Effects of salicylate on stomatal resistance in detached tobacco leaves

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Abstract
Salicylate administered to detached tobacco (Nicotiana tabacum L.) leaves kept in the light rapidly induced an increase in stomatal resistance. This effect was not the result of water stress. Both the concentration of salicylate and the duration of the application to leaves affected the extent of the stomatal response. Application of salicylate for short periods showed that, once the stomatal response started, it was maintained for long period of time in the absence of further supply. K+ or Ca2+ were able to lower the stomatal resistance induced by salicylate, but only when both the ions were administered together with salicylate the stomatal closure was prevented. The results suggest that salicylate elicits some alterations interfering with the control of, stomatal movements, possibly affecting the integrity of cell membranes.

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