Multiple recognition of RXLR effectors is associated with nonhost resistance of pepper against Phytophthora infestans. Issue 3 (2nd June 2014)

• Record Type: Journal Article
• Authors: Lee, Hyun‐Ah; Kim, Shin‐Young; Oh, Sang‐Keun; Yeom, Seon‐In; Kim, Saet‐Byul; Kim, Myung‐Shin; Kamoun, Sophien; Choi, Doil
• Is Part Of: New phytologist. Volume 203:Issue 3(2014)
• Page Start: 926
• Page End: 938
• Publication Date: 2014-06-02
• Subjects: Botany -- Periodicals; 580
• DOI: 10.1111/nph.12861
• Languages: English
• ISSNs: 0028-646X

Abstract

<abstract abstract-type="main" id="nph12861-abs-0001"> <title>Summary</title> <p> <list id="nph12861-list-0001" list-type="bullet"> <list-item> <p>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.</p> </list-item> <list-item> <p>We performed transient expression of 54 <italic>Phytophthora infestans</italic>RXLR effectors in pepper (<italic>Capsicum annuum</italic>) accessions. We used optimized heterologous expression methods and analyzed the inheritance of effector‐induced cell death in an F<sub>2</sub> population derived from a cross between two pepper accessions.</p> </list-item> <list-item> <p>Pepper showed a localized cell death response upon inoculation with <italic>P. infestans</italic>, 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<sub>2</sub> population derived from a cross between two pepper accessions fit 15 : 1, 9 : 7 or 3 : 1 ratios, depending on the effector.</p> </list-item> <list-item> <p>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 <italic>P. infestans</italic> and confer resistance durability.</p> </list-item> </list> </p> </abstract>