Rapid evolution of a family‐diagnostic trait: artificial selection and correlated responses in wild radish, Raphanus raphanistrum
Rapid evolution of a family‐diagnostic trait: artificial selection and correlated responses in wild radish, Raphanus raphanistrum
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家族诊断性状的快速进化：野萝卜 Raphanus raphanistrum 的人工选择和相关反应
DOI：
10.1111/nph.19125
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发表时间：
2023
期刊：
影响因子：
9.4
通讯作者：
Karoly, Keith
中科院分区：
文献类型：
--
作者：
Conner, Jeffrey K.;Issaka Salia, Ousseini;Zhao, Zhi‐Gang;Knapczyk, Frances;Sahli, Heather;Koelling, Vanessa A.;Karoly, Keith
长期进化时间尺度上性状保守的潜在机制知之甚少。这些机制可分为两大类，即约束和选择。许多因素被假设为限制性状进化。或者，如果选择的原因也相对保守，选择可以在许多物种中保持相似的性状值，而许多限制来源可以在较长的进化分歧时期内被克服。深层性状保存的一个例子是在大科中的四雄蕊群，其中四个内侧雄蕊比两个侧雄蕊长。以前的工作已经发现选择保持这种长度的差异，我们称之为花药分离，在野生萝卜，萝卜。在这里，我们测试了约束假设，使用五代人工选择，以减少花药分离在野生萝卜。我们发现了一个快速的线性反应，这种选择，没有证据表明15个其他性状中只有4个的遗传变异和对这种选择的相关反应被耗尽，这表明缺乏强有力的约束。综上所述，现有的证据表明，由于选择，四强性可能是保守的，但这一特征的功能仍不清楚。
The mechanisms underlying trait conservation over long evolutionary time scales are poorly known. These mechanisms fall into the two broad and nonmutually exclusive categories of constraint and selection. A variety of factors have been hypothesized to constrain trait evolution. Alternatively, selection can maintain similar trait values across many species if the causes of selection are also relatively conserved, while many sources of constraint may be overcome over longer periods of evolutionary divergence. An example of deep trait conservation is tetradynamy in the large family Brassicaceae, where the four medial stamens are longer than the two lateral stamens. Previous work has found selection to maintain this difference in lengths, which we call anther separation, in wild radish,Raphanus raphanistrum.Here, we test the constraint hypothesis using five generations of artificial selection to reduce anther separation in wild radish.We found a rapid linear response to this selection, with no evidence for depletion of genetic variation and correlated responses to this selection in only four of 15 other traits, suggesting a lack of strong constraint.Taken together, available evidence suggests that tetradynamy is likely to be conserved due to selection, but the function of this trait remains unclear.