木质素
表观遗传学
DNA甲基化
生物合成
甲基化
非生物成分
转录组
生物化学
基因
生物
次生代谢物
化学
植物
基因表达
生态学
作者
Bowei Chen,Yile Guo,Xu Zhang,Xiaogang Wang,Lesheng Cao,Tianxu Zhang,Zihui Zhang,Wei Zhou,Linan Xie,Jiang Wang,Shanwen Sun,Chuanping Yang,Qingzhu Zhang
标识
DOI:10.3389/fpls.2022.1090967
摘要
Lignin is one of the most important secondary metabolites and essential to the formation of cell walls. Changes in lignin biosynthesis have been reported to be associated with environmental variations and can influence plant fitness and their adaptation to abiotic stresses. However, the molecular mechanisms underlying this association remain unclear. In this study, we evaluated the relations between the lignin biosynthesis and environmental factors and explored the role of epigenetic modification (DNA methylation) in contributing to these relations if any in natural birch. Significantly negative correlations were observed between the lignin content and temperature ranges. Analyzing the transcriptomes of birches in two habitats with different temperature ranges showed that the expressions of genes and transcription factors (TFs) involving lignin biosynthesis were significantly reduced at higher temperature ranges. Whole-genome bisulfite sequencing revealed that promoter DNA methylation of two NAC-domain TFs, BpNST1/2 and BpSND1 , may be involved in the inhibition of these gene expressions, and thereby reduced the content of lignin. Based on these results we proposed a DNA methylation-mediated lignin biosynthesis model which responds to environmental factors. Overall, this study suggests the possibility of environmental signals to induce epigenetic variations that result in changes in lignin content, which can aid to develop resilient plants to combat ongoing climate changes or to manipulate secondary metabolite biosynthesis for agricultural, medicinal, or industrial values.
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