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Physiological antitranspirants can reduce financial risks to growers by temporarily preventing drought stress, improving product quality, and extending the shelf life of ornamental bedding plants. Exogenous abscisic acid (ABA) is an effective antitranspirant that induces stomatal closure in a rate-dependent manner, reducing transpirational water loss in many species. However, it may also cause chlorosis, which reduces product quality. Synthetic ABA analogs have similar effects on stomatal conductance ( g  S ) but are not known to induce chlorosis. We studied the effects of ABA and its analog 8′ acetylene ABA methyl-ester (PBI 429) on  g  S  and net photosynthesis (P n ) in pansies ( Viola  × wittrockiana ), compared the efficacy and longevity of each compound, and quantified the resulting chlorosis. Plants were treated with spray solutions of ABA (0 to 2000 mg·L −1 ) and PBI 429 (0 to 200 mg·L −1 ) and irrigated daily. Gas exchange and leaf chlorophyll measurements were made twice weekly for 2 weeks. Additional measurements were taken once or twice weekly through 47 days. Abscisic acid reduced leaf chlorophyll content and P n  in a rate-dependent manner for 14 days after application but reduced  g  S  for only 11 days, whereas PBI 429 reduced P n  and  g  S  similarly for 7 days and did not reduce leaf chlorophyll content. Reductions in  g  S  and P n  were greatest on the first day after treatment for both compounds. Our results demonstrate that ABA is more effective than PBI 429 at 100 and 200 mg·L −1 , but also causes chlorosis, whereas PBI 429 is an effective antitranspirant without this phytotoxic effect.

Antitranspirational Efficacy and Longevity of Abscisic Acid and a Synthetic Abscisic Acid Analog in Pansies (Viola ×wittrockiana)