The chrysanthemum DEAD-box RNA helicase CmRH56 regulates rhizome outgrowth in response to drought stress

文献类型： 外文期刊

第一作者： Zhang, Lili

作者： Zhang, Lili;Xu, Yanjie;Liu, Xuening;Qin, Meizhu;Li, Shenglan;Jiang, Tianhua;Yang, Yingjie;Gao, Junping;Hong, Bo;Ma, Chao;Jiang, Cai-Zhong;Jiang, Cai-Zhong;Zhang, Lili

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关键词： Chrysanthemum morifolium; CmGA2ox6; CmRH56; DEAD-box RNA helicase; drought stress; rhizome

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：7.298； 五年影响因子：8.291 ）

ISSN： 0022-0957

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收录情况： SCI

摘要： Chrysanthemum DEAD-box RNA helicase CmRH56 influences the gibberellin metabolic pathway to modulate rhizome outgrowth in response to drought stress. Plants have evolved complex mechanisms to reprogram growth in response to drought stress. In herbaceous perennial plant species, the rhizome, which is normally an organ for propagation and food storage, can also support plant growth in stressful environments, and allows the plant to perennate and survive stress damage. However, the mechanisms that regulate rhizome growth in perennial herbs during abiotic stresses are unknown. Here, we identified a chrysanthemum (Chrysanthemum morifolium) DEAD-box RNA helicase gene, CmRH56, that is specifically expressed in the rhizome shoot apex. Knock down of CmRH56 transcript levels decreased the number of rhizomes and enhanced drought stress tolerance. We determined that CmRH56 represses the expression of a putative gibberellin (GA) catabolic gene, GA2 oxidase6 (CmGA2ox6). Exogenous GA treatment and silencing of CmGA2ox6 resulted in more rhizomes. These results demonstrate that CmRH56 suppresses rhizome outgrowth under drought stress conditions by blocking GA biosynthesis.

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