期刊
NEW PHYTOLOGIST
卷 203, 期 3, 页码 926-938出版社
WILEY
DOI: 10.1111/nph.12861
关键词
multiple interactions; nonhost resistance; pepper; Phytophthora infestans; RXLR effectors
资金
- National Research Foundation of the Korea Ministry of Education, Science and Technology [2010-0015105]
- Agricultural Genome Center Program [710001-03]
- Rural Development Administration of the Korean government
- National Junior Research Fellowship [NRF-2011-0001763]
- National Research Foundation of Korea [2010-0015105] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Nonhost resistance (NHR) is a plant immune response to resist most pathogens. The molecular basis of NHR is poorly understood, but recognition of pathogen effectors by immune receptors, a response known as effector-triggered immunity, has been proposed as a component of NHR. We performed transient expression of 54 Phytophthora infestans RXLR effectors in pepper (Capsicum annuum) accessions. We used optimized heterologous expression methods and analyzed the inheritance of effector-induced cell death in an F-2 population derived from a cross between two pepper accessions. Pepper showed a localized cell death response upon inoculation with P. infestans, suggesting that recognition of effectors may contribute to NHR in this system. Pepper accessions recognized as many as 36 effectors. Among the effectors, PexRD8 and Avrblb2 induced cell death in a broad range of pepper accessions. Segregation of effector-induced cell death in an F-2 population derived from a cross between two pepper accessions fit 15 : 1, 9 : 7 or 3 : 1 ratios, depending on the effector. Our genetic data suggest that a single or two independent/complementary dominant genes are involved in the recognition of RXLR effectors. Multiple loci recognizing a series of effectors may underpin NHR of pepper to P. infestans and confer resistance durability.
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