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Dark-Period Induction of Zygospores in Mucor
C. W. Hesseltine and Ruth Rogers
Vol. 79, No. 2 (Mar. - Apr., 1987), pp. 289-297
Published by: Mycological Society of America
Stable URL: http://www.jstor.org/stable/3807661
Page Count: 9
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This study was conducted to test the hypothesis that the factor responsible for erratic mating behavior among certain Mucor species is a requirement for an induction period of darkness. Zygospores are formed with continuous natural or artificial light after a dark period. When strains are mated near one another (10 mm apart) and far apart (70 mm) in the same plates, zygospores typically form in the close matings but rarely in the far matings even though the colonies grow together. At 25 C and 20 C the dark effect is pronounced except for M. lusitanicus; at 32 C the effect is less. When 8½ h of light and 15½ h of darkness were alternated, some zygospores were produced from da 2 onward, but the numbers, even at da 5, were greatly reduced. Zygospores of the homothallic M. genevensis were formed in both light and darkness but more developed in the dark. When various isolates from ragi were contrasted with appropriate mating types and exposed to daylight and darkness no zygospores were usually formed in the light, but in darkness all but one strain produced numerous zygospores. Different wavelengths of light had little effect on zygospore formation.
Mycologia © 1987 Mycological Society of America