Evolution of the Drosophila obscura species group inferred from the Gpdh and Sod genes
Evolution of the Drosophila obscura species group inferred from the Gpdh and Sod genes
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DOI：
10.1006/mpev.1996.0375
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发表时间：
1997-02-01
影响因子：
4.1
通讯作者：
Ayala, FJ
中科院分区：
文献类型：
--
作者：
Barrio, E;Ayala, FJ
暗箱果蝇群由几十个新北极和古北极物种组成，尽管进行了大量形态学、细胞遗传学和分子学研究，但其系统发育仍未得到很大程度上的解决。为了解决这一问题，我们对12-13个物种和1个亚种的Gpdh（约1000 bp）和Sod（约700 bp）两个基因进行了部分测序。解决系统发育的困难来自于连续辐射的快速序列。尽管如此，以下结论是有根据的：(1)古北区种包括两个单系亚群，即亚bobscura（可能是整个类群中最古老的分支）和暗箱，以及另外两个未确定系统发育位置的种，D. bifasciata和D. subsilvestris；(2)新北极种形成了一个单系群，由两个单系姐妹枝，亲缘亚群和伪丛亚群组成。古北辐射可能是对旧大陆温带森林扩张的适应所致。第二次辐射发生在新世界落叶森林的殖民时期，由一个单一谱系的后代组成，这个谱系很快分裂成亲缘和伪矮树亚群。(C) 1997学术出版社。
The Drosophila obscura group consists of several dozen Nearctic and Palearctic species, with a phylogeny that remains largely unresolved in spite of numerous morphological, cytogenetic, and molecular investigations. We have partially sequenced two genes, Gpdh (about 1000 bp) and Sod (about 700 bp) in 12-13 species and 1 subspecies in order to settle the issues. Difficulties in resolving the phylogeny emanate from the rapid sequence of successive radiations. Nevertheless, the following conclusions are warranted: (1) The Palearctic species include two monophyletic subgroups, subobscura (which may be the most ancient clade of the whole group) and obscura, plus two other species with unresolved phylogenetic positions, D. bifasciata and D. subsilvestris; (2) the Nearctic species form a monophyletic group consisting of two monophyletic sister clades, the affinis subgroup and the pseudoobscura subgroup. The Palearctic radiation may have resulted from adaptation to expanding temperate forests in the Old World. A second radiation occurred during the colonization of the deciduous forests of the New World by the descendants of a single lineage that soon split into the affinis and pseudoobscura subgroups. (C) 1997 Academic Press.