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First published online October 9, 2003; 10.1104/pp.103.027086

Plant Physiology 133:1367-1375 (2003)
© 2003 American Society of Plant Biologists

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PLANTS INTERACTING WITH OTHER ORGANISMS

Interactive Effects of Jasmonic Acid, Salicylic Acid, and Gibberellin on Induction of Trichomes in Arabidopsis1

M. Brian Traw and Joy Bergelson*

Department of Ecology and Evolution, University of Chicago, 1101 E. 57th Street, Chicago, Illinois 60637

Leaf trichomes protect plants from attack by insect herbivores and are often induced following damage. Hormonal regulation of this plant induction response has not been previously studied. In a series of experiments, we addressed the effects of artificial damage, jasmonic acid, salicylic acid, and gibberellin on induction of trichomes in Arabidopsis. Artificial damage and jasmonic acid caused significant increases in trichome production of leaves. The jar1-1 mutant exhibited normal trichome induction following treatment with jasmonic acid, suggesting that adenylation of jasmonic acid is not necessary. Salicylic acid had a negative effect on trichome production and consistently reduced the effect of jasmonic acid, suggesting negative cross-talk between the jasmonate and salicylate-dependent defense pathways. Interestingly, the effect of salicylic acid persisted in the nim1-1 mutant, suggesting that the Npr1/Nim1 gene is not downstream of salicylic acid in the negative regulation of trichome production. Last, we found that gibberellin and jasmonic acid had a synergistic effect on the induction of trichomes, suggesting important interactions between these two compounds.

Article, publication date, and citation information can be found at www.plantphysiol.org/cgi/doi/10.1104/pp.103.027086.

1 This work was supported by the National Science Foundation (Doctoral Dissertation Improvement grant no. IBN 0073095 to M.B.T.) and by the National Institutes of Health (grant no. GM 62504 to J.B.). M.B.T. was supported in part by a V. Dropkin Foundation postdoctoral fellowship.

* Corresponding author; e-mail jbergels{at}midway.uchicago.edu; fax 773–702–9740.

Received May 20, 2003; returned for revision June 10, 2003; accepted August 14, 2003.


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