Influence of Penicillium frequentans and two of its antibiotics on production of stromata by Monilinia laxa in culture

Abstract
The influence of an isolate of Penicillium frequentans and two of its antibiotics on the mycelium of Monilinia laxa in culture has been studied using light and electron microscopy. Penicillium frequentans and antibiotic B induced the development of continuous stromata in cultures. Stroma production in colonies exposed to antibiotic A is rhythmic, with alternating zones of normal development of the mycelium. Abundant pycnidium-like structures, within which microconidia of M. laxa were formed, were produced on the induced stromata of cultures exposed to Penicillium and antibiotic A. The presence of melanin-like pigments in normal and induced stromata of M. laxa was also demonstrated and quantified.

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