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Abstract Detail


Plant-Pest Interactions

Engelberth, Juergen [1].

Physiological concentrations of salicylic acid prime corn (Zea mays) seedlings against insect herbivory.

Salicylic acid (SA) is generally thought to suppress jasmonic acid (JA) related signaling events. However, we found an up-regulation of both, SA and JA in corn (Zea mays) seedlings treated with alamethicin over a period of at least 8h. JA was up-regulated not only locally at the application site but also in distal parts of the leaf as it was found for the elicitation by insect-derived elicitors (IE). By comparing alamethicin- and IE-induced JA accumulation and volatile (VOC) release we found that alamethicin induced less JA compared to IE treatment, but caused corn seedling to release more VOC. Additionally, alamethicin also up-regulated ethylene over the same period while IE did not. The synergistic effects of ethylene on JA-related defenses have already been described. Therefore, we focused our research on the effects of SA on JA induction and VOC release induced by treatment with IE. We found that physiological concentrations of SA (30 µM) applied through the root system enhances IE induced responses. JA and VOC were significantly increased in those plants primed with SA when compared to controls treated only with IE. In contrast, when corn seedlings treated with SA overnight were mechanically damaged we found a significant decrease in JA production. This differential effect of SA on JA induced by either IE application or mechanical damage sheds new light on the interaction of these important signaling compounds. The outcome of the cross talk between the two pathways seems to depend on the mode of induction. In conclusion, we believe that separate stimulus-specific pathways exist for the induction and/or production of JA in corn.


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1 - University of Texas at San Antonio, Biology, One UTSA Circle, San Antonio, TX, 78249, United States

Keywords:
Priming
salicylic acid
jasmonic acid
volatiles.

Presentation Type: Plant Biology Abstract
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P14007
Abstract ID:365


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