Effects of Penicillium frequentans and its antibiotics on unmelanized hyphae of Monilinia laxa.
1994
Cal A. de | Melgarejo P.
The effect of Penicillium frequentans and its antibiotics on the unmelanized mycelium of Monilinia laxa in culture has been investigated. An albino mutant of M. laxa obtained by ultraviolet radiation was utilized. Nonfungitoxic concentrations (10 ppm) of pvroquilon (1, 2, 5, 6-tetrahydropyrrolo[3, 2, 1-ij]quinolin-4-one) were also used to inhibit melanin biosynthesis in the pathogen. P frequentans and its antibiotics induced a progressive lysis on unmelanized hyphae of M. laxa. After 14 days of incubation, more than 60% of these hyphae contained empty cells. At day 35, many hyphae were partially lysed. When 10 ppm of pyroquilon was added to the media, crude antibiotics also induced lysis on 24-h-old germ tubes. Unmelanized colonies showed poor production of macroconidia and microconidia. The significance of these findings is discussed.
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