224-26 Potencies of S-Abscisic Acid (S-ABA) and ABA Analog.

Poster Number 816

See more from this Division: C02 Crop Physiology and Metabolism
See more from this Session: General Crop Physiology & Metabolism: II
Tuesday, October 18, 2011
Henry Gonzalez Convention Center, Hall C
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Xiaozhong Liu1, Peter D. Petracek1 and Suzanne R. Abrams2, (1)Valent BioSciences Corporation, Long Grove, IL
(2)National Research Council of Canada, Saskatoon, SK, Canada
The relative potencies of naturally-occurring S-abscisic acid (S-ABA) and the synthetic ABA analog 8'-acetylene methyl-ester ABA (PBI-429) were determined for selected treatment effects on tomato and Pansy.  In tomato, S-ABA and PBI-429 concomitantly decreased transpiration and above-ground fresh weight and height in a log-linear dose dependent manner.  For these three attributes, ABA analog was about ten times more potent than S-ABA.  In Pansy, while ABA analog was about ten times more potent than S-ABA for reducing transpiration and increasing shelf life than S-ABA, the potency of S-ABA and ABA analog were similar for increasing leaf yellowing.  These results illustrate that the relative potencies of S-ABA and ABA analog are not predictable prior to evaluation and suggest that abscisic acid treatment effects on leaf water loss and yellowing may be separable.

Key word: Abscisic acid (ABA); ABA analog, PBI-429; transpiration inhibition; leaf yellowing; leaf wilting

See more from this Division: C02 Crop Physiology and Metabolism
See more from this Session: General Crop Physiology & Metabolism: II