数字农科院2.0

24-Epibrassinolide Facilitates Adventitious Root Formation by Coordinating Cell-Wall Polyamine Oxidase- and Plasma Membrane Respiratory Burst Oxidase Homologue-Derived Reactive Oxygen Species in Capsicum annuum L.

文献类型： 外文期刊

作者： Wen, Zhengyang;Chen, Zhifeng;Liu, Xinyan;Sun, Jingbo;Zhang, Feng;Zhang, Mengxia;Dong, Chunjuan

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关键词： adventitious root;24-epibrassinolide;reactive oxygen species;polyamine oxidase;respiratory burst oxidase homologues;pepper

期刊名称： ANTIOXIDANTS

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年卷期： 2023 年 12 卷 7 期

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收录情况： SCIE（2023版）

摘要： Adventitious root (AR) formation is a critical process in cutting propagation of horticultural plants. Brassinosteroids (BRs) have been shown to regulate AR formation in several plant species; however, little is known about their exact effects on pepper AR formation, and the downstream signaling of BRs also remains elusive. In this study, we showed that treatment of 24-Epibrassinolide (EBL, an active BR) at the concentrations of 20-100 nM promoted AR formation in pepper (Capsicum annuum). Furthermore, we investigated the roles of apoplastic reactive oxygen species (ROS), including hydrogen peroxide (H2O2) and superoxide radical (O-2(& BULL;-)), in EBL-promoted AR formation, by using physiological, histochemical, bioinformatic, and biochemical approaches. EBL promoted AR formation by modulating cell-wall-located polyamine oxidase (PAO)-dependent H2O2 production and respiratory burst oxidase homologue (RBOH)-dependent O-2(& BULL;-) production, respectively. Screening of CaPAO and CaRBOH gene families combined with gene expression analysis suggested that EBL-promoted AR formation correlated with the upregulation of CaPAO1, CaRBOH2, CaRBOH5, and CaRBOH6 in the AR zone. Transient expression analysis confirmed that CaPAO1 was able to produce H2O2, and CaRBOH2, CaRBOH5, and CaRBOH6 were capable of producing O-2(& BULL;-). The silencing of CaPAO1, CaRBOH2, CaRBOH5, and CaRBOH6 in pepper decreased the ROS accumulation and abolished the EBL-induced AR formation. Overall, these results uncover one of the regulatory pathways for BR-regulated AR formation, and extend our knowledge of the functions of BRs and of the BRs-ROS crosstalk in plant development.

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