Plant and Cell Physiology, 1985, Vol. 26, No. 6 1175-1183
© 1985
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Action Spectra for Stimulatory and Inhibitory Effects of UV and Blue Light on Fruit-Body Formation in Coprinus congregatus
1 Laboratoire de Différenciation fongique, Université Lyon I 69622 Villeurbanne Cedex, France
2 Division of Biological Regulation, National Institute for Basic Biology Okazaki 444, Japan
3To whom correspondence should be addressed
Spectral sensitivity for stimulatory and inhibitory effects of light on fruit-body formation in Coprinus congregatus was determined between 250 and 730 nm using the Okazaki Large Spectrograph. Eight-day-old dark grown cultures were exposed to varying amounts of monochromatic photon fluences for 60 s. Primordial initiation was strictly localized in the youngest hyphae of the culture. After a dark period of 24 h at 25°C, the primordial initiation was assayed by counting the number of primordia. The action spectrum showed peaks of effectiveness at 260, 280, 370 and 440 nm. The quantum effectiveness at 280 nm was 4 times higher than that at 440 nm. The lethal effect of far UV (260–280 nm) was demonstrated when using 100 times higher photon fluences than that inducing primordial formation.
The primordia growing in continuous light required an uninterrupted dark period for 5 h at 25°C to produce sporulating fruit-bodies. A brief exposure to light during the dark period inhibited the development of primordia. The action spectrum for this photoinhibitory effect showed maxima at 280, 350, 380, 440 and 460 nm. The quantum effectiveness at 280 nm was Ca. 1.3 times higher than that of blue light. The spectral sensitivities for primordial initiation and for inhibition of primordial development were quite similar and suggested a common photoreceptor during fruit-body morphogenesis.
4 Permanent address: Botany Department, Faculty of Science, University of Tokyo, Hongo, Tokyo 113, Japan.
(Received February 12, 1985; Accepted July 2, 1985)
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