Villalvazo-Hernández Alejandra, Burgos-Hernández Mireya, González Dolores
Programa de Posgrado en Botánica, Colegio de Postgraduados, Km 36.Federal Highway Mexico-Texcoco Km 36.5, Montecillo, Texcoco 56230, Mexico.
Red de Biodiversidad y Sistemática, Instituto de Ecología, A.C. Old Road to Coatepec Km 351, El Haya, Xalapa 91073, Mexico.
Plants (Basel). 2022 Jun 15;11(12):1579. doi: 10.3390/plants11121579.
The taxonomy of the subfamily Linoideae at the intergeneric and section levels has been questioned throughout the years, and the evolution of floral characters remains poorly understood. In particular, the evolution of flower color is still uncertain, despite its ecological importance and being one of the most variable and striking traits in Angiospermae. We evaluated the phylogenetic relationships of the genera and sections and used the phylogeny to reconstruct the ancestral state of flower color. The results suggest reevaluating the taxonomic status of segregated genera and re-incorporating them into Four of the five sections currently accepted were recovered as monophyletic (, , , and ). We propose accepting the section and reevaluating , whose representatives were recovered in three separate clades. The ancestral flower color for Linoideae was yellow-white. The flower colors purple and yellow-white were recovered at the deepest nodes of the two main clades. Pink, blue, and red colors were the most recent to evolve. These results appear to be related to diversification events, biogeographical history, and ecological aspects of the subfamily. Our reconstruction constitutes the first plausible scenario that explores the evolution of flower color, leading to new testable hypotheses for future research on the flax group.
多年来，亚麻亚科在属间和组级水平上的分类一直受到质疑，花部特征的演化仍知之甚少。特别是，尽管花色在生态学上具有重要意义，且是被子植物中最具变异性和醒目性的性状之一，但其演化仍不确定。我们评估了各属和组之间的系统发育关系，并利用系统发育重建了花色的祖先状态。结果表明，需要重新评估已分离属的分类地位，并将它们重新归入。目前公认的五个组中有四个被恢复为单系类群（、、和）。我们建议接受组，并重新评估组，其代表类群分布在三个不同的分支中。亚麻亚科的祖先花色为黄白色。紫色和黄白色花色出现在两个主要分支的最深节点处。粉色、蓝色和红色是最近演化出来的花色。这些结果似乎与该亚科的多样化事件、生物地理历史和生态方面有关。我们的重建构成了第一个探索花色演化的合理情景，为亚麻类群的未来研究提出了新的可检验假设。
