Gibberellic Acid and Starch Breakdown in Pea Cotyledons

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Abstract
The stimulation of starch breakdown in the cotyledons of dwarf pea cultivars (Progress No. 9 and Dark Skin Perfection) when treated with gibberellic acid (GA3) is mediated through the removal of metabolites by the axis. When applied to excised cotyledons, GA3 had only a minor effect on starch breakdown, as it did in the cotyledons of a tall pea (cv. Alaska) irrespective of whether they were attached to the plant or excised. Enzyme activity appears to be controlled by the level of soluble sugars in the cotyledons, and GA3delays the increase in amylolytic activity in the cotyledons through a direct effect on cotyledon metabolism.