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

被引:15
作者
Zhou, Xincheng [1 ]
Yang, Xinming [1 ]
Li, Xiuquan [1 ]
Li, Lihui [1 ]
机构
[1] Chinese Acad Agr Sci, Inst Crop Sci, Natl Key Facil Crop Gene Resources & Genet Improv, Beijing 100081, Peoples R China
关键词
Leymus; Psathyrostachys; rpoA; rbcL; DMC1; Genome origins; PHYLOGENETIC ANALYSIS; GENE; ELYMUS; PSATHYROSTACHYS; WHEAT; SEQUENCES; INTROGRESSION; CONSTITUTION; SENSITIVITY; MULTICAULIS;
D O I
10.1007/s00606-010-0341-y
中图分类号
Q94 [植物学];
学科分类号
071001 ;
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.
引用
收藏
页码:165 / 179
页数:15
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