Open AccessThe A rabidopsis immune regulator SRFR 1 dampens defences against herbivory by S podoptera exigua and parasitism by H eterodera schachtii
Author(s) -
Nguyen Phuong Dung T.,
Pike Sharon,
Wang Jianying,
Nepal Poudel Arati,
Heinz Robert,
Schultz Jack C.,
Koo Abraham J.,
Mitchum Melissa G.,
Appel Heidi M.,
Gassmann Walter
Publication year - 2016
Publication title -
molecular plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.945
H-Index - 103
eISSN - 1364-3703
pISSN - 1464-6722
DOI - 10.1111/mpp.12304
Subject(s) - heterodera schachtii , biology , arabidopsis , pseudomonas syringae , jasmonic acid , plant defense against herbivory , nematode infection , effector , r gene , pathosystem , gene , genetics , plant disease resistance , microbiology and biotechnology , nematode , botany , mutant , ecology
Summary Plants have developed diverse mechanisms to fine tune defence responses to different types of enemy. Cross‐regulation between signalling pathways may allow the prioritization of one response over another. Previously, we identified SUPPRESSOR OF rps4‐RLD 1 ( SRFR 1 ) as a negative regulator of ENHANCED DISEASE SUSCEPTIBILITY1 ( EDS1 )‐dependent effector‐triggered immunity against the bacterial pathogen P seudomonas syringae pv. tomato strain DC 3000 expressing avr R ps4 . The use of multiple stresses is a powerful tool to further define gene function. Here, we examined whether SRFR 1 also impacts resistance to a herbivorous insect in leaves and to a cyst nematode in roots. Interestingly, srfr1‐1 plants showed increased resistance to herbivory by the beet army worm S podoptera exigua and to parasitism by the cyst nematode H eterodera schachtii compared with the corresponding wild‐type Arabidopsis accession RLD . Using quantitative real‐time PCR ( qRT‐PCR ) to measure the transcript levels of salicylic acid ( SA ) and jasmonate/ethylene ( JA / ET ) pathway genes, we found that enhanced resistance of srfr1‐1 plants to S . exigua correlated with specific upregulation of the MYC 2 branch of the JA pathway concurrent with suppression of the SA pathway. In contrast, the greater susceptibility of RLD was accompanied by simultaneously increased transcript levels of SA , JA and JA / ET signalling pathway genes. Surprisingly, mutation of either SRFR 1 or EDS 1 increased resistance to H . schachtii , indicating that the concurrent presence of both wild‐type genes promotes susceptibility. This finding suggests a novel form of resistance in Arabidopsis to the biotrophic pathogen H . schachtii or a root‐specific regulation of the SA pathway by EDS 1, and places SRFR 1 at an intersection between multiple defence pathways.