Volume 10 Part 1 Article 55: Investigations of Primordia Formation in the Pleurotus ostreatus Dikaryon ‘868 × 381’

Volume 10 Part 1 Article 55
Year 1979
Title: Investigations of Primordia Formation in the Pleurotus ostreatus Dikaryon ‘868 × 381’
Author: U. Von Netzer

Abstract:

In the Basidiomycete Pleurotus ostreatus, primordia formation is induced by light, whereby the number of primordia formed can be regulated by choosing appropriate light intensities and by adding certain nitrogen sources. Hereby the mycelia must be cultivated under the exclusion of light with wavelengths <600 nm until a certain “optimal diameter” is reached. In continuous darkness no primordia are formed (Eger, 1970a,b). In the experiments carried out by Eger et al. (1974) the strain “868 x 381” proved to be much more sensitive to light than other strains. The number of primordia formed already increases steadily at very low light intensities and reaches an optimum at 800 lux This strain was used m a Ph.D. thesis for a thorough investigation of hypotheses concerning fruiting initiation (v. Netzer, 1978). It could be proved that in Pleurotus ostreatus there is no sign that a general “Fruitmg-Body-lnducing Substance” plays an important part m the fructification process. Neither does a higher level of cAMP m the hyphae cause primordia formation Some results from this thesis which may serve as starting-points for further investigations, are given here.

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