Open AccessHexanoic acid is a resistance inducer that protects tomato plants against P seudomonas syringae by priming the jasmonic acid and salicylic acid pathways
Author(s) -
Scalschi Loredana,
Vicedo Begonya,
Camañes Gemma,
FernandezCrespo Emma,
Lapeña Leonor,
GonzálezBosch Carmen,
GarcíaAgustín Pilar
Publication year - 2013
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.12010
Subject(s) - pseudomonas syringae , jasmonic acid , salicylic acid , coronatine , hexanoic acid , biology , systemic acquired resistance , effector , arabidopsis thaliana , microbiology and biotechnology , biochemistry , arabidopsis , pathogen , gene , mutant
Summary Hexanoic acid‐induced resistance ( H x‐ IR ) is effective against several pathogens in tomato plants. Our study of the mechanisms implicated in H x‐ IR against P seudomonas syringae pv. tomato DC 3000 suggests that hexanoic acid ( H x) treatment counteracts the negative effect of coronatine ( COR ) and jasmonyl‐isoleucine ( JA ‐ I le) on the salicylic acid ( SA ) pathway. In H x‐treated plants, an increase in the expression of jasmonic acid carboxyl methyltransferase ( JMT ) and the SA marker genes PR 1 and PR 5 indicates a boost in this signalling pathway at the expense of a decrease in JA ‐ I le. Moreover, H x treatment potentiates 12‐oxo‐phytodienoic acid accumulation, which suggests that this molecule might play a role per se in H x‐ IR . These results support a positive relationship between the SA and JA pathways in H x‐primed plants. Furthermore, one of the mechanisms of virulence mediated by COR is stomatal re‐opening on infection with P . syringae . In this work, we observed that H x seems to inhibit stomatal opening in planta in the presence of COR , which suggests that, on infection in tomato, this treatment suppresses effector action to prevent bacterial entry into the mesophyll.