Parallel evolution of dominant pistil-side self-incompatibility suppressors in Arabidopsis
Parallel evolution of dominant pistil-side self-incompatibility suppressors in Arabidopsis
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DOI：
10.1038/s41467-020-15212-0
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发表时间：
2020-03-16
影响因子：
16.6
通讯作者：
Takayama, Seiji
中科院分区：
文献类型：
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作者：
Fujii, Sota;Shimosato-Asano, Hiroko;Takayama, Seiji
自交是被子植物的一种常见的进化趋势，是研究适应进化的循环模式的合适模型。许多植物通过称为自交不亲和（SI）的生理过程来避免自交受精。在十字花科植物中，雄性配体SP11/SCR与雌性受体激酶SRK之间的直接和特异性相互作用是SI响应的必要条件。虽然拟南芥通过失去这些基因获得了自交配，但分子进化对自亲和性等位基因传播的贡献还需要进一步的研究。我们在这里表明，在这个物种中，主要的SRK沉默基因至少进化了两次。在Col-0和C24菌株的残余SRK区发现了不同的反向重复序列。两种类型的反向重复都以不同的靶特异性以显性方式抑制功能性SRK序列。这可能是这些SI的显性抑制因子促成了拟南芥的自亲和性的快速固定。
Selfing is a frequent evolutionary trend in angiosperms, and is a suitable model for studying the recurrent patterns underlying adaptive evolution. Many plants avoid self-fertilization by physiological processes referred to as self-incompatibility (SI). In the Brassicaceae, direct and specific interactions between the male ligand SP11/SCR and the female receptor kinase SRK are required for the SI response. Although Arabidopsis thaliana acquired autogamy through loss of these genes, molecular evolution contributed to the spread of self-compatibility alleles requires further investigation. We show here that in this species, dominant SRK silencing genes have evolved at least twice. Different inverted repeat sequences were found in the relic SRK region of the Col-0 and C24 strains. Both types of inverted repeats suppress the functional SRK sequence in a dominant fashion with different target specificities. It is possible that these dominant suppressors of SI contributed to the rapid fixation of self-compatibility in A. thaliana.