Patterns of Evolutionary Conservation of Ascorbic Acid-Related Genes Following Whole-Genome Triplication in Brassica rapa

文献类型： 外文期刊

第一作者： Duan, Weike

作者： Duan, Weike;Song, Xiaoming;Liu, Tongkun;Huang, Zhinan;Ren, Jun;Hou, Xilin;Du, Jianchang;Li, Ying;Du, Jianchang

作者机构：

关键词： AsA-related genes;Brassica rapa;evolutionary conservation;synteny analysis;gene dosage hypothesis;expression pattern

期刊名称：GENOME BIOLOGY AND EVOLUTION （ 影响因子：3.416； 五年影响因子：4.079 ）

ISSN： 1759-6653

年卷期： 2015 年 7 卷 1 期

页码：

收录情况： SCI

摘要： Ascorbic acid (AsA) is an important antioxidant in plants and an essential vitamin for humans. Extending the study of AsA-related genes from Arabidopsis thaliana to Brassica rapa could shed light on the evolution of AsA in plants and inform crop breeding. In this study, we conducted whole-genome annotation, molecular-evolution and gene-expression analyses of all known AsA-related genes in B. rapa. The nucleobase-ascorbate transporter (NAT) gene family and AsA l-galactose pathway genes were also compared among plant species. Four important insights gained are that: 1) 102 AsA-related gene were identified in B. rapa and they mainly diverged 12-18 Ma accompanied by the Brassica-specific genome triplication event; 2) during their evolution, these AsA-related genes were preferentially retained, consistent with the gene dosage hypothesis; 3) the putative proteins were highly conserved, but their expression patterns varied; and 4) although the number of AsA-related genes is higher in B. rapa than in A. thaliana, the AsA contents and the numbers of expressed genes in leaves of both species are similar, the genes that are not generally expressed may serve as substitutes during emergencies. In summary, this study provides genome-wide insights into evolutionary history and mechanisms of AsA-related genes following whole-genome triplication in B. rapa.

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