College of Life Science, Northwest Agriculture and Forest University, Yangling, Shaanxi, China.
J Plant Res. 2013 May;126(3):351-61. doi: 10.1007/s10265-012-0535-1. Epub 2012 Dec 14.
Prunus subgenus Padus is a group with a wide distribution in temperate eastern Asia and eastern North America with one species extending to Europe and one to Central America. Phylogenetic relationships of subgenus Padus were reconstructed using sequences of nuclear ribosomal ITS, and plastid ndhF gene, and rps16 intron and rpl16 intron. Prunus subgenus Padus is shown to be polyphyletic. Taxa of subgenus Padus and subgenus Laurocerasus are highly intermixed in both the ITS and the plastid trees. The results support two disjunctions between eastern North America and Eurasia within the Padus group. One disjunction is between Prunus virginiana of eastern North America and P. padus of Eurasia, estimated to have diverged at 2.99 (95 % HPD 0.59-6.15)-4.1 (95 % HPD 0.63-8.59) mya. The other disjunction is between P. serotina and its Asian relatives. The second disjunction may have occurred earlier than the former one, but the age estimate is difficult due to the unresolved phylogenetic position of the P. serotina complex.
李属矮樱组是一个分布广泛的东亚和北美东部群组，其中一个物种延伸到欧洲，一个延伸到中美洲。使用核核糖体 ITS、质体 ndhF 基因、rps16 内含子和 rpl16 内含子的序列重建了矮樱组的系统发育关系。结果表明，矮樱组是多系的。在 ITS 和质体树中，矮樱组和 Laurocerasus 组的分类群高度混杂。研究结果支持在矮樱组内存在两个与东亚和北美东部的间断。一个间断是北美东部的 P. virginiana 和欧亚大陆的 P. padus 之间的间断，估计分化时间在 2.99（95% HPD 0.59-6.15）到 4.1（95% HPD 0.63-8.59）百万年前。另一个间断是 P. serotina 和它的亚洲亲缘种之间的间断。第二个间断可能比前一个更早发生，但由于 P. serotina 复合体未解决的系统发育位置，因此很难估计其年龄。
