MdBZR1 regulates ABA response by modulating the expression of MdABI5 in apple

编号 040029602

推送时间 20210621

研究领域 森林培育 

年份 2021 

类型 期刊 

语种 英语

标题 MdBZR1 regulates ABA response by modulating the expression of MdABI5 in apple

来源期刊 Plant Cell Reports

期 第296期

发表时间 20210510

关键词 Apple (malusdomestica);  Brassinosteroids;  MdBZR1;  ABA sensitivity;  MdABI5; 

摘要 The plant hormones brassinosteroids (BRs) and abscisic acid (ABA) antagonistically regulate various aspects of plant growth and development. However, the association between BR and ABA signaling is less clear. Here, we identified MdBZR1 in apple (Malus domestica) and demonstrated that it was activated by BRs and could respond to ABA treatment. Overexpression of MdBZR1 in apple calli and Arabidopsis reduced ABA-hypersensitive phenotypes, suggesting that MdBZR1 negatively regulates ABA signaling. Subsequently, we found that MdBZR1 directly bound to the promoter region of MdABI5 and suppressed its expression. MdABI5 was significantly induced by ABA treatment. And overexpression of MdABI5 in apple calli increased sensitivity to ABA. Ectopic expression of MdABI5 in Arabidopsis inhibited seed germination and seedling growth. In addition, overexpression of MdBZR1 partially attenuated MdABI5-mediated ABA sensitivity. Taken together, our data indicate that MdBZR1 directly binds to the promoter of MdABI5 and suppresses its expression to antagonistically mediate ABA response. Our work contributes to the functional studies of BZR1 and further broadens the insight into the between BR and ABA signaling.

服务人员 孙小满

服务院士 尹伟伦

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