期刊
HORTICULTURE RESEARCH
卷 8, 期 1, 页码 -出版社
OXFORD UNIV PRESS INC
DOI: 10.1038/s41438-021-00588-x
关键词
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资金
- National Key Research and Development Program [2018YFD1000602]
- Chongqing Research Program of Basic Research and Frontier Technology [cstc2018jcyjAX0407]
- Natural Science Foundation of China [31572323]
The study shows that dynamic changes in DNA methylation levels are related to stress resistance in woody plants, and inhibiting methylation can enhance mulberry resistance to pathogens. Gene silencing of MnMET1 can increase the plant's disease resistance, while MITEs play a crucial role in controlling DNA methylation levels and gene expression.
DNA methylation has been proposed to regulate plant stress resistance. However, the dynamic changes in DNA methylation in woody plants and their correlations with pathogenic responses are not fully understood. Here, we present single-base maps of the DNA methylomes of mulberry (Morus notabilis) leaves that were subjected to a mock treatment or inoculation with Botrytis cinerea. Compared with the former, the latter showed decreased mCG and mCHG levels and increased mCHH levels. DNA methylation inhibitors reduced resistance gene methylation levels and enhanced mulberry resistance, suggesting that the hypomethylation of resistance genes affects mulberry resistance to B. cinerea. Virus-induced gene silencing of MnMET1 enhanced the expression of mulberry-resistance genes, thereby increasing the plant's resistance to B. cinerea. We also found that MITEs play a dominant role in controlling DNA methylation levels. MITEs appear to be the main sources of 24-nt siRNAs that regulate gene expression through the RNA-directed DNA methylation pathway.
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