Genome origins in Leymus (Poaceae: Triticeae): evidence of maternal and paternal progenitors and implications for reticulate evolution

文献类型： 外文期刊

第一作者： Zhou, Xincheng

作者： Zhou, Xincheng;Yang, Xinming;Li, Xiuquan;Li, Lihui

作者机构：

关键词： Leymus;Psathyrostachys;rpoA;rbcL;DMC1;Genome origins;Internet resource.

期刊名称：PLANT SYSTEMATICS AND EVOLUTION （ 影响因子：1.631； 五年影响因子：1.704 ）

ISSN：

年卷期：

页码：

收录情况： SCI

摘要： The polyploid Leymus species have the Ns nuclear genomes evolved from Psathyrostachys and the Xm nuclear genomes from unknown origins. Currently, little is known about the cytoplasmic genomes of Leymus, and the species of Psathyrostachys that transferred the Ns genome to Leymus remain elusive. To determine the origins of the plastid and nuclear genome for Leymus species, sequences of two chloroplast genes, rpoA and rbcL, and partial sequences of the nuclear gene DMC1 of 15 Leymus species were phylogenetically analyzed with those of 71 accessions belonging to 19 monogenomic genera in Triticeae. Both rpoA and rbcL sequences revealed that Psathyrostachys juncea, P. lanuginosa, and P. stoloniformis had close phylogenetic relationships with the Eurasian and one North American Leymus accessions, L. cinereus. Three American Leymus species, L. erianthus, L. triticoides, and L. innovatus had different maternal origins from Eurasian Leymus species. DMC1 sequences of Leymus were grouped into several phylogenetically distant clades indicating that either Ns or Xm originated from different lineages. These results suggest multiple contributions to the chloroplast as well as nuclear genomes in Leymus species. The comprehensive data indicate reticulate evolution in polyploid Leymus.

分类号： Q94

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