QST 值则小于 FST 值。数量性状的遗传多样性与中性分子标记不相关。对有利条件的可塑性随海拔的升高而降低,随原产地纬度的升高而降低,但性状的可演化性却没有降低:结论:支系变异表明数量性状在两个梯度上存在适应性分化。外围种群的进化潜力不一定会降低,但较低的可塑性可能会威胁到它们在快速变化的气候条件下的生存。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Clinal variation in quantitative traits but not in evolutionary potential along elevational and latitudinal gradients in the widespread Anthyllis vulneraria

Clinal variation in quantitative traits but not in evolutionary potential along elevational and latitudinal gradients in the widespread Anthyllis vulneraria

Premise

Strong elevational and latitudinal gradients allow the study of genetic differentiation in response to similar environmental changes. However, it is uncertain whether the environmental changes along the two types of gradients result in similar genetically based changes in quantitative traits. Peripheral arctic and alpine populations are thought to have less evolutionary potential than more central populations do.

Methods

We studied quantitative traits of the widespread Anthyllis vulneraria in a common garden. Plants originated from 20 populations along a 2000-m elevational gradient from the lowlands to the elevational limit of the species in the Alps, and from 20 populations along a 2400-km latitudinal gradient from the center of the distribution of the species in Central Europe to its northern distributional margin.

Results

Most traits showed similar clinal variations with elevation and latitude of origin, and the magnitude of all measured traits in relation to mean annual temperature was similar. Higher QST values than FST values in several traits indicated diversifying selection, but for others QST was smaller than FST. Genetic diversity of quantitative traits and neutral molecular markers was not correlated. Plasticity in response to favorable conditions declined with elevation and less strongly with latitude of origin, but the evolvability of traits did not.

Conclusions

The clinal variation suggests adaptive differentiation of quantitative traits along the two gradients. The evolutionary potential of peripheral populations is not necessarily reduced, but lower plasticity may threaten their survival under rapidly changing climatic conditions.

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来源期刊
American Journal of Botany
American Journal of Botany 生物-植物科学
CiteScore
4.90
自引率
6.70%
发文量
171
审稿时长
3 months
期刊介绍: The American Journal of Botany (AJB), the flagship journal of the Botanical Society of America (BSA), publishes peer-reviewed, innovative, significant research of interest to a wide audience of plant scientists in all areas of plant biology (structure, function, development, diversity, genetics, evolution, systematics), all levels of organization (molecular to ecosystem), and all plant groups and allied organisms (cyanobacteria, algae, fungi, and lichens). AJB requires authors to frame their research questions and discuss their results in terms of major questions of plant biology. In general, papers that are too narrowly focused, purely descriptive, natural history, broad surveys, or that contain only preliminary data will not be considered.
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