Suppr超能文献

Sebaea(龙胆科)中 Diplostigmaty 的祖先进化和单系性及其作为一种形态混合交配策略的潜在作用。

Ancestral and monophyletic presence of diplostigmaty in Sebaea (Gentianaceae) and its potential role as a morphological mixed mating strategy.

机构信息

Institute of Biology, Evolutionary Botany, University of Neuchâtel, Rue Emile-Argand 11, CH-2009 Neuchâtel, Switzerland.

Institute of Systematic Botany, University of Zürich, Zollikerstrasse 107, CH-8008 Zürich, Switzerland.

出版信息

New Phytol. 2009 Oct;184(2):303-310. doi: 10.1111/j.1469-8137.2009.03000.x.

Abstract
  • Diplostigmaty, the presence of a primary (apical) stigma and secondary (mid-stylar) stigmas along the style, is only known from the genus Sebaea (Gentianaceae). Early work indicated that the secondary stigmas provide a mechanism of autogamy, suggesting that it might ensure reproductive assurance. * Here, we test the monophyly of this unique morphological trait. Using Bayesian methods, we infer a nuclear DNA phylogeny for 96 accessions, including c. 50% of the species from the genus Sebaea. With this phylogeny, we infer the distribution of ancestral states on critical nodes using parsimony and likelihood methods. * The inferred nrDNA phylogeny shows that the genus Sebaea is divided in two statistically well-supported clades, A and B, consistent with recent estimates. The most recent ancestor (MRCA) of clade A, except the most basal species (Sebaea pusilla), is resolved as diplostigmatic. No reversal to a single stigma is observed within this clade. * We suggest that diplostigmaty is evolutionarily stable through time. We also discuss why this reproductive system is not found elsewhere than in Gentianaceae and the potential advantage of diplostigmaty as a stable mixed mating strategy.
摘要
  • 胎座二歧,花柱上存在初级(顶端)柱头和次级(中柱)柱头,仅见于 Sebaea 属(龙胆科)。早期的研究表明,次级柱头提供了自交的机制,这表明它可能确保了生殖的保障。* 在这里,我们测试了这个独特形态特征的单系性。我们使用贝叶斯方法推断了包含 96 个样本的核 DNA 系统发育,其中包括 Sebaea 属约 50%的物种。利用这个系统发育,我们使用简约法和似然法推断了关键节点上祖先状态的分布。* 推断的 nrDNA 系统发育表明,Sebaea 属分为两个在统计学上得到很好支持的分支,A 和 B,与最近的估计一致。分支 A 的最接近共同祖先(MRCA),除了最基部的物种(Sebaea pusilla)之外,都是二歧胎座。在这个分支中没有观察到向单柱头的逆转。* 我们认为,胎座二歧性是随着时间的推移而进化稳定的。我们还讨论了为什么这种生殖系统只存在于龙胆科,以及胎座二歧性作为一种稳定的混合交配策略的潜在优势。

文献检索

告别复杂PubMed语法,用中文像聊天一样搜索,搜遍4000万医学文献。AI智能推荐,让科研检索更轻松。

立即免费搜索

文件翻译

保留排版,准确专业,支持PDF/Word/PPT等文件格式,支持 12+语言互译。

免费翻译文档

深度研究

AI帮你快速写综述,25分钟生成高质量综述,智能提取关键信息,辅助科研写作。

立即免费体验