Genome-wide characterization of GRAS family genes in Medicago truncatula reveals their evolutionary dynamics and functional diversification

文献类型： 外文期刊

第一作者： Zhang, Hailing

作者： Zhang, Hailing;Hu, Baozhong;Zhang, Hailing;Shang, Chen;Lie, Jikai;Wang, Jianli;Zhang, Hailing;Cao, Yingping;Wu, Zhenying;Ma, Lichao;Qi, Tianxiong;Fu, Chunxiang;Bai, Zetao;Cao, Yingping;Wu, Zhenying;Ma, Lichao;Qi, Tianxiong;Fu, Chunxiang;Bai, Zetao;Hu, Baozhong

作者机构：

期刊名称：PLOS ONE （ 影响因子：3.24； 五年影响因子：3.788 ）

ISSN： 1932-6203

年卷期： 2017 年 12 卷 9 期

页码：

收录情况： SCI

摘要： The GRAS gene family is a large plant-specific family of transcription factors that are involved in diverse processes during plant development. Medicago truncatula is an ideal model plant for genetic research in legumes, and specifically for studying nodulation, which is crucial for nitrogen fixation. In this study, 59 MtGRAS genes were identified and classified into eight distinct subgroups based on phylogenetic relationships. Motifs located in the C-termini were conserved across the subgroups, while motifs in the N-termini were subfamily specific. Gene duplication was the main evolutionary force for MtGRAS expansion, especially proliferation of the LISCL subgroup. Seventeen duplicated genes showed strong effects of purifying selection and diverse expression patterns, highlighting their functional importance and diversification after duplication. Thirty MtGRAS genes, including NSP1 and NSP2, were preferentially expressed in nodules, indicating possible roles in the process of nodulation. A transcriptome study, combined with gene expression analysis under different stress conditions, suggested potential functions of MtGRAS genes in various biological pathways and stress responses. Taken together, these comprehensive analyses provide basic information for understanding the potential functions of GRAS genes, and will facilitate further discovery of MtGRAS gene functions.

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