Fire regimes and pollinator behaviour explain the genetic structure of Puya hamata (Bromeliaceae) rosette plants

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS
Gabriel Rivadeneira, Paul M. Ramsay, Rommel Montúfar
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引用次数: 5

Abstract

Ecological interactions play a fundamental role in determining the genetic structure of plant species in time and space. The demography of the Andean Puya hamata has been linked to fire regimes and hummingbird behaviour, which might modify the plant’s population genetic structure. Naturally, poor dispersal results in patches of genetically related plants, a pattern intensified further by burning which promotes seedling germination around parent plants. Later, when these plants flower, large patches are attractive to territorial hummingbirds which prevent visits by traplining hummingbird species, carrying pollen from likely unrelated plants. To explore this hypothesis, a genetic study of P. hamata using microsatellite markers was conducted with (i) isolated and grouped adults in two size categories of patches, and (ii) seeds collected from the same patches and isolated individuals. Isolated individual plants presented a higher observed heterozygosity with close to zero inbreeding. Adult plants from large patches showed a lower observed heterozygosity and higher inbreeding than plants from other spatial contexts. Seed genetic structure displayed a gradient of diversity: lower at patch centres but higher at patch edges, in small patches, and for isolated infructescences. The spatial context of these plants, especially the contrast between large patch centres and other situations, determines the genetic diversity of their seeds via hummingbird foraging behaviour. Territorial hummingbirds restrict gene flow in and out of large patches, but traplining hummingbirds maintain genetic diversity among isolated plants, small patches, and plants at the edges of large patches. Our study illustrates the need to consider interactions between land use, plants, and their pollinators when considering genetic diversity at the landscape scale.

火情和传粉昆虫行为解释了蒲芽莲座植物的遗传结构
生态相互作用在决定植物物种在时间和空间上的遗传结构方面发挥着重要作用。安第斯Puya hamata的种群结构与火灾状态和蜂鸟行为有关,这可能会改变该植物的种群遗传结构。自然地,不良的扩散会导致遗传相关植物的斑块,这种模式通过燃烧进一步加剧,从而促进亲本植物周围的幼苗发芽。后来,当这些植物开花时,大片的蜂鸟对领地蜂鸟很有吸引力,因为它们携带着可能不相关的植物的花粉,阻止了迁徙的蜂鸟物种的造访。为了探索这一假设,使用微卫星标记对滨鹬进行了一项遗传学研究,研究对象是(i)分离并分组为两种大小斑块的成虫,以及(ii)从相同斑块和分离个体中收集的种子。分离的单株表现出较高的观察到的杂合性,接近零近亲繁殖。与其他空间环境中的植物相比,来自大斑块的成年植物表现出较低的观察到的杂合性和较高的近亲繁殖。种子遗传结构表现出多样性的梯度:在斑块中心较低,但在斑块边缘、小斑块和孤立的果序中较高。这些植物的空间背景,特别是大型斑块中心和其他情况之间的对比,通过蜂鸟的觅食行为决定了它们种子的遗传多样性。地域性蜂鸟限制了基因在大斑块中的进出,但寄生蜂鸟在孤立的植物、小斑块和大斑块边缘的植物之间保持着遗传多样性。我们的研究表明,在景观尺度上考虑遗传多样性时,需要考虑土地利用、植物及其传粉昆虫之间的相互作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
ACS Applied Bio Materials
ACS Applied Bio Materials Chemistry-Chemistry (all)
CiteScore
9.40
自引率
2.10%
发文量
464
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