Interaction of Succinic Acid-2,2-Dimethylhydrazide and Gibberellic Acid on Dwarf Bean and Dwarf Corn

Abstract

Although succinic acid-2,2-dimethylhydrazide (Alar) is usually classed as an antagonist of gibberellins, it does not inhibit synthesis of gibberellin in Fusarium (Ninneman et al. 1964; Dennis, Upper, and West 1965), nor inhibit release of reducing sugars from barley endosperm by gibberellic acid (GAa) (Paleg et al. 1965) or interact additively with ammonium(5-hydroxycarvacryl)trimethyl chloride piperidine carboxylate (Amo 1618) or (2-chloroethyl)trimethylammonium chloride (CCC) (Moore 1967). In addition, Alar reverses inhibition of growth of rice plants induced by CCC (Hishra and Paul 1967). In this paper we show that while Alar antagonizes the action of GAa in dwarf bean, it shows positive synergism with GAa in stimulating the growth of the first leaf sheath of dwarf corn (d1).