Inhibition of Stomatal Opening by Analogues of Abscisic Acid

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Abstract
Twenty analogues of abscisic acid have been tested for their activity as inhibitors of stomatal opening in isolated epidermis of Commelina communis. A number of derivatives showed slight activity but only two treatments resulted in significant stomatal closure and this was accompanied by destruction of the guard cell membranes. Such damage is characteristic of the stomatal response to farnesol, another sesquiterpenoid also thought to be involved in control of water loss. The implication of these results in the study of antitranspirants is considered.