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Comparative Growth Retarding Activity in Relation to Endogenous Tissue Concentration of Daminozide and a Pyrrolidino Analog (Uni-F529) in Phaseolus vulgaris L. and Chrysanthemum morifolium Ramat
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Abstract
N-pyrrolidino succinamic acid (Uni-F529) was considerably superior to succinic acid 2,2 dimethyl hydrazide (daminozide, SADH) in inhibiting stem elongation in Phaseolus vulgaris F. ‘Black Valentine’ and Chrysanthemum morifolium Ramat. ‘Bright Golden Anne’. This was true in winter or summer greenhouses. Under controlled temperature and light conditions tissue concentrations of daminozide were higher than those for Uni-F529. Neither daminozide nor Uni-F529 was metabolized significantly in beans during the 3 to 7 day test periods. The greater activity of the pyrrolidino analog relative to daminozide must reflect increased activity at the site of action and/or reduced storage of Uni-F529 at inactive sites in plants.