Section 26
Chapter 25,539

Studies in pectic enzymes of parasitic fungi, III. Secretion of pectic enzymes by Penicillium expansum link

Gupta, S.C.

Proceedings Indian Acad Science Sect B 52(3): 103-109


Accession: 025538950

Highly active protopectinase and polygalacturonase (PG) enzymes were secreted by P. expansum on 2.5% decoction of lucerne, pectin asparagin and modified Czapek's media. Ammonium nitrate was found to be a better N source for the secretion of pectic enzymes than asparagin or sodium nitrate. Best secretion of protopectinase was in cultures after 4 days incubation at 20[degree] C. Pectin-esterase, when tested at 6.2 pH, was found to be of negligible activity in 4-day old cultures of the fungus. Protopectinase and polygalacturonase (PG) were found to be adaptive enzymes which were not produced in absence of pectic substances.

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