ArticleFrontiers in plant science2026
Ethylene represses jasmonate signaling to attenuate nicotine biosynthesis in
Article in Frontiers in plant science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
It has been known for many years that ethylene represses Jasmonic acid (JA)-induced nicotine biosynthesis. However, it is unclear whether ethylene (ET) alone can inhibit nicotine biosynthesis, and if so, how it achieves this. In this study, we found that ethylene alone can suppress nicotine accumulation and the expression of nicotine biosynthesis and transport genes in tobacco. We then performed transcriptome analysis to explore the underlying molecular mechanism. Results showed that over 6000 differentially expressed genes (DEGs) after 2, 4, 8 and 24 h treatment of ethephon, an ethylene-releasing compound, were identified. GO and KEGG enrichment analysis revealed that DEGs were enriched in pathways related to nicotine biosynthesis, including "pyridine nucleotide metabolic process" and "pyridine-containing compound metabolic process" 4 h after ethephon treatment. Further analysis revealed that expression of key regulators of JA-mediated nicotine biosynthesis was significantly altered by ethephon treatment. Specifically, CORONATINE-INSENSITIVE 1 (COI1) genes
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