Feralization is an important evolutionary process,but the mechanisms behind it remain poorly understood.Here,we use the ancient fiber crop ramie(Boehmeria nivea(L.)Gaudich.)as a model to investigate genomic changes as...Feralization is an important evolutionary process,but the mechanisms behind it remain poorly understood.Here,we use the ancient fiber crop ramie(Boehmeria nivea(L.)Gaudich.)as a model to investigate genomic changes associated with both domestication and feralization.We first produced a chromosome-scale de novo genome assembly of feral ramie and investigated structural variations between feral and domesticated ramie genomes.Next,we gathered 915 accessions from 23 countries,comprising cultivars,major landraces,feral populations,and the wild progenitor.Based on whole-genome resequencing of these accessions,we constructed the most comprehensive ramie genomic variation map to date.Phylogenetic,demographic,and admixture signal detection analyses indicated that feral ramie is of exoferal or exo-endo origin,i.e.,descended from hybridization between domesticated ramie and the wild progenitor or ancient landraces.Feral ramie has higher genetic diversity than wild or domesticated ramie,and genomic regions affected by natural selection during feralization differ from those under selection during domestication.Ecological analyses showed that feral and domesticated ramie have similar ecological niches that differ substantially from the niche of the wild progenitor,and three environmental variables are associated with habitat-specific adaptation in feral ramie.These findings advance our understanding of feralization,providing a scientific basis for the excavation of new crop germplasm resources and offering novel insights into the evolution of feralization in nature.展开更多
基金supported by the CAS Strategic Priority Research Program(XDB31000000)the National Natural Science Foundation of China(31970356,42171071,32170398)+5 种基金the Yunnan Young&Elite Talents Projects(YNWR-QNBJ-2020-293,YNWR-QNBJ-2018-146)the Key Research Program of Frontier Sciences,the CAS(ZDBS-LY-7001)the CAS“Light of West China”Program(to Z.-Y.W.and J.L.),the Applied and Fundamental Research Foundation of Yunnan Province(202401AT070190)the CAS Youth Innovation Promotion Association(2019385)the Central Public-interest Scientific Institution Basal Research Fund(Y2023PT11)R.M.and M.C.also thank the CAS President’s International Fellowship Initiative for financial support(2022VBA0004 and 2020VBB0016,respectively).
文摘Feralization is an important evolutionary process,but the mechanisms behind it remain poorly understood.Here,we use the ancient fiber crop ramie(Boehmeria nivea(L.)Gaudich.)as a model to investigate genomic changes associated with both domestication and feralization.We first produced a chromosome-scale de novo genome assembly of feral ramie and investigated structural variations between feral and domesticated ramie genomes.Next,we gathered 915 accessions from 23 countries,comprising cultivars,major landraces,feral populations,and the wild progenitor.Based on whole-genome resequencing of these accessions,we constructed the most comprehensive ramie genomic variation map to date.Phylogenetic,demographic,and admixture signal detection analyses indicated that feral ramie is of exoferal or exo-endo origin,i.e.,descended from hybridization between domesticated ramie and the wild progenitor or ancient landraces.Feral ramie has higher genetic diversity than wild or domesticated ramie,and genomic regions affected by natural selection during feralization differ from those under selection during domestication.Ecological analyses showed that feral and domesticated ramie have similar ecological niches that differ substantially from the niche of the wild progenitor,and three environmental variables are associated with habitat-specific adaptation in feral ramie.These findings advance our understanding of feralization,providing a scientific basis for the excavation of new crop germplasm resources and offering novel insights into the evolution of feralization in nature.
