2025-12-11 中国科学院(CAS)
<関連情報>
- https://english.cas.cn/newsroom/research_news/life/202512/t20251211_1135965.shtml
- https://www.cell.com/current-biology/abstract/S0960-9822(25)01528-3
維管束植物の水生適応における収束的ゲノムダイナミズム The convergent genomic dynamism for aquatic adaptation in vascular plants
Ling-Yun Chen ∙ Jia-Le Wang ∙ Yu Cao ∙ … ∙ Chien-Hsun Huang ∙ Tao Wan, ∙ Qing-Feng Wang
Current Biology Published:December 9, 2025
DOI:https://doi.org/10.1016/j.cub.2025.11.026
Graphical abstract
Highlights
- Aquatic plants exhibit accelerated evolutionary rates versus their terrestrial relatives
- Substantial gene co-expansions feature in independent aquatic adaptations
- Stomatal gene copy number correlates with total stomatal area in aquatic plants
- Emergent/floating and submerged plants exhibited different waterlogging responses
Summary
Aquatic plants represent a specific evolutionary group that underwent multiple independent transitions from land to water. Compared with plant terrestrialization, the genomic dynamisms underlying aquatic adaptation remain largely unexplored. Here, we assembled high-quality genomes for eight aquatic species, including two freshwater-emergent, three freshwater-submerged, and three seagrass species. Incorporating comparisons of 122 vascular plant genomes, microscopic observations, and transcriptomic profiling, we pinpointed convergent genomic features underlying aquatic adaptations. Aquatic plants (especially freshwater-submerged species) were characterized by notably accelerated evolutionary rates compared with their terrestrial relatives, arguing against aquatic habitats having slowed down evolution. Unlike previous ideas of overrepresented gene loss but limited gene expansion, we revealed substantial co-expansion events in various aquatic lineages. The detailed gene-expansion pattern highlighted the distinct adaptive strategies of freshwater-submerged species compared with seagrasses. Beyond that, we uncovered entirely diverged transcriptional responses between freshwater-submerged and emergent/floating species when waterlogged, which provides new clues for improving crop flooding tolerance.
