Adaptation to drought in two wild tomato species: the evolution of the Asr gene family
Adaptation to drought in two wild tomato species: the evolution of the Asr gene family
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DOI：
10.1111/j.1469-8137.2011.03648.x
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发表时间：
2011-01-01
期刊：
影响因子：
9.4
通讯作者：
Stephan, Wolfgang
中科院分区：
文献类型：
--
作者：
Fischer, Iris;Camus-Kulandaivelu, Letizia;Stephan, Wolfgang
野生番茄物种是研究当地对干旱适应性的一个有价值的系统：它们生长在从中等干旱到极端干旱的各种环境中。本文研究了Asr（阿坝/water stress/ripening induced）基因家族成员的进化，分析了两个近缘物种Solanum chilense和Solanum peruvianum种群中Asr基因家族成员的分子变异，得出Asr 1在强净化选择下进化的结论。与以前的报道相反，我们没有发现在Asr 2的正选择的证据。然而，Asr 4显示出与S.生活在极端干旱环境中的智利人。结果表明，Asr基因是一个动态的基因家族，是一个重要的串联基因家族。考虑到物种的潜在分布，似乎S。peruvianum能科普各种环境条件，而S.智利语更经常地适应当地环境。
P>Wild tomato species are a valuable system in which to study local adaptation to drought: they grow in diverse environments ranging from mesic to extremely arid conditions. Here, we investigate the evolution of members of the Asr (ABA/water stress/ripening induced) gene family, which have been reported to be involved in the water stress response.We analysed molecular variation in the Asr gene family in populations of two closely related species, Solanum chilense and Solanum peruvianum.We concluded that Asr1 has evolved under strong purifying selection. In contrast to previous reports, we did not detect evidence for positive selection at Asr2. However, Asr4 shows patterns consistent with local adaptation in an S. chilense population that lives in an extremely dry environment. We also discovered a new member of the gene family, Asr5.Our results show that the Asr genes constitute a dynamic gene family and provide an excellent example of tandemly arrayed genes that are of importance in adaptation. Taking the potential distribution of the species into account, it appears that S. peruvianum can cope with a great variety of environmental conditions without undergoing local adaptation, whereas S. chilense undergoes local adaptation more frequently.