Interactions Between Gibberellic Acid and Phosfon D on the Expansion Growth of Leaf Disks of Bean

The effects of gibberellic acid (10, 20, 50 and 100 ppm) and Tributyl-2, 4-dichlorobenzyl phcsphonium chloride or phosfon D (100, 250 and 500 ppm) and their interactions on the expansion growth of leaf disks of bean (Phaseolus vulgaris L, cv. Sutton's Masterpiece) were investigated. GA₃ elicited high degree of growth stimulation whereas phosfon D proved highly inhibitory. Phosfon D reduced the growth stimulation elicited by GA₃. On the other hand GA₃ could to a great extent eliminate the inhibitory effect of phosfon D. Thus, a marked antagonism between the two compounds ensued.