Comparative genomics reveals the molecular mechanism of salt adaptation for zoysiagrasses

作者：Wei Wang, An Shao, Xiao Xu, Shugao Fan, Jinmin Fu · 发表于：BMC Plant Biology · 年份：2022 · DOI：10.1186/s12870-022-03752-0 · 被引用次数：21 · 研究领域：Turfgrass Adaptation and Management、Plant Stress Responses and Tolerance、Plant responses to water stress

BACKGROUND: Zoysiagrass (Zoysia spp.) is a warm-season turfgrass. It is widely used as turfgrasses throughout the world, offers good turf qualities, including salt tolerance, resistance to drought and heat. However, the underlying genetic mechanism of zoysiagrass responsive to salt stress remains largely unexplored. RESULTS: In present study, we performed a whole-genome comparative analysis for ten plant genomes. Evolutionary analysis revealed that Chloridoideae diverged from Panicoideae approximately 33.7 million years ago (Mya), and the phylogenetic relationship among three zoysiagrasses species suggested that Zoysia matrella may represent an interspecific hybrid between Zoysia japonica and Zoysia pacifica. Genomic synteny indicated that Zoysia underwent a genus-specific whole-genome duplication (WGD) event approximately 20.8 Mya. The expression bais of homologous genes between the two subgenomes suggested that the B subgenome of Z. japonica contributes to salt tolerance. In additon, comparative genomic analyses revealed that the salt adaptation of Zoysia is likely attributable to the expanded cytochrome P450 and ABA biosynthetic gene families. Furthermore, we further found that many duplicated genes from the extra WGD event exhibited distinct functional divergence in response to salt stress using transcriptomic analysis, suggesting that this WGD event contributed to strong resistance to salt stress. CONCLUSIONS: Here, our results revealed that expanded cytochrome P450 and ...