Phylogenetic analysis of questionable tetraploid species in Roegneria and Pseudoroegneria (Poaceae: Triticeae) inferred from a gene encoding plastid acety1-CoA carboxylase |
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Authors: | Chun Zhang Xing Fan Hai-Qing Yu Hai-Qin Zhang Xiao-Li Wang Yong-Hong Zhou |
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Affiliation: | aTriticeae Research Institute, Chengdu Academy of Sciences, Sichuan Agricultural University, Wenjiang 611130, Sichuan, PR China;bKey Laboratory of Crop Genetic Resources and Improvement, Ministry of Education, Sichuan Agricultural University, Yaan 625014, Sichuan, PR China;cDepartment of Biology and Science, Sichuan Agricultural University, Yaan 625014, Sichuan, PR China |
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Abstract: | To evaluate the phylogenetic relationships of questionable tetraploid species Roegneria alashanica Keng, Roegneria magnicaespes (D.F. Cui) L.B. Cai, Roegneria elytrigioides C. Yen et J.L. Yang, Roegneria grandis Keng and Pseudoroegneria geniculata (Trin.) Á. Löve, the single copy sequences of the plastid acetyl-CoA carboxylase gene (Acc1) were analyzed among the five species and the related diploid and tetraploid species. The results indicated that: (a) R. alashanica contained one set of modified St genome which was closely related to the Ee genome, and the other set of genome was closely related to the P genome; (b) R. magnicaespes contained one set of St genome, the other set of genome might be closely related to the P genome. There are close affinities between R. magnicaespes and R. alashanica; (c) R. elytrigioides contained two sets of St genomes, and it is reasonable to be treated as Pseudoreogneria elytrigioides (C. Yen et J.L. Yang) B.R. Lu; (d) the genome of R. grandis should be designed as StgY. The Stg genome was a differentiated form of the St genome in Pseudoroegneria and was homoeologous with the Y genome in Roegneria; (e) the genomic constitution of P. geniculata was similar to that of R. magnicaespes and R. alashanica and distinctly related to P. geniculata ssp. scythica (EeSt). They should be treated as different species in different genera; and (f) the Y genome was possibly originated from the St genome, and was sister to the St, Ee, Eb and W genomes. |
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Keywords: | Roegneria Pseudoroegneria Acetyl-CoA carboxylase gene (Acc1) Phylogenetic relationship Y genome Origin |
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