文献类型： 外文期刊

作者： Guo, Guo-Ye ¹ ; Chen, Fang ¹ ; Shi, Xiao-Dong ¹ ; Tian, Yin-Shuai ¹ ; Yu, Mao-Qun ² ; Han, Xue-Qin ³ ; Yuan, Li-Chun ³ ;

作者机构： 1.Sichuan Univ, Coll Life Sci, Minist Educ, Key Lab Bioresources & Ecoenvironm, Chengdu 610064, Sichuan, Peoples R China

2.Chinese Acad Sci, Chengdu Inst Biol, Chengdu 610041, Sichuan, Peoples R China

3.Yunnan Acad Agr Sci, Trop Ecoagr Inst, Yuanmou 651300, Yunnan, Peoples R China

4.Hainan Normal Univ, Coll Life Sci, Haikou 571158, Hainan, Peoples R China

关键词： Jatropha curcas;nrITS;Genetic variation;Phylogenetic relationship;Migration route

期刊名称：COMPTES RENDUS BIOLOGIES （ 影响因子：1.583； 五年影响因子：2.123 ）

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收录情况： SCI

摘要： Genetic variation and phylogenetic relationships among 102 Jatropha curcas accessions from Asia, Africa, and the Americas were assessed using the internal transcribed spacer region of nuclear ribosomal DNA (nrDNA ITS). The average G + C content (65.04%) was considerably higher than the A + T (34.96%) content. The estimated genetic diversity revealed moderate genetic variation. The pairwise genetic divergences (GD) between haplotypes were evaluated and ranged from 0.000 to 0.017, suggesting a higher level of genetic differentiation in Mexican accessions than those of other regions. Phylogenetic relationships and intraspecific divergence were inferred by Bayesian inference (BI), maximum parsimony (MP), and median joining (MJ) network analysis and were generally resolved. The J. curcas accessions were consistently divided into three lineages, groups A, B, and C, which demonstrated distant geographical isolation and genetic divergence between American accessions and those from other regions. The MJ network analysis confirmed that Central America was the possible center of origin. The putative migration route suggested that J. curcas was distributed from Mexico or Brazil, via Cape Verde and then split into two routes. One route was dispersed to Spain, then migrated to China, eventually spreading to southeastern Asia, while the other route was dispersed to Africa, via Madagascar and migrated to China, later spreading to southeastern Asia. (C) 2016 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.