Widespread flower color convergence in Solanaceae via alternate biochemical pathways
Widespread flower color convergence in Solanaceae via alternate biochemical pathways
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DOI：
10.1111/nph.13576
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发表时间：
2016-01-01
期刊：
影响因子：
9.4
通讯作者：
Smith, Stacey D.
中科院分区：
文献类型：
--
作者：
Ng, Julienne;Smith, Stacey D.
表型趋同在整个生命树中十分普遍。虽然最近的研究在确定趋同表型背后的直接机制方面取得了重大进展，但对宏观进化尺度上通过相同或多个途径出现趋同表型的频率和可预测性知之甚少。我们研究了茄科番茄科红色花色的直接原因和进化模式，利用大规模数据挖掘和新的序列数据来重建宏系统发育 共有 1341 种。然后，我们结合光谱和解剖数据来评估红花进化了多少次，不同途径对红色独立起源的相对贡献，以及潜在途径是否通过系统发育相关性预测。我们使用花青素、类胡萝卜素或两种色素的双重生产估计了至少 30 个相对较新的红花起源，在花青素的使用和双重生产方面具有显着的系统发育信号， 表明密切相关的红花物种倾向于采用相同的着色机制。我们的研究首次测试了发育途径是否表现出系统发育信号，并暗示历史偶然性强烈影响新表型的进化。
Phenotypic convergence is rampant throughout the tree of life. While recent studies have made significant progress in ascertaining the proximate mechanisms underlying convergent phenotypes, less is known about the frequency and predictability with which convergent phenotypes arise via the same or multiple pathways at the macroevolutionary scale.We investigated the proximate causes and evolutionary patterns of red flower color in the tomato family, Solanaceae, using large-scale data mining and new sequence data to reconstruct a megaphylogeny of 1341 species. We then combined spectral and anatomical data to assess how many times red flowers have evolved, the relative contribution of different pathways to independent origins of red, and whether the underlying pathway is predicted by phylogenetic relatedness.We estimated at least 30 relatively recent origins of red flowers using anthocyanins, carotenoids, or a dual production of both pigments, with significant phylogenetic signal in the use of anthocyanins and dual production, indicating that closely related red-flowered species tend to employ the same mechanism for coloration.Our study is the first to test whether developmental pathways exhibit phylogenetic signal and implies that historical contingency strongly influences the evolution of new phenotypes.