Working group session:
Breeding and Applied Genomics
Presentation type:
oral
Authors:
Rong, Ying; Zhang, Meiping; Lee, Mi-Kyung; Stelly, David M. ; Zhang, Hong-Bin
Presenter:
Zhang, Hong-Bin
Correspondent:
Zhang, Hong-Bin
Abstract:
Studies in the phylogeny and genomic origin of a species provide knowledge of its genetic composition, genetic behavior and amenability to genetic improvement, and facilitate studies of its structural, evolutionary and functional genomics. Cotton, a major crop of global importance, has been studied extensively in these regards using morphological, cytological and lately, molecular tools. The phylogenetic tree of cotton and related species has been well-established, but the origin of the polyploid cotton AD genome (A and D subgenomes) is not entirely clear. To help address this long-standing problem, we re-investigated the phylogeny of the Gossypium species and the origin of the A-subgenome and D-subgenome of the polyploid AD-genome cottons by genome-wide analysis of the Gossypium species. The phylogenetic tree reconstructed in this study largely agrees with that currently available, but differences in recent species branching were observed. The results rejected the hypothesis that the D-subgenome of extant AD-genome species arose from any known extant D-genome diploid species, including G. raimondii (D5) and G. gossypioides (D6); likewise, the A-subgenome of extant AD-genome species did not originate from any extant A-genome diploid species. Our results indicated that the AD-genome species arose before split among the extant A-genome species, and before split among the extant D-genome species. These results provide new information about cotton speciation and evolution, and new knowledge for enhanced cotton genomics and genetics research and breeding.