ACTA AGRICULTURAE BOREALI-SINICA ›› 2019, Vol. 34 ›› Issue (3): 194-202. doi: 10.7668/hbnxb.201751450

Special Issue: Sweet pepper

• Resource and Environment·Plant Protection • Previous Articles     Next Articles

Comparative Transcriptome Analysis of Phytophthora blight Resistance of Pepper at Seedling Stage

LEI Yang1, CHENG Yan1, QIAO Ning1, JIAO Yansheng1, MIAO Ruyi1, YANG Yuhua2   

  1. 1. Institute of Vegetable, Shanxi Academy of Agricultural Sciences, Taiyuan 030031, China;
    2. Institute of Crop Germplasm Resources, Shanxi Academy of Agricultural Sciences, Taiyuan 030031, China
  • Received:2019-02-10 Published:2019-06-28

Abstract: The objective of this study was to study the molecular mechanism of pepper phytophthora blight and to explore the functional genes related to phytophthora blight resistance. Based on the identification of phytophthora blight resistance in 114 natural populations of pepper, one resistant material and three susceptible materials were selected as materials to perform high-throughput transcriptome sequencing by means of Illumina RNA-seq sequencing platform. The clean reads were selected to map the reference sequences of Pepper_Zunla_1_Ref_v1.0. The results showed that 78.95%-85.11% clean reads could be matched to unique genome locus. The gene expression level was calculated using RPKM method. The false discovery rate ≤ 0.001 and the absolute value of|log2 Ratio| ≥ 1 were used as the threshold to judge the significance of gene expression differences. Finally, the functions and pathways of differentially expressed genes(DEGs) were annotated by comparing them with the Gene Ontology(GO) and Kyoto Encyclopedia of Genes and Genomes(KEGG). According to the top 10 GO classification, the main functions included the oxidoreductase activity, carboxylolyase activity, peroxidase activity, metabolic process and adverse reaction etc. Among them, 117 DEGs could be classified into the KEGG pathway, including 25 up-regulated DEGs and 92 down-regulated DEG. These pathways were associated with the ubiquitin-mediated proteolysis, oxidative phosphorylation, plant hormone signaling, phospholipase D signaling, and phosphatidylinoinositol signaling systems. The disease resistance of pepper was mainly related to enzymatic activity, stress response, protein metabolism pathway, plant hormones and other regulations. It was found that the disease resistance of pepper was a highly complex process, which was composed of multiple cross channel regulation, including metabolic processes, defense responses and hormone regulation, etc. The results laid the foundation for further studying the molecular mechanism of pepper disease resistance.

Key words: Pepper, Phytophthora blight, Transcriptome, Differentially expressed genes, Function

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Cite this article

LEI Yang, CHENG Yan, QIAO Ning, JIAO Yansheng, MIAO Ruyi, YANG Yuhua. Comparative Transcriptome Analysis of Phytophthora blight Resistance of Pepper at Seedling Stage[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2019, 34(3): 194-202. doi: 10.7668/hbnxb.201751450.

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