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ISHS Acta Horticulturae 619: XXVI International Horticultural Congress: Potatoes, Healthy Food for Humanity: International Developments in Breeding, Production, Protection and Utilization

SYSTEMIC ACQUIRED RESISTANCE IN POTATO

Authors:   D.J. Navarre, P. Thomas, C. Brown, P. Kachroo
Keywords:   Salicylic acid, crop protection, pathogen, plant defense, disease resistance
Abstract:
Systemic acquired resistance (SAR) is a defense mechanism that is increasingly being exploited for crop protection. However, successful utilization of SAR will likely require optimization of defense induction for each crop followed by a determination of the pathogens against which SAR is effective. We are examining the capacity of different potato tissues to mount an SAR response. Both free and bound basal salicylic acid (SA) concentrations were measured in leaves, flowers, stems, roots and tubers. SA levels were the highest in leaves and flowers, with concentrations of up to 15 µg/gram fresh weight. Relative to Arabidopsis or tobacco, high SA levels were also found in stems, roots and tubers. SAR induction by different SAR elicitors, including harpin and BTH was examined. PR-1 was expressed constitutively, in the absence of elicitation. Little or no increase in PR-1 gene expression was seen after treatment with SAR inducers.
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