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Rice melatonin deficiency causes premature leaf senescence via DNA methylation regulation

作  者:
Yue Lu;Ahlam Gharib;Rujia Chen;Hanyao Wang;Tianyun Tao;Zhihao Zuo;Qing Bu;Yanze Su;Yaoqing Li;Yunzhi Luo;Hamdi F. El-Mowafi;Zhichao Wang;Qianfeng Huang;Zhen Wang;Yang Xu;Pengcheng Li;Chenwu Xu;Zefeng Yan
关键词:
Melatonin;Premature leaf senescence;Rice;DNA methylation;Epigenetic regulatio
摘  要:
In a study of DNA methylation changes in melatonin-deficient rice mutants, mutant plants showed premature leaf senescence during grain-filling and reduced grain yield. Melatonin deficiency led to transcriptional reprogramming, especially of genes involved in chlorophyll and carbon metabolism, redox regulation, and transcriptional regulation, during dark-induced leaf senescence. Hypomethylation of mCG and mCHG in the melatonin-deficient rice mutants was associated with the expression change of both protein-coding genes and transposable element-related genes. Changes in gene expression and DNA methylation in the melatonin-deficient mutants were compensated by exogenous application of melatonin. A decreased S-adenosyl-L-methionine level may have contributed to the DNA methylation variations in rice mutants of melatonin deficiency under dark conditions.

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