Rice melatonin deficiency causes premature leaf senescence via DNA methylation regulation
2024
Yue Lu | Ahmed Gharib | Rujia Chen | Hanyao Wang | Tianyun Tao | Zhihao Zuo | Qing Bu | Yanze Su | Yaoqing Li | Yanmo Luo | Hamdi F. El-Mowafi | Zhichao Wang | Qianfeng Huang | Shuting Wang | Yang Xu | Pengcheng Li | Chenwu Xu | Zefeng Yang
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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