Kinetin reversal of the synergistic inhibitory effect of 2,4-dichlorobenzyl-tributylphosphonium chloride and coumarin on the germination of brassica oleracea L. var.acephala Seeds

Kinetin (10-4 m) is initially more effective than GA (10-4M) in reversal of the inhibitory effect of Phosfon D (10-3m) on the germination of kale seed (Fig. 2 and Fig. 3). Kinetin is about 2.5 times more effective than GA in reversal of the synergistic inhibitory effect of coumatin (100 p.p.m.) plus Phosfon D on germination of kale (Fig. 2 and Fig. 4); initially most effective in this respect is a supraoptimal concentration of kinetin, 5 x 10-4M, which markedly inhibits germination in the control. It seems that kinetin, Phosphon D and coumarin act specifically on the process of germination. It is suggested that in the germinating seed of kale Phosfon D and coumarin block alternative metabolic pathways, induced by kinetin.