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- W4252173090 abstract "SUMMARYPerithecia (ascostromata) of the loculoascomycete Leptosphaerulina trifolii (Rost.) Petr. may develop in culture in darkness, but usually they are much more abundant in colonies exposed to light. By selecting and isolating from nonsporulating sectors occurring in dark-reared colonies, an experimental isolate was obtained that rarely sporulated in darkness but which produced abundant perithecia when exposed to light. Only UV wavelengths (<350 nm approx.) stimulated perithecium formation when colonies were exposed to filtered light from a combination of near-ultraviolet and daylight fluorescent lamps.Extensive monochromatic radiation studies were conducted using wavelengths from 240–360 nm at 5 nm intervals (5 nm bandwidth). Results of these studies indicated that only wavelengths <370 nm (approx.) stimulated perithecium formation. An action spectrum derived from these results shows prominent peaks of effectiveness at 265, 287 and 300 nm. Increased effectiveness of wavelengths <250 nm was also evident but these results were inconclusive. The action spectrum for L. trifolii is very similar to that previously reported for perithecium induction in Pleospora herbarum (Pers.) Rabenh.Perithecia resulting from a single exposure of vegetative colonies to monochromatic UV (240–360 nm) in all instances developed mature asci following an additional few days of incubation in darkness. There was no evidence that maturation of asci required an additional exposure to light. Optimum temperatures favoring the development of perithecia following exposure to UV, was 24.0-26.6 C which was a slightly narrower range than that favoring linear growth (21.0-24.5 C)." @default.
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- W4252173090 date "1972-05-01" @default.
- W4252173090 modified "2023-09-27" @default.
- W4252173090 title "An Action Spectrum for Light-Induced Sexual Reproduction in the Ascomycete Fungus Leptosphaerulina trifolii" @default.
- W4252173090 doi "https://doi.org/10.2307/3757865" @default.
- W4252173090 hasPublicationYear "1972" @default.
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