| Abstract Detail
Thursday Morning Contributed Talks Jayanty, Sastry, S [1], McCaig, Bonnie, C [2], Schilmiller, Tony [3], Howe, Gregg, A [2]. Role of jasmonic acid in systemic wound signaling in tomato. TOMATO plants systemically express proteinase inhibitors (PIs) in response to wounding and insect attack. This long-distance defense response is disrupted in tomato mutants that fail to synthesize or perceive either systemin or jasmonic acid (JA). Although this genetic evidence demonstrates an essential role for systemin and JA in the systemic response, the identity of the mobile wound signal remains to be established. Grafting experiments conducted with various wound response mutants have led us to propose that systemin acts at or near the wound site to amplify the production of JA, which in turn acts as a mobile signal. To test the hypothesis that JA is a phloem-mobile signal, we are performing biochemical analysis of tomato phloem exudates. We have also used immuno-cytochemical experiments to determine the subcellular and cell type-specific expression pattern of an acyl-CoA oxidase that is required for JA synthesis and production of the systemic wound signal. The results provide additional support for the hypothesis that JA is an essential component of the long-distance wound signal in tomato.
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1 - San Luis Valley Research Center,, Horticulture and Landscape Architecture, Colorado State University, 0249 East Rd. 9 North, Center, CO, 81125, USA
2 - MSU-DOE Plant Research Laboratory, Plant Biology, Michigan State University, East Lansing, Michigan, 48824, USA
3 - Michigan State University, Department of Biochemistry, East Lansing, Michigan, 48824, USA
Keywords:
Jasmonic acid
wound signaling
tomato
phloem exudates
acyl-CoA oxidase.
Session: SOL06-4
Location: Ballroom AB/Monona Terrace
Date: Thursday, July 27th, 2006
Time: 9:10 AM
Abstract ID:43 |
