Co-Authors:
Harel, Y.M., Department of Plant Pathology and Weed Research, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
David, D.R., Department of Plant Pathology and Weed Research, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Elad, Y., Department of Plant Pathology and Weed Research, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Abstract:
The ability of root zone-applied Trichoderma harzianum T39 and acibenzolar-S-methyl (BTH) to induce systemic resistance in strawberry (Fragaria x ananassa) plants was tested. The target foliar pathogen was the biotrophic pathogen Podosphaera aphanis. The two agents were applied to the soil at two different concentrations 2-3 days before inoculation, with or without an additional application on the day of pathogen inoculation. Both agents induced significant resistance to the disease on leaves. Real-time quantitative PCR was used to examine the effects of T. harzianum T39 and BTH on expression of defense-related genes in strawberry leaves. One day after the drenching of strawberry roots, each of the inducers had affected the expression of PR-encoding genes; FaPRl expression was induced by 2- and 5-fold, Faolp2 expression by 55- and 8-fold and Fra a3 expression by 4- and 22-fold following treatment with BTH or T. harzianum T39, respectively. The level of Falox expression was not affected by BTH treatment, but did increase ∼5-fold following treatment with T. harzianum T39. Inoculation of foliage with P. aphanis increased the expression level of FaPR 1 and Fra a3 (∼3-fold increase), as well as Faolp2 (∼91-fold) and FaLox (∼2-fold) 1 day after inoculation. Drenching with T. harzianum T39 or BTH increased Faolp2 expression one day post infection, but no priming effect could be observed.
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מונוכרום
הדגשת קישורים
חסימת אנימציה
פונט קריא
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