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Inhibition of the growth of grain-storage molds in vitro by the yeast Pichia anomala (Hansen) Kurtzman.

Bjornberg, A.; Schnurer, J.;

Canadian Journal of Microbiology Year: 1993 Vol: 39 Issue: 6 Pages: 623-628 Ref: 30 ref.

1993

บทคัดย่อ

Inhibition of the growth of grain-storage molds in vitro by the yeast Pichia anomala (Hansen) Kurtzman.

The potential use of yeasts to control grain-storage moulds was evaluated by coculturing the yeast Pichia anomala with Penicillium roquefortii and Aspergillus candidus on agar plates, using different temperatures, water activities (aw), and nutrient concn. Addition of 10 p.p.m. cycloheximide to malt-extract agar inhibited P. anomala completely without affecting mould growth, making it possible to quantify the inhibition as a reduction in colony-forming units (c.f.u.). For A. candidus, numbers of c.f.u. and hyphal lengths were reduced at an initial yeast concn of 104 cells/plate and reduced below detection limit at 108 cells/plate. A clear reduction in growth of P. roquefortii was only observed at 108 yeast cells/plate. The antagonistic effect was more pronounced at low (6, 15 deg C) and high (30, 37 deg C) temp. than at ambient ones. P. anomala inhibited growth of both moulds more strongly in a substrate-rich medium than in a medium with a low substrate content. In water agar (low substrate conc

n) the degree of inhibition of P. roquefortii was greater at 0.96 aw than at 0.93 aw.