Molecular phylogeny of RNA polymerase II gene reveals the relationships of tetraploid species with St genome (Triticeae: Poaceae) |
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| Authors: | Jin-Qiu liao Xing Fan Hai-Qin Zhang Li-Na Sha Hou-Yang Kang Xiao-Li Wang Jing Liu Yong-Hong Zhou |
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| Institution: | 1. Triticeae Research Institute, Sichuan Agricultural University, ChengDu, Wenjiang 611130, Sichuan, China;2. Key Laboratory of Crop Genetic Resources and Improvement, Ministry of Education, Sichuan Agricultural University, Wenjiang 611130, Sichuan, China;3. College of Biology and Science, Sichuan Agricultural University, Yaan 625014, Sichuan, China |
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| Abstract: | To evaluate phylogeny of tetraploid with St genome, phylogenetic analyses of RNA polymerase II (RPB2), a member of the nuclear gene family encoding the second largest subunit, were performed. Our results showed that: (1) Roegneria magnicaespes and Roegneria alashanica are related to Pseudoroegneria. (2) Roegneria elytrigioides has StStStSt genomes and should therefore be classified as Pseudoroegneria elytrigioides. (3) Pseudoroegneria tauri and Pseudoroegneria deweyi which have StStPP genomes should be transferred to Douglasdeweya and be renamed as Douglasdeweya wangii and Douglasdeweya deweyi, respectively. (4) Pseudoroegneria geniculata ssp. scythica is related to Pseudoroegneria and Lophyrum, and hence should be identified as a species of Trichopyrum. (5) Pseudoroegneria libanotica might be a parental donor for Elytrigia caespitosa rather than Elytrigia caespitosa ssp. nodosa. It is unreasonable to recognize El. caespitosa ssp. nodosa as a subspecies of El. caespitosa. (6) Interspecific and intergeneric variations are detected in St genome of these tetraploid species. |
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