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首页> 外文期刊>Genetics: A Periodical Record of Investigations Bearing on Heredity and Variation >Complex Genetic Effects on Early Vegetative Development Shape Resource Allocation Differences Between Arabidopsis lyrata Populations
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Complex Genetic Effects on Early Vegetative Development Shape Resource Allocation Differences Between Arabidopsis lyrata Populations

机译：拟南芥种群早期营养发育形状资源分配差异的复杂遗传效应

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Costs of reproduction due to resource allocation trade-offs have long been recognized as key forces in life history evolution, but little is known about their functional or genetic basis. Arabidopsis lyrata , a perennial relative of the annual model plant A. thaliana with a wide climatic distribution, has populations that are strongly diverged in resource allocation. In this study, we evaluated the genetic and functional basis for variation in resource allocation in a reciprocal transplant experiment, using four A. lyrata populations and F2 progeny from a cross between North Carolina (NC) and Norway parents, which had the most divergent resource allocation patterns. Local alleles at quantitative trait loci (QTL) at a North Carolina field site increased reproductive output while reducing vegetative growth. These QTL had little overlap with flowering date QTL. Structural equation models incorporating QTL genotypes and traits indicated that resource allocation differences result primarily from QTL effects on early vegetative growth patterns, with cascading effects on later vegetative and reproductive development. At a Norway field site, North Carolina alleles at some of the same QTL regions reduced survival and reproductive output components, but these effects were not associated with resource allocation trade-offs in the Norway environment. Our results indicate that resource allocation in perennial plants may involve important adaptive mechanisms largely independent of flowering time. Moreover, the contributions of resource allocation QTL to local adaptation appear to result from their effects on developmental timing and its interaction with environmental constraints, and not from simple models of reproductive costs.
机译：长期以来，人们一直认为由于资源分配的折衷而产生的繁殖成本是生命历史演变的关键力量，但对其功能或遗传基础知之甚少。拟南芥（Arabidopsis lyrata）是一年生模式植物拟南芥（A. thaliana）的多年生亲缘种，气候分布广泛，其种群在资源分配上存在很大差异。在这项研究中，我们评估了互惠移植实验中资源分配变化的遗传和功能基础，使用了北卡罗来纳州（NC）和挪威父母之间杂交的四个A. lyrata种群和F2后代，它们的资源差异最大分配模式。位于北卡罗莱纳州田地站点的数量性状基因座（QTL）上的本地等位基因增加了繁殖产量，同时减少了营养生长。这些QTL与开花期QTL几乎没有重叠。结合QTL基因型和性状的结构方程模型表明，资源分配差异主要是由于QTL对早期营养生长方式的影响，而对后期营养和生殖发育的影响则是级联的。在挪威的一个现场，相同QTL地区的北卡罗莱纳州等位基因降低了生存和生殖输出成分，但这些影响与挪威环境中的资源分配折衷无关。我们的结果表明，多年生植物中的资源分配可能涉及重要的适应机制，而这些机制很大程度上与开花时间无关。而且，资源分配QTL对当地适应的贡献似乎是由于它们对发展时间的影响及其与环境制约因素的相互作用而产生的，而不是由简单的生殖成本模型引起的。

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