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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Natural variation in expression of self-incompatibility in Arabidopsis thaliana: implications for the evolution of selfing.
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Natural variation in expression of self-incompatibility in Arabidopsis thaliana: implications for the evolution of selfing.

机译：拟南芥中自交不亲和性表达的自然变化：对自交进化的影响。

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摘要

The switch from an out-crossing to a self-fertilizing mating system is one of the most prevalent evolutionary trends in plant reproduction and is thought to have occurred repeatedly in flowering plants. However, little is known about the evolution of self-fertility and the genetic architecture of selfing. Here, we establish Arabidopsis thaliana as a model for genetic analysis of the switch to self-fertility in the crucifer family, where the ancestral out-crossing mode of mating is determined by self-incompatibility (SI), a genetic system controlled by the S locus. We show that A. thaliana ecotypes exhibit S-locus polymorphisms and differ in their ability to express the SI trait upon transformation with S-locus genes derived from the obligate out-crosser Arabidopsis lyrata. Remarkably, at least one ecotype was reverted to a stable, self-incompatible phenotype identical to that of naturally self-incompatible species. These ecotype differences are heritable and reflect the fixation in different A. thaliana populations of independent mutations that caused or enforced the switch to self-fertility. Their continued analysis promises to identify the loci that were the targets of natural selection for selfing and to contribute to a mechanistic understanding of the SI response.
机译：从异型杂交到自体杂交系统是植物繁殖中最普遍的进化趋势之一，被认为在开花植物中反复发生。但是，关于自我生育能力的进化和自交的遗传结构知之甚少。在这里，我们建立拟南芥作为十字花科家庭向自育能力转换的遗传分析模型，其中交配的祖传杂交方式由自交不亲和性（SI）决定，SI由S控制轨迹。我们显示拟南芥生态型表现出S-基因座多态性，并在转化自专性异源拟南芥属的S-基因座基因转化后表达SI性状的能力上有所不同。值得注意的是，至少一种生态型被还原为与自然自身不相容物种相同的稳定，自身不相容表型。这些生态型差异是可遗传的，反映了不同突变的拟南芥种群中对独立突变的固定作用，这些突变导致或迫使人们转向自育。他们的继续分析有望确定作为自选自然选择目标的基因座，并有助于对SI反应的机械理解。

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