文献类型： 外文期刊

作者： Lei, Gang ¹ ; Zhou, Kun-Hua ¹ ; Chen, Xue-Jun ¹ ; Huang, Yue-Qin ¹ ; Yuan, Xin-Jie ¹ ; Li, Ge-Ge ¹ ; Xie, Yuan-Yuan ¹ ; Fang, Rong ¹ ;

作者机构： 1.Jiangxi Acad Agr Sci, Inst Vegetables & Flowers, Nanchang 330200, Peoples R China

关键词： Capsicum annuum; Phytophthora capsici; Transcriptome; Metabolome; Salicylic acid; Ca2+; Flavonoid biosynthesis pathways

期刊名称：BMC GENOMICS （ 影响因子：4.4； 五年影响因子：4.7 ）

ISSN： 1471-2164

年卷期： 2023 年 24 卷 1 期

页码：

收录情况： SCI

摘要： BackgroundPhytophthora root rot caused by the oomycete Phytophthora capsici is the most devastating disease in pepper production worldwide, and current management strategies have not been effective in preventing this disease. Therefore, the use of resistant varieties was regarded as an important part of disease management of P. capsici. However, our knowledge of the molecular mechanisms underlying the defense response of pepper roots to P. capsici infection is limited.MethodsA comprehensive transcriptome and metabolome approaches were used to dissect the molecular response of pepper to P. capsici infection in the resistant genotype A204 and the susceptible genotype A198 at 0, 24 and 48 hours post-inoculation (hpi).ResultsMore genes and metabolites were induced at 24 hpi in A204 than A198, suggesting the prompt activation of defense responses in the resistant genotype, which can attribute two proteases, subtilisin-like protease and xylem cysteine proteinase 1, involved in pathogen recognition and signal transduction in A204. Further analysis indicated that the resistant genotype responded to P. capsici with fine regulation by the Ca2+- and salicylic acid-mediated signaling pathways, and then activation of downstream defense responses, including cell wall reinforcement and defense-related genes expression and metabolites accumulation. Among them, differentially expressed genes and differentially accumulated metabolites involved in the flavonoid biosynthesis pathways were uniquely activated in the resistant genotype A204 at 24 hpi, indicating a significant role of the flavonoid biosynthesis pathways in pepper resistance to P. capsici.ConclusionThe candidate transcripts may provide genetic resources that may be useful in the improvement of Phytophthora root rot-resistant characters of pepper. In addition, the model proposed in this study provides new insight into the defense response against P. capsici in pepper, and enhance our current understanding of the interaction of pepper-P. capsici.