Abstract
The effects of the application of the jasmonic acid (JA) derivative n-propyl dihydrojasmonate (PDJ) on lesion diameter, endogenous abscisic acid (ABA), phaseic acid (PA), JA, aroma volatiles, and antioxidant activity were investigated in grapes infected by the pathogen Glomerella cingulata. The berries were immersed in 0.4mM PDJ solution before inoculation with the pathogen and stored at 25°C for 12 days. Lesion diameters from the pathogen decreased upon PDJ application. Endogenous ABA and JA concentrations increased in inoculated ‘Kyoho’ grape berries (Vitis labrusca×Vitisvinifera). PDJ application before inoculation increased ABA and PA concentrations, perhaps through the activation of Vitis vinifera and VvCYP707A1 genes. The results suggest that the synergistic effect of JA and ABA may play a role in the defense mechanism against pathogen infection in grape berries. In addition, PDJ application generally increased the production of aldehydes, esters, and terpenes. These volatiles may also be associated with resistance to pathogen infection.
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