ISHS Acta Horticulturae 381: International Symposium on Natural Phenols in Plant Resistance
SALICYLIC ACID: A SIGNAL SUBSTANCE PRODUCED UPON ELICITING POTATO LEAVES WITH ARACHIDONIC ACID? |
| Authors: | J.-L. Coquoz, A.J. Buchala, P. Meuwly |
| Abstract:
Systemic acquired resistance (SAR) against Phytophthora infestans in potato was obtained after injection of an arachidonic acid suspension in the intercellular space. A good protection occured in the upper leaf when low concentrations were applied (10ppm). Salicylic acid (SA) was quantified in the treated leaf and in the upper, protected leaf to test its putative role as a signalling molecule. Even if an increase was detected 6 hours after the application in the treated leaf, no significant changes in the SA level were found in the upper leaf. A slight local increase in the SA level was detected 7 days after infection with P. infestans but no systemic changes in SA levels were found. These results suggest that SA could possibly play a role in local resistance, but its role as a signalling molecule for SAR in potato seems questionable. | |
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