Correlates of hybridization in plants

Hybridization is a biological phenomenon increasingly recognized as an important evolutionary process in both plants and animals, as it is linked to speciation, radiation, extinction, range expansion and invasion, and allows for increased trait diversity in agricultural and horticultural systems. Estimates of hybridization frequency vary across taxonomic groups, and previous work has demonstrated that some plant groups hybridize more frequently than others. Here, we ask on a global scale whether hybridization is linked to any of 11 traits related to plant life history, reproduction, genetic predisposition, and environment or opportunity. Given that hybridization is not evenly distributed across the plant tree of life, we use phylogenetic generalized least squares regression models and phylogenetic path analysis to detect statistical associations between hybridization and plant traits at both the family and genus levels. We find that perenniality and woodiness are each weakly associated ...杂交（Hybridization）是一种生物学现象，如今愈发被认为是动植物界中重要的演化过程——它与物种形成、辐射演化、物种灭绝、分布范围扩张及生物入侵密切相关，同时可提升农业与园艺系统中的性状多样性。不同分类群间的杂交频率估算值存在差异，已有研究表明部分植物类群的杂交发生频率显著高于其他类群。本研究在全球尺度下探讨杂交是否与11项与植物生活史、繁殖、遗传倾向以及环境或机遇相关的性状存在关联。鉴于杂交在植物系统发育树中的分布并不均匀，本研究采用系统发育广义最小二乘回归模型（phylogenetic generalized least squares regression models）与系统发育路径分析（phylogenetic path analysis），在科与属两个分类层级上检测杂交与植物性状间的统计关联。本研究发现，多年生习性与木质化特性各自与杂交存在较弱的关联……