[Regulation of various hydrolase activities in the myxomycete Physarum polycephalum]

Abstract

In a standard growing medium, the specific activities of acid-phosphatase, beta-galactosidase and beta-glucosidase of Physarum polycephalum increase during the growth of the culture. The decrease of the pH of the culture medium during the growth has no effect on the variations of these hydrolase activities. In a glucose-starved medium, the specific activity of beta-galactosidase increases up to 350% of its initial value in 24 h, whereas the specific activities of acid phosphatase and beta-glucosidase stay near their minimal level.