首页|Genomic analysis of Nypa fruticans elucidates its intertidal adaptations and early palm evolution
Genomic analysis of Nypa fruticans elucidates its intertidal adaptations and early palm evolution
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Nypa fruticans(Wurmb),a mangrove palm species with origins dating back to the Late Cretaceous period,is a unique species for in-vestigating long-term adaptation strategies to intertidal environments and the early evolution of palms.Here,we present a chromosome-level genome sequence and assembly for N.fruticans.We integrated the genomes of N.fruticans and other palm family members for a comparative genomic analysis,which confirmed that the common ancestor of all palms experienced a whole-genome duplication event around 89 million years ago,shaping the distinctive characteristics observed in this clade.We also inferred a low mutation rate for the N.fruticans genome,which underwent strong purifying selection and evolved slowly,thus contributing to its stability over a long evolutionary period.Moreover,an-cient duplicates were preferentially retained,with critical genes having experienced positive selection,enhancing waterlogging tolerance in N.fruticans.Furthermore,we discovered that the pseudogenization of Early Methionine-labelled 1(EM1)and EM6 in N.fruticans underly its crypto-vivipary characteristics,reflecting its intertidal adaptation.Our study provides val-uable genomic insights into the evolutionary history,genome stability,and adaptive evolution of the mangrove palm.Our results also shed light on the long-term adaptation of this species and contribute to our understanding of the evo-lutionary dynamics in the palm family.
State Key Laboratory of Biocontrol and Guangdong Provincial Key Laboratory of Plant Resources,School of Life Sciences,Sun Yat-sen University,Guangzhou 510275,China
Greater Bay Area Institute of Precision Medicine,School of Life Sciences,Fudan University,Guangzhou 511462,China
Hainan Academy of Forestry(Hainan Academy of Mangrove),Haikou 571100,China
国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金Guangdong Basic and Applied Basic Research FoundationInnovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)
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