Abstract
Summary The effects of a turgorin, PLMF 1, on stomatal movement and leaf transpiration in Commelinacommunis were investigated. Concentrations of 10-3 mol m-3 or greater inhibited stomatal opening in epidermal strips. A concentration of 10-2 mol m-3 inhibited further stomatal opening in strips with already opened stomata and 10-1 mol m-3 induced significant stomatal closure. No effect was found upon leaf transpiration. These findings are contrasted with the effects of abscisic acid on stomatal movement.
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