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The dynamic transcriptome of pepper (Capsicum annuum) whole roots reveals an important role for the phenylpropanoid biosynthesis pathway in root resistance to Phytophthora capsici

文献类型： 外文期刊

作者： Li, Ying 1 ; Yu, Ting 2 ; Wu, Tingquan 1 ; Wang, Rui 1 ; Wang, Hengming 1 ; Du, Hu 1 ; Xu, Xiaowan 1 ; Xie, Dasen 1 ; Xu, Xi 1 ;

作者机构： 1.Guangdong Acad Agr Sci, Vegetables Res Inst, Guangzhou 510640, Peoples R China

2.Guangdong Acad Agr Sci, Agrobiol Gene Res Ctr, Guangzhou 510640, Peoples R China

3.Guangdong Key Lab New Technol Res Vegetables, Guangzhou 510640, Peoples R China

关键词： Capsicum annuum; Phytophthora root rot; Root-mediated resistance; RNA-Seq; Secondary metabolites

期刊名称：GENE （ 影响因子：3.688； 五年影响因子：3.329 ）

ISSN： 0378-1119

年卷期： 2020 年 728 卷

页码：

收录情况： SCI

摘要： Phytophthora root rot, caused by the soilborne oomycete pathogen Phytophthora capsici (Leon.), is a devastating disease causing significant losses in pepper production worldwide. To uncover the mechanism of root-mediated resistance to P. capsici we elucidated the dynamic transcriptome of whole pepper roots of the resistant accession CM334 and the susceptible accession NMCA10399 after P. capsici infection at 0, 12 and 36 hpi using RNA-Seq method. We detected that the roots of the resistant CM334 and the susceptible NMCA10399 had different transcriptional responses to P. capsici, suggesting the former activated a response to P. capsici earlier than the latter. KEGG enrichment analysis showed the pathways involved in the synthesis of secondary metabolites were those in which the most DEGs were enriched. Focusing on the gene regulation of phenylpropanoid biosynthesis-related genes, we found genes related to the key enzyme phenylalanine ammonia-lyase (PAL) were activated earlier with greater changes in the resistant accession than in the susceptible one. Moreover, genes related to cinnamoyl-CoA reductase (CCR1) were also upregulated in resistant roots but downregulated with great folder changes in susceptible roots. Briefly, we inferred that the phenylpropanoid biosynthesis pathway, especially cinnamaldehyde and lignin derived from its branches, played significant roles in pepper root resistance to P. capsici. These results provide new insight into root-mediated resistance to P. capsici in pepper.

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