Genome-wide identification, expression analysis of GH3 family genes in Medicago truncatula under stress-related hormones and Sinorhizobium meliloti infection

文献类型： 外文期刊

第一作者： Yang, Yanjun

作者： Yang, Yanjun;Sun, Tao;Zeng, Houqing;Wang, Huizhong;Shen, Chenjia;Yue, Runqing;Zhang, Lei;Chen, Wei

作者机构：

关键词： Auxin;Auxin signaling;GH3 gene family;Medicago truncatula;Sinorhizobium meliloti;Phytohormone

期刊名称：APPLIED MICROBIOLOGY AND BIOTECHNOLOGY （ 影响因子：4.813； 五年影响因子：4.697 ）

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收录情况： SCI

摘要： Auxin plays a pivotal role in the regulation of plant growth and development by controlling the expression of auxin response genes rapidly. As one of the major auxin early response gene families, Gretchen Hagen 3 (GH3) genes are involved in auxin homeostasis by conjugating excess auxins to amino acids. However, how GH3 genes function in environmental stresses and rhizobial infection responses in Medicago truncatula are largely unknown. Here, based on the latest updated M. truncatula genome, a comprehensive identification and expression profiling analysis of MtGH3 genes were performed. Our data showed that most of MtGH3 genes were expressed in tissue-specific manner and were responsive to environmental stress-related hormones. To understand the possible roles of MtGH3 genes involved in symbiosis establishment between M. truncatula and symbiotic bacteria, quantitative real-time polymerase chain reaction (qRT-PCR) was used to test the expressions of MtGH3 genes during the early phase of Sinorhizobium meliloti infection. The expression levels of most MtGH3 genes were upregulated in shoots and downregulated in roots by S. meliloti infection. The differences in expression responses to S. meliloti infection between roots and shoots were in agreement with the results of free indoleacetic acid (IAA) content measurements. The identification and expression analysis of MtGH3 genes at the early phase of S. meliloti infection may help us to understand the role of GH3-mediated IAA homeostasis in the regulation of nodule formation in model legumes M. truncatula.

分类号： Q939.9`Q81

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