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ABSTRACT: Bacillus amyloliquefaciens WS-10 induces systemic resistance in flue-cured tobacco plants against bacterial wilt disease

PROVIDER: PRJNA1018200 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR26081445_1.fastq.gz	Fastqsanger.gz
	SRR26081445_2.fastq.gz	Fastqsanger.gz
	SRR26081446_1.fastq.gz	Fastqsanger.gz
	SRR26081446_2.fastq.gz	Fastqsanger.gz
	SRR26081447_1.fastq.gz	Fastqsanger.gz

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Project description:Background :Nitrogen (N) supply directly impacts growth and quality in flue-cured tobacco. To decipher molecular responses to N gradients, we integrated transcriptomics and weighted gene co-expression network analysis (WGCNA) on leaves from four N treatments: 0 (inherent soil fertility), 60 (low), 105 (standard), and 150 kg/hm² (high). Results :Phenotypic analysis revealed dose-dependent increases in leaf nitrogen content with higher N application, accompanied by excessive vegetative growth and delayed maturity at 150 kg/hm². Transcriptome sequencing identified 47,216 genes, with differentially expressed genes (DEGs) increasing linearly with N levels (1,458–2,147 DEGs). Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment highlighted nitrogen metabolism pathways, yielding 14 DEGs (11 in assimilation, 3 in transport). Weighted gene co-expression network analysis (WGCNA) uncovered two modules (lightcyan1 and black) strongly associated with N responses, harboring transcription factors NtERF11 (AP2/ERF), NtWRKY3 (WRKY), and NtSRM1 (MYB). Sub-network analysis within these modules identified five hub genes: NtGLN1-1, two uncharacterized genes, NtDFC , and NtGDSL. NtGDSL may enhance nitrogen use efficiency (NUE) through stress-responsive mechanisms, while NtDFC could integrate N signaling with developmental processes. These findings provide novel insights into N regulatory networks in flue-cured tobacco. Conclusions :This study reveals the effects of nitrogen application rates on flue-cured tobacco growth and gene expression. By identifying key transcription factors and genes regulating nitrogen metabolism, it provides a theoretical basis for dissecting nitrogen regulatory mechanisms, optimizing fertilization strategies, and improving nitrogen use efficiency in tobacco production.

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Project description:Tobacco, as an important cash crop and model plant, has been studied and explored in various aspects. In China, Yunyan 87 was recognized as a flue-cured tobacco variety and had been widely concerned due to its excellent product quality characteristics. The quality of tobacco products depends on the compound collection of tobacco leaves, including pigments, carbohydrates, amino acids, polyphenols and alkaloids. Present study investigated tobacco seedlings, with the assistant of the untargeted metabonomic technology and the label-free proteomic technology to analyze metabolites and proteins differences in leaf, stem, and root groups respectively. From 298 metabolites and 4993 proteins obtained, there were significant differences in both primary and secondary metabolism involved aroma precursors biosynthesis in seedling tobacco leaves, stems, and roots, such as carbohydrate metabolism, energy metabolism, and amino acid biosynthesis, and secondary metabolism phenylpropanoids, flavonoids and alkaloid biosynthesis in this study. Especially alkaloids metabolites identification results showed nornicotine, anatabine, anatalline, and myosmine, were significantly higher in tobacco roots than in leaves, and stems at seedling stage.

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