Physiological Effects of Gibberellic Acid. II. On Starch Hydrolyzing Enzymes of Barley Endosperm

摘要: Two reports have appeared (15, 22) dealing with the effects of gibberellic acid (GA) on intact germinating barley. Both studies were carried out in an attempt to determine whether or not GA influenced malting behavior barley, and extended earlier observations Hayashi (6) that speeded up germination various processes associated germination, resulting enhancement malt extract yield. GA, both reports, markedly stimulated a-amylase activity increased growth leaf. Sandegren Beling (22) came conclusion reduction time (or, other words, hastening starch hydrolysis, etc.) was due GA's effect embryo growth. The first paper this series (19) presented evidence production reducing sugars increase amylase from treatment barley endosperm GA. Although it has yet been possible demonstrate a direct relationship between grain, several results, such as anion heat effects, liberation maltose, lend circumstantial support importance role hydrolysis isolated endosperm. These results also lead suggestion endogenous gibberellin, present (21), might, fact, play important hormonal during process, prompted closer investigation changes hydrolyzing solutions obtained water, GA-treated It should be borne mind discussed here alone, i.e., after had removed.