期刊
NEW PHYTOLOGIST
卷 227, 期 4, 页码 1249-1263出版社
WILEY
DOI: 10.1111/nph.16588
关键词
chromosome-level genome; differential gene retention; gene family expansion; karst habitat adaptation; Primulina huaijiensis; whole genome duplication
资金
- Strategic Priority Research Program of Chinese Academy of Sciences [XDB31000000]
- National Natural Science Foundation of China [U1501211, 31501799]
Although whole genome duplication (WGD) has been suggested to facilitate adaptive evolution and diversification, the role of specific WGD events in promoting diversification and adaptation in angiosperms remains poorly understood. Primulina, a species-rich genus with > 180 species associated with limestone karst habitat, constitutes an ideal system for studying the impact of WGD events on speciation and evolutionary adaptation. We sequenced and assembled a chromosome-level genome of the cave-dwelling species P. huaijiensis to study gene family expansion and gene retention following WGDs. We provide evidence that P. huaijiensis has undergone two WGDs since the gamma triplication event shared by all eudicots. In addition to a WGD shared by almost all Lamiales (L event), we identified a lineage-specific WGD (D event) that occurred in the early Miocene around 20.6-24.2 Myr ago and that is shared by almost the entire subtribe Didymocarpinae. We found that gene retentions following the D event led to gene family proliferation (e.g. WRKYs) that probably facilitated adaptation to the high salinity and drought stress in limestone karst. Our study highlights the role of lineage-specific WGD in species diversification and adaptation of plants from special habitats.
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