Genome-wide bioinformatics analysis reveals the evolutionary origin of BnGRAS genes in the Brassica genus

文献类型： 外文期刊

第一作者： Xie, Zhengqing

作者： Xie, Zhengqing;Tian, Zhaoran;Wei, Fei;Tian, Baoming;Wei, Fang;Chen, Weiwei;Cao, Gangqiang;Shi, Gongyao;Tian, Zhaoran;Wei, Fang;Wei, Xiaochun

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关键词： GRAS family; Brassica napus; Whole genome duplication; Whole genome triplication; Tandem duplication; Allopolyploidization

期刊名称：GENETIC RESOURCES AND CROP EVOLUTION （ 影响因子：1.876； 五年影响因子：1.864 ）

ISSN： 0925-9864

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收录情况： SCI

摘要： As important plant-specific transcription factors, GRAS family members play significant roles in plant development and diverse stress responses. The identification of GRAS genes in many species has been explored; however, little is known about the evolutionary origin of GRAS genes of Brassica napus (BnGRAS genes or BnGRASs)Brassica napus (BnGRAS genes or BnGRASs) in the Brassica genus. Here, 56, 53 and 96 GRAS genes were identified in Brassica rapa, Brassica oleracea, and B. napus, respectively, which were classified into 13 subfamilies and 17 orthologous groups by phylogenetic analysis. Duplication analysis showed that the Brassica-alpha whole genome triplication event contributed more to the expansion of BnGRAS genes than allopolyploidization and tandem duplication. Moreover, all Brassica GRAS genes were estimated to have undergone purifying selection during their evolution. Additionally, structural feature and expression profile analyses indicated that GRAS genes were conserved in sequence characters within the same subfamily, suggesting similar functions in plant development and biotic and abiotic stress responses. Finally, the evolutionary origin of BnGRASs in the Brassica genus was proposed. Taken together, this study not only deduces the evolutionary origin of BnGRASs in the Brassica genus but also provides important candidate BnGRAS genes for further functional analysis.

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