Untersuchungen zum temperaturbedingten Wachstum einiger Pilze unterschiedlicher systematischer Stellung bei verschiedenen Stickstoffquellen und -konzentrationen)

Abstract

Summary Phycomyces blakesleeanus, Botrytis spec., Agaricus bisporus, var. albidus, Clilocybe clavipes, Lentinus tigrinus, Polyporus melanopus and Sphaerobolus stellatus differ considerably in their growth rate as well as in the position of the cardinal points of temperature of their growth. The growth rate is ascertained by the “Planimetric Method”. Chemical defined and half-synthetic solid culture media are used as culture substratum. Adding several nitrogen sources of different concentrations, an influence on the effect of growth at a temperature-optimum, -maximum and -minimum can be observed. Hereby conclusions of the behaviour of resistance can be drawn off. Compared to the inhibitory effect resp. furthering effect of the nitrogen admixture, the experiment fungi can be divided into two groups: for fungi of the 1st group, the inhibitory effect of the nitrogen components is the slightest on full synthetic as well as half-synthetic culture media at an optimum temperature; at a minimum temperature it is nearly equal. Regarding the fungi of the 2nd group, the injuring effect is getting eventually less from minimum over optimum to maximum, so that here, even a furtherance of the growth rate can be observed. Taking into account every difference in detail, the inhibitory effect resulting from the admixtures nitrogen components and with it, the reduced resistance against extreme temperatures, are by far greater than the furthering effect. Nevertheless, in individual case, a positive effect can result from the applied nitrogen source.