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Plant and Cell Physiology, 1974, Vol. 15, No. 2 195-204
© 1974

Article

Perithecial formation in Gelasinospora reticulispora II. Promotive effects of near-ultraviolet and blue light after dark incubation

Yasunori Inoue and Masaki Furuya

Department of Botany, Faculty of Science, University of Tokyo Hongo, Tokyo 113, Japan

Hyphae of Gelasinospora reticulispora growing on corn meal agar at 25°C required light of form perithecia. This response to light was highly correlated to the length of the preliminary dark period, i.e. the photoinduction of perithecia never occurred in cultures grown in the dark for periods of 27 hr or less, whereas hyphae became photosensitive if incubated for 30 hr or longer in the dark. The perithecia became simultaneously visible with the 30 to 48 hr dark-grown hyphae irrespective of the different dark periods, but time courses for cultures having 54 hr or longer of darkness were dependent upon the time when light was given.

Light induced perithecia only in the dark-grown portions of the hyphae. The longer the dark period, the more the sensitivity to light increased when the most effective range of wavelenghts was shifted from near-ultraviolet to blue. Light of green and longer wavelenghts was not at all effective irrespective of the duration of darkness. The photoinduced stimulus was not movable from the irradiated to the unirradiated portions.

(Received August 3, 1973; )
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