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Phylogenetic investigation of Avena diploid species and the maternal genome donor of Avena polyploids

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We investigated the species and genome relationships among 82 Avena accessions representing thirteen diploid species (A and C genomes), six tetraploids (AB and AC genomes) and four hexaploids (ACD genome) to infer the evolutionary pathways in Avena using the plastid matK gene and the trnL-F region. The matK and trnL-F sequences pointed to the A-genome diploid species as maternal parents of the polyploid species. Furthermore, different A-genome diploid species might have served as the A genome donor of several different polyploid species. The probable ancestor of most hexaploid species, of the AC-genome tetraploids, and of the AB-genome species A. agadiriana was A. wiestii (As genome). The likely donor of the other three AB- genome tetraploids was A. hirtula (also As genome) and A. damascena (Ad genome) appears to be the A genome donor of the hexaploid A. fatua. The A genome origin of A. fatua differs from that for the other hexaploid Avena species, which is different from the common assumption that the hexaploid species evolved from a single hexaploid ancestor followed by gain or loss of domestication genes. Thus, several separate maternal lineages might be involved in different polyploid species.


Document Type: Research Article

Publication date: October 1, 2010

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