Details

Autor(en) / Beteiligte

• Guo, Zhen-Hua
• Ma, Peng-Fei
• Yang, Guo-Qian
• Hu, Jin-Yong
• Liu, Yun-Long
• Xia, En-Hua
• Zhong, Mi-Cai
• Zhao, Lei
• Sun, Gui-Ling
• Xu, Yu-Xing
• Zhao, You-Jie
• Zhang, Yi-Chi
• Zhang, Yu-Xiao
• Zhang, Xue-Mei
• Zhou, Meng-Yuan
• Guo, Ying
• Guo, Cen
• Liu, Jing-Xia
• Ye, Xia-Ying
• Chen, Yun-Mei
• Yang, Yang
• Han, Bin
• Lin, Choun-Sea
• Lu, Ying
• Li, De-Zhu

Titel

Genome Sequences Provide Insights into the Reticulate Origin and Unique Traits of Woody Bamboos

Ist Teil von

• Molecular plant, 2019-10, Vol.12 (10), p.1353-1365

Ort / Verlag

England: Elsevier Inc

Erscheinungsjahr

2019

Quelle

MEDLINE

Beschreibungen/Notizen

• Polyploidization is a major driver of speciation and its importance to plant evolution has been well recognized. Bamboos comprise one diploid herbaceous and three polyploid woody lineages, and are members of the only major subfamily in grasses that diversified in forests, with the woody members having a tree-like lignified culm. In this study, we generated four draft genome assemblies of major bamboo lineages with three different ploidy levels (diploid, tetraploid, and hexaploid). We also constructed a high-density genetic linkage map for a hexaploid species of bamboo, and used a linkage-map-based strategy for genome assembly and identification of subgenomes in polyploids. Further phylogenomic analyses using a large dataset of syntenic genes with expected copies based on ploidy levels revealed that woody bamboos originated subsequent to the divergence of the herbaceous bamboo lineage, and experienced complex reticulate evolution through three independent allopolyploid events involving four extinct diploid ancestors. A shared but distinct subgenome was identified in all polyploid forms, and the progenitor of this subgenome could have been critical in ancient polyploidizations and the origin of woody bamboos. Important genetic clues to the unique flowering behavior and woody trait in bamboos were also found. Taken together, our study provides significant insights into ancient reticulate evolution at the subgenome level in the absence of extant donor species, and offers a potential model scenario for broad-scale study of angiosperm origination by allopolyploidization. Hybridization and polyploidization are major drivers of plant evolution. This study reveals an ancient reticulate origin of bamboos without extant donor species, representing a potential model case for angiosperm origination by allopolyploidization. Together with novel insights into the woody trait and unique flowering behavior of bamboos, these findings will greatly enhance further research into the model plant family Poaceae.