Abstract
A factor increasing an appearance of the NADP-specific glutamate dehydrogenase (NADP-GDH, EC 1.4.1.4) in the germinating seed of wheat ( Triticum durum L.) is shown to be formed in the embryo. A synthetic cytokinin BAP accelerates the formation of the embryonal factor (EF). Like the EF fusicoccin induces NADP-GDH in the isolated nonembryonal part of the seed: the same effect is displayed by Ca 2+ in the presence of ionophore A 23187 and by 2,4-D. The action of the EF, fusicoccin and 2,4-D is abolished by EGTA in the presence of A 23187. The EF has been partially purified by Octyl-Sepharose chromatography and HPLC on Octyl-Si 100; it inhibits [ 3H]dihydrofusicoccin binding to plasma membranes from maize seedling roots.
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