Further effects of vomifoliol on stomatal aperture and on the germination of lettuce and the growth of cucumber seedlings.

(+)-Vomifoliol was shown to be as rapidly acting as (±) abscissic acid in stomatal closure time studies which involved the use of Eichhornia crassipes (Mart) Solms epidermal strips. (±)-Vomifoliol was shown to be less effective, while 4-(1-hydroxy-4-keto-2,6,6-trimethyl-2-cyclohexen-1-yl)-3-buten-2-one) had only a slight effect in the same bioassay system. (+)-Vomifoliol showed no significant effect on the germination of lettuce seeds or the growth of cucumber seedlings.