Abstract
Zalokar, Marko. (Yale U., New Haven, Conn.) Enzyme activity and cell differentiation in Neurospora. Amer. Jour. Bot, 46(7): 555–559. Illus. 1959.—Morphological differences were observed in vegetative cells of Neurospora of different ages and in different parts of the mycelium. The surface layer of mycelium grown in standing cultures could be separated from the deep layer. The first contained most of the growing hyphae rich in protoplasm, while the second contained heavily vacuolated hyphae laden with fat droplets. Specific activities of several enzymes were studied in conidia, young hyphae, and the surface and deep layers of mature mycelium. Succinic dehydrogenase was low in conidia and about 10 times more active in mature mycelium. The surface layer had twice the activity of the deep layer. Aldolase increased about 3 times after the germination of conidia; it was slightly lower in the surface than in the deep layer of mycelium. Tryptophan synthetase exhibited only small differences between conidia and mycelium and was slightly lower in the surface than in the deep layer. β‐galactosidase was formed in appreciable amounts only after prolonged growth and had a much higher specific activity in the deep layer. The results were discussed in connection with cell differentiation and aging.
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