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Melatonin facilitates lateral root development by coordinating PAO-derived hydrogen peroxide and Rboh-derived superoxide radical

文献类型： 外文期刊

作者： Chen, Jian 1 ; Li, Hui 1 ; Yang, Kang 1 ; Wang, Yongzhu 1 ; Yang, Lifei 2 ; Hu, Liangbin 3 ; Liu, Ruixian 4 ; Shi, Zhiqi 1 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Food Safety & Nutr, 50 Zhongling St, Nanjing 210014, Jiangsu, Peoples R China

2.Nanjing Agr Univ, Coll Hort, Nanjing 210095, Jiangsu, Peoples R China

3.Henan Inst Sci & Technol, Dept Food Sci, Xinxiang 453003, Henan, Peoples R China

4.Jiangsu Acad Agr Sci, Inst Ind Crops, Nanjing 210014, Jiangsu, Peoples R China

关键词： Hydrogen peroxide; Lateral root; Melatonin; Polyamine oxidase; RBOH; Reactive oxygen species; Superoxide radical

期刊名称：FREE RADICAL BIOLOGY AND MEDICINE （ 影响因子：7.376； 五年影响因子：7.934 ）

ISSN： 0891-5849

年卷期： 2019 年 143 卷

页码：

收录情况： SCI

摘要： Melatonin, a phytochemical, can regulate lateral root (LR) formation, but the downstream signaling of melatonin remains elusive. Here we investigated the roles of hydrogen peroxide (H2O2) and superoxide radical (O-2(center dot-)) in melatonin-promoted LR formation in tomato (Solanum lycopersicum) roots by using physiological, histochemical, bioinformatic, and biochemical approaches. The increase in endogenous melatonin level stimulated reactive oxygen species (ROS)-dependent development of lateral root primordia (LRP) and LR. Melatonin promoted LRP/LR formation and modulated the expression of cell cycle genes (SlCDKA1, SlCYCD3;1, and SlKRP2) by stimulating polyamine oxidase (PAO)-dependent H2O2 production and respiratory burst oxidase homologue (Rboh)-dependent O-2(center dot-) production, respectively. Screening of SlPAOs and SlRbohs gene family combined with gene expression analysis suggested that melatonin-promoted LR formation was correlated to the upregulation of SlPAO1, SlRboh3, and SlRboh4 in LR-emerging zone. Transient expression analysis confirmed that SlPAO1 was able to produce H2O2 while SlRboh3 and SlRboh4 were capable of producing O-2(center dot-). Melatonin-ROS signaling cassette was also found in the regulation of LR formation in rice root and lateral hyphal branching in fungi. These results suggested that SlPAO1-H2O2 and SlRboh3/4-O-2(center dot-) acted as downstream of melatonin to regulate the expression of cell cycle genes, resulting in LRP initiation and LR development. Such findings uncover one of the regulatory pathways for melatonin-regulated LR formation, which extends our knowledge for melatonin-regulated plant intrinsic physiology.

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