数字农科院2.0

Transcriptomic and metabolomic analyses reveal molecular mechanisms of tobacco mosaic virus (TMV) resistance in Nicotiana tabacum L.

文献类型： 外文期刊

作者： Caiyue Li;Qiang Zhang;Xuebo Wang;Zhengwen Liu;Xinyao Zhang;Caihong Jiang;Lirui Cheng;Aiguo Yang;Yangyang Li;Yan Ji;Dan Liu

作者机构：

关键词： Flavonoid biosynthesis;Naringin;Salicylic acid;Tobacco;Tobacco mosaic virus

期刊名称： BMC Plant Biology

ISSN： 1471-2229

年卷期： 2025 年 25 卷 1 期

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收录情况： SCIE（2025版）

摘要： Tobacco mosaic virus (TMV) severely impairs plant growth, leading to significant economic losses in the production of various Solanaceae crops, including tobacco (Nicotiana tabacum), tomato (Solanum lycopersicum) and pepper (Caspicum annuum). To investigate TMV resistance mechanisms, we analyzed the transcriptomic and metabolomic profiles of susceptible (K326) and resistant (R_K326) tobacco lines. Transcriptomic analysis revealed that the number of differentially expressed genes (DEGs) in R_K326 was about 2 times higher than in K326 at 9 days post-inoculation (dpi), suggesting a greater involvement of defense-related genes in the resistant line. KEGG pathway analysis of DEGs highlighted the significant enrichment of biotic-stress related pathways that were specifically activated in R_K326 line following TMV infection. Notably, the flavonoid biosynthesis pathway was enriched in both transcriptomic and metabolomic analyses of R_K326. At 9 dpi, four flavonoid compounds accumulated at significantly higher levels in R_K326 compared to K326. Among them, naringin was demonstrated as a key player in TMV resistance by exogenous treatment and western blot analysis of TMV coat proteins. Two genes encoding the rate-limiting enzymes of naringin biosynthesis, asm_5.4770 and asm_7.408, were screened as candidate genes according to their high expression levels in R_K326. Additionally, Salicylic acid (SA) biosynthesis-related genes were up-regulated in R_K326, accompanied by the significant accumulation of SA levels. These results suggest that both the naringin and SA positively regulate tobacco resistance to TMV, providing insights into the response mechanisms of tobacco to TMV infection and new targets for TMV resistance breeding in Solanaceae crops.

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