Abstract
Embryo/scutellar tissue of pre-mature wheat grains usually contains little α-amylase but readily produces the enzyme upon removal from the caryopsis. Enzyme production is accompanied by cytological changes in the scutellar epithelium cells characteristic of germinating mature embryos, although α-amylase production by pre-mature tissue is not always associated with germinative growth of the embryonic axis. Production of α-amylase is influenced by embryo age, stimulated by GA3 and overall is inhibited by ABA. Examination by isoelectric focussing and rocket-line immuno-electrophoresis reveals the presence of both α-AMYl and α-AMY2 isoenzymes, the latter being the major constituent. In the presence of ABA certain α-AMY2 isoenzymes not detected previously are observed.
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