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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >CHLOROPLAST DNA VARIATION AND THE RECENT RADIATION OF THE GIANT SENECIOS (ASTERACEAE) ON THE TALL MOUNTAINS OF EASTERN AFRICA
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CHLOROPLAST DNA VARIATION AND THE RECENT RADIATION OF THE GIANT SENECIOS (ASTERACEAE) ON THE TALL MOUNTAINS OF EASTERN AFRICA

机译：东部非洲高山区叶绿体DNA的变化和巨无脊椎动物（菊科）的最近辐射

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Chloroplast DNA restriction-site variation was surveyed among 40 accessions representing all 11 species of giant senecios (Dendrosenecio, Asteraceae) at all but one known location, plus three outgroup species. Remarkably little variation (only 9 variable sites out of roughly 1000 sites examined) was found among the 40 giant senecio accessions, yet as a group they differ significantly (at 18 sites) from Cineraria deltoidea, the closest known relative. This pattern indicates that the giant senecios underwent a recent dramatic radiation in eastern Africa and evolved from a relatively isolated lineage within the Senecioneae. Biogeographic interpretation of the molecular phylogeny suggests that the giant senecios originated high on Mt. Kilimanjaro, with subsequent dispersion to the Aberdares, Mt. Kenya, and the Cherangani Hills, followed by dispersion westward to the Ruwenzori Mountains, and then south to the Virunga Mountains, Mt. Kahuzi, and Mt. Muhi, but with dispersion back to Mt. Elgon. Geographic radiation was an important antecedent to the diversification in eastern Africa, which primarily involved repeated altitudinal radiation, both up and down the mountains, leading to morphological parallelism in both directions. In general, the plants on a given mountain are more closely related to each other than they are to plants on other mountains, and plants on nearby mountains are more closely related to each other than they are to plants on more distant mountains. The individual steps of the geographic radiation have occurred at various altitudes, some clearly the result of intermountain dispersal, The molecular evidence suggests that two species are extant ancestors to other species on the same or nearby mountains. [References: 30]
机译：在代表一个已知位置的所有11种巨型千里光目（Dendrosenecio，Asteraceae）的40个种质中，对叶绿体DNA限制性位点的变异进行了调查，除了一个已知位置外，还有三个外群种。在40个千叶千里光种质中，几乎没有发现变异（仅在检测的1000个位点中只有9个可变位点），但作为一个组，它们与最接近的亲缘种瓜叶菊（Ceneraria deltoidea）有显着差异（在18个位点）。这种模式表明，巨大的千里光在东部非洲经历了近期的剧烈辐射，并从千里光内的一个相对孤立的世系演化而来。分子系统发育的生物地理学解释表明，巨大千里光起源于山顶。乞力马扎罗山，随后分散到阿伯达雷斯山。肯尼亚和Cherangani丘陵，然后向西扩散至Ruwenzori山脉，再向南扩散至维伦加山脉。卡胡兹和山Muhi，但是分散回到山。埃尔贡地理辐射是东部非洲多样化的重要前提，它主要涉及重复的海拔辐射，无论是在山上还是在山下，都导致两个方向的形态平行。通常，给定山上的植物彼此之间的联系比与其他山上的植物之间的联系更紧密，而附近山上的植物相互之间的联系比与更远山上的植物之间的联系更紧密。地理辐射的各个步骤都发生在不同的高度，这显然是山间扩散的结果。分子证据表明，两个物种是同一或附近山脉上其他物种的现存祖先。 [参考：30]

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