The effect of heat shock on the induction of disease resistance in tomato plant.

Abstract

For the purpose of estimating heat shock as a protection activator, the aerial portions of the seedlings at the three-leaf stage of tomato cv. 'Natsunokoma', were dipped in water at various temperatures. Inoculation test of Botrytis cinerea were performed onto the cut of first and second true leaves 24h after the treatment. Although the infiltrated area spread beyond the region of inoculation part in the control leaves, the less disease symptoms were observed in the leaves dipped into hotter water. To clarify the resistance mechanisms, the requirement of SA and the expression of PR genes were examined.