ArticleBMC plant biology2025
Integrated transcriptomic and metabolomic analyses elucidate the mechanism by which grafting impacts potassium utilization efficiency in tobacco.
Article in BMC plant biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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3 citing papers in PubMed.
- Effects of the potassium-solubilizing bacteria Arthrobacter sp. Y43 and Bacillus sp. H42 on tobacco seedling growth and rhizosphere potassium availability under different inoculation strategies.Archives of microbiology · 2026Article
- Coordinated regulation of amino acid metabolism and transport in cereal nitrogen remobilization for grain filling.Frontiers in plant science · 2026Review
- Multiomic analysis of the synthetic pathways of secondary metabolites in tobacco leaves at different developmental stages.Frontiers in plant science · 2025Article
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5 authors.
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Abstract
backgroundPotassium plays a crucial role in determining the quality of flue-cured tobacco leaves. Our prior investigations have demonstrated that using potassium-efficient rootstocks through grafting offers a viable solution to the prevalent issue of low potassium levels in Chinese flue-cured tobacco leaves. Nevertheless, the specific molecular mechanisms responsible for the increase in potassium content following grafting in tobacco leaves have yet to be elucidated. This study revealing for the first time how grafting improves potassium utilization efficiency through combined transcriptome and metabolome analysis.
resultsThis study selected Wufeng NO. 2, a potassium-efficient variety, and Yunyan 87, a main cultivar, as the research subjects to investigate the underlying reasons for differential potassium utilization efficiency among different tobacco rootstocks through transcriptome and metabolic data analysis of grafted tobacco. The results showed a considerable increment of 90.1% in the potassium content of the grafted tobacco leaves. Overall, 2044 differentially expressed genes were identified through transcriptome analysis, with the majority being enriched in plant hormone signal transduction and the MAPK pathway. Metabolome analysis revealed 175 metabolites with significant differences, primarily involving primary metabolites such as amino acids and carbohydrates. Among these, there was an increase in the metabolites levels related to glycolysis, amino acid metabolism, and the TCA cycle pathway in grafted tobacco leaves. The key metabolites and genes in the above pathways were selected for Mantel-Pearson correlation analysis, leading to the identification of 2 genes and 3 metabolites, including IAA, CIP1, D-fructose, Fumaric acid and Oxoglutaric acid, that were significantly associated with the increased potassium content in grafted tobacco.
conclusionsThis study uncovers the intricate molecular mechanism behind grafting tobacco to enhance potassium utilization efficiency, thereby offering theoretical support for enhancing crop nutrient utilization efficiency through grafting technology.
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