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首页> 外文期刊>The Botanical Review >Molecular Phylogenetics and Biogeography of the Caribbean-Centered Croton Subgenus Moacroton (Euphorbiaceae s.s.)
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Molecular Phylogenetics and Biogeography of the Caribbean-Centered Croton Subgenus Moacroton (Euphorbiaceae s.s.)

机译：以加勒比海为中心的巴豆亚属（Auphorbiaceae s.s.）的分子系统发生学和生物地理学

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Initial molecular phylogenetic studies established the monophylly of the large genus Croton (Euphorbiaceae s.s.) and suggested that the group originated in the New World. A denser and more targeted sampling of Croton species points to a South American origin for the genus. The nuclear and chloroplast genomes indicate a different rooting for the phylogeny of Croton. Although we favor the rooting indicated by the chloroplast data our conclusions are also consistent with the topology inferred from the nuclear data. The satellite genera Cubacroton and Moacroton are embedded within Croton. These two genera are synonimized into Croton and a new subgenus, Croton subgenus Moacroton, is circumscribed to include them and their allied Croton species. Croton subgenus Moacroton is morphologically characterized by a primarily lepidote indumentum, bifid or simple styles, and pistillate flowers with sepals that are connate at the base. This newly circumscribed subgenus is found from North America to South America, and in contrast to the majority of Croton species most of its members are found in mesic habitats. The group is most diverse in the greater Caribbean basin. A molecular clock was calibrated to the phylogeny using the available Euphorbiaceae fossils. The timing and pattern of diversification of Croton is consistent with both the GAARlandia and Laurasian migration hypotheses. A single species, Croton poecilanthus from Puerto Rico, is placed incongruently by its nuclear and chloroplast genomes. The possibility of this species being of hybrid origin is discussed.
机译：最初的分子系统发育研究建立了大巴豆属（Euphorbiaceae s.s.）的单系，并建议该组起源于新大陆。巴豆物种的更密集和更有针对性的采样指向该属的南美起源。核和叶绿体基因组表明巴豆系统发育的不同根源。尽管我们赞成叶绿体数据表明的生根，但我们的结论也与核数据推断的拓扑结构一致。卫星属Cubacroton和Moacroton被嵌入Croton中。这两个属被同化为巴豆属，并且新的亚属Moacroton的巴豆属被限定为包括它们和它们的巴豆属。巴豆属Moacroton的形态特征是主要为鳞翅目硬毛，两裂或简单花柱形，以及具萼片的雌蕊花在基部合生。这个新近限定的亚属是从北美到南美发现的，与大多数巴豆物种相反，其大部分成员都在中生生境中发现。该群体在大加勒比海盆地中最为多样化。使用可获得的大戟科植物化石将分子钟校准到系统发育。巴豆多样化的时机和方式与GAARlandia和Laurasian移民假说是一致的。单个物种，来自波多黎各的巴豆（Croton poecilanthus），通过其核和叶绿体基因组不一致地放置。讨论了该物种是杂种起源的可能性。

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