Origin and Evolution of Allopolyploid Wheatgrass Elymus fibrosus Schrenk Tzvelev Poaceae: Triticeae Reveals the Effect of Its Origination on Genetic DiversityReportar como inadecuado




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Origin and evolution of tetraploid Elymus fibrosus Schrenk Tzvelev were characterized using low-copy nuclear gene Rpb2 the second largest subunit of RNA polymerase II, and chloroplast region trnL–trnF spacer between the tRNA Leu UAA gene and the tRNA-Phe GAA gene. Ten accessions of E. fibrosus along with 19 Elymus species with StH genomic constitution and diploid species in the tribe Triticeae were analyzed. Chloroplast trnL–trnF sequence data suggested that Pseudoroegneria St genome was the maternal donor of E. fibrosus. Rpb2 data confirmed the presence of StH genomes in E. fibrosus, and suggested that St and H genomes in E. fibrosus each is more likely originated from single gene pool. Single origin of E. fibrosus might be one of the reasons causing genetic diversity in E. fibrosus lower than those in E. caninus and E. trachycaulus, which have similar ecological preferences and breeding systems with E. fibrosus, and each was originated from multiple sources. Convergent evolution of St and H copy Rpb2 sequences in some accessions of E. fibrosus might have occurred during the evolutionary history of this allotetraploid.



Autor: De-Chuan Wu , Deng-Min He , Hai-Lan Gu, Pan-Pan Wu, Xu Yi, Wei-Jie Wang, Han-Feng Shi, De-Xiang Wu , Genlou Sun

Fuente: http://plos.srce.hr/



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