The effects of gamma irradiation on the production and secretion of enzymes, and on enzyme activities in barley seeds

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Abstract Gamma-rays at mega rad quantities inhibited de novo synthesis and secretion of some enzymes in barley seeds during germination. The degree of inhibition, when the daily increase of enzyme activities was calculated, increased with the length of the germination period, up to the time of a maximum enzyme activity for each enzyme. Even though there was a decrease in the production and secretion of enzymes, there was no significant delay in the initiation of these processes. Gamma-rays also inhibited enzyme activities in resting and germinated barley seeds. The enzymes studied were divided into two groups—those sensitive to and those resistant to gamma irradiation. The enzymes of the sensitive group (phosphomonoesterase, phosphodiesterase and ATPase), were those which metabolize phosphate compounds. The enzymes of the resistant group (α- and β-amylase, β-glucosidase, β-galactosidase, and β-1, 3-glucanase) were those which metabolize carbohydrate compounds.

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