Open AccessOrigin and Evolution of Allopolyploid Wheatgrass Elymus fibrosus (Schrenk) Tzvelev (Poaceae: Triticeae) Reveals the Effect of Its Origination on Genetic Diversity
Author(s) -
De-Chuan Wu,
Deng-Min He,
Hai-Lan Gu,
Panpan Wu,
Ye Xu,
Weijie Wang,
Han-Feng Shi,
De-Xiang Wu,
Genlou Sun
Publication year - 2016
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0167795
Subject(s) - triticeae , elymus , biology , genetic diversity , ploidy , chloroplast dna , genome , evolutionary biology , botany , genetics , gene , poaceae , population , demography , sociology
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.