title: Coronatine and salicylic acid: the battle between Arabidopsis and Pseudomonas for phytohormone control.
abstract: 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.
authors.affiliation: Plant Molecular and Cellular Biology Program, Horticultural Sciences Department, PO Box 110690, University of Florida, Gainesville, FL 32611-0690, USA.
authors.forename: Anna
authors.initials: A
authors.lastname: Block
authors.forename: Eric
authors.initials: E
authors.lastname: Schmelz
authors.forename: Jeffrey B
authors.initials: JB
authors.lastname: Jones
authors.forename: Harry J
authors.initials: HJ
authors.lastname: Klee