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A new agricultural product containing the physiologically active cis form of abscisic acid (C-ABA) is scheduled to become available for ornamental production in 2012. This plant growth regulator generally prolongs irrigation intervals of ornamental plants. During pre-registration testing, the product greatly reduced whole plant transpiration on a variety of species, extending the time between irrigations whether applied as a drench or a foliar spray. However in some instances, drench application resulted in whole plant wilting of some annual species after one to three days. This occurred most often with certain cultivars of coleus, tomato and petunia. Investigations reported here associate wilting of petunia with low xylem water potential and near complete stomatal closure caused by prevention of water movement into root stele. Evidence is presented implicating that the exogenous C-ABA induced closure of root aquaporins led to shoot wilt.

Shoot Wilt of Petunia sp. Following Drenching with Exogenous ABA