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Chilling stress is one of the most important environ-mental stresses for chilling-sensitive species. The pre-sent study conducted RNA-Seq and WGCNA analysis to clarify the correlation patterns among genes of dif-ferent treatments in tobacco (Nicotiana tabacum). A total of 10,355 DEGs were found in chilling treatment relative to control treatment. Additionally, functional annotations revealed that 48 genes were found to be specifically expressed in lignin biosynthesis pathway in tobacco seedlings under chilling stress. Our results revealed that the biosynthesis of caffeoyl-CoA was regulated by HCT and C3H. Furthermore, the G-type lignin biosynthesis branch was enhanced under low temperature, which contributed to an increase in lig-nin content and changes in lignin composition, indi-cating that G-type lignin may play an important role in tobacco’s resistance to chilling stress.


Chilling Stress, Lignin Biosynthesis, Nicotiana Tabacum, Transcriptomic, WGCNA.
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