Genome-Wide Identification of the RR Gene Family and Its Expression Analysis in Response to TDZ Induction in Rhododendron delavayi

文献类型： 外文期刊

第一作者： Peng, Lvchun

作者： Peng, Lvchun;Zhao, Zhengxiong;Peng, Lvchun;Xie, Weijia;Zhang, Lu;Song, Jie;Li, Shifeng;Li, Xuejiao;Gao, Yan;Zhao, Zhengxiong

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关键词： Rhododendron delavayi; adventitious bud regeneration; RR gene family; segmental replication

期刊名称：PLANTS-BASEL （ 影响因子：4.5； 五年影响因子：4.8 ）

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年卷期： 2023 年 12 卷 18 期

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收录情况： SCI

摘要： The cytokinin response regulator (RR) gene is essential for cytokinin signal transduction, which plays a crucial role in plant growth and development. Here, we applied bioinformatics to Rhododendron delavayi's genome to identify its RR gene family and systematically analyzed their gene characteristics, phylogenetic evolution, chromosomal localization, collinearity analysis, promoter cis-elements, and expression patterns. Overall, 33 RdRR genes were distinguished and classified into three types. All these genes harbored motif 5 (YEVTTVNSGLEALELLRENKB), the most conserved one, along with the plant-conserved domain (REC domain), and could be mapped to 10 chromosomes with four gene pairs of segmental replication events but no tandem replication events; 13 RdRR genes showed collinearity with Arabidopsis thaliana genes. Promoter analysis revealed multiple hormone-related cis-elements in the RR genes. After a TDZ (thidiazuron) treatment, 13 genes had higher expression levels than the control, whose magnitude of change depended on the developmental stage of leaves' adventitious buds. The expression levels of RdRR14, RdRR17, RdRR20, and RdRR24 agreed with the average number of adventitious buds post-TDZ treatment. We speculate that these four genes could figure prominently in bud regeneration from R. delavayi leaves in vitro. This study provides detailed knowledge of RdRRs for research on cytokinin signaling and RdRR functioning in R. delavayi.

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