ABSTRACT
The hormone abscisic acid was found to inhibit the gibberellin response. The hormone abscisic acid inhibits the gibberellin-induced synthesis of alpha-amylase and it may be important in maintaining dormancy in cereals. Convincing evidence that the newly-formed hydrolases are synthesised de novo from amino acids in the aleurone tissue has been obtained from labelling experiments using radioactive and heavy isotope-labelled precursors. The control of lipolysis and fatty acid catabolism in germinating cereals has not been extensively studied and it remains poorly understood. In contrast to the situation with lipase, gibberellin can replace the embryo in possible role. The embryo-controlled mobilisation, on the other hand, corresponds to the appearance of neutral lipase activity in the tissue. The hormonal control of membrane morphogenesis and metabolism in the cereal aleurone tissue has been studied by several groups of workers and a fairly clear if incomplete several groups of workers and a fairly clear if incomplete picture is emerging.
