Artículos de revistas
Brassinosteroids interact negatively with jasmonates in the formation of anti-herbivory traits in tomato
Date
2009Registration in:
JOURNAL OF EXPERIMENTAL BOTANY, v.60, n.15, p.4346-4360, 2009
0022-0957
10.1093/jxb/erp270
Author
CAMPOS, Marcelo Lattarulo
ALMEIDA, Marcilio de
ROSSI, Monica Lanzoni
MARTINELLI, Adriana Pinheiro
LITHOLDO JUNIOR, Celso Gaspar
FIGUEIRA, Antonio
RAMPELOTTI-FERREIRA, Fatima Teresinha
VENDRAMIM, Jose Djair
BENEDITO, Vagner Augusto
PERES, Lazaro Eustaquio Pereira
Institutions
Abstract
Given the susceptibility of tomato plants to pests, the aim of the present study was to understand how hormones are involved in the formation of tomato natural defences against insect herbivory. Tomato hormone mutants, previously introgressed into the same genetic background of reference, were screened for alterations in trichome densities and allelochemical content. Ethylene, gibberellin, and auxin mutants indirectly showed alteration in trichome density, through effects on epidermal cell area. However, brassinosteroids (BRs) and jasmonates (JAs) directly affected trichome density and allelochemical content, and in an opposite fashion. The BR-deficient mutant dpy showed enhanced pubescence, zingiberene biosynthesis, and proteinase inhibitor expression; the opposite was observed for the JA-insensitive jai1-1 mutant. The dpyxjai1-1 double mutant showed that jai1-1 is epistatic to dpy, indicating that BR acts upstream of the JA signalling pathway. Herbivory tests with the poliphagous insect Spodoptera frugiperda and the tomato pest Tuta absoluta clearly confirmed the importance of the JA-BR interaction in defence against herbivory. The study underscores the importance of hormonal interactions on relevant agricultural traits and raises a novel biological mechanism in tomato that may differ from the BR and JA interaction already suggested for Arabidopsis.