Open AccessCoronatine and salicylic acid: the battle between Arabidopsis and Pseudomonas for phytohormone control
Author(s) -
BLOCK ANNA,
SCHMELZ ERIC,
JONES JEFFREY B.,
KLEE HARRY J.
Publication year - 2005
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/j.1364-3703.2004.00265.x
Subject(s) - coronatine , arabidopsis , pseudomonas syringae , methyl jasmonate , salicylic acid , biology , jasmonate , phytotoxin , mutant , virulence , microbiology and biotechnology , virulence factor , arabidopsis thaliana , biochemistry , pathogen , gene , toxin
SUMMARY The phytotoxin coronatine is a jasmonate mimic produced by Pseudomonas syringae pv. tomato ( Pst ). Coronatine acts as a virulence factor in Arabidopsis and mutants insensitive to coronatine are resistant to Pst and have higher levels of salicylic acid (SA). In this work we used the SA‐deficient lines NahG and sid2‐2 to determine if coronatine acts directly as a virulence factor or indirectly by SA suppression. Using coronatine‐deficient Pst mutants we demonstrated that the lack of coronatine compromises Pst virulence in both wild‐type and SA‐deficient Arabidopsis. Thus, the action of coronatine is not due to SA suppression. Rather, SA‐independent jasmonate‐responses are the most likely mechanism for its action.