INFLUENCE OF PH ON THE MORPHOLOGY OF TRICHODERMA-REESEI QM-9414 IN SUBMERGED CULTURE

The influence of pH on the germination characteristics and the microsc opic morphology of Trichoderma reesei QM 9414 has been investigated. T he parameters of a kinetic model were estimated by fitting model simul ations to morphological measurements during submerged cultures at diff erent pH values. Both the tip extension rate and the branching frequen cy varied with the pH and had maximum values around pH 4.5. The time o f spore germination was dependent on the pH, but within the used pH-ra nge (2.2-7.6), no significant effect of pH on the fraction of viable s pores was observed.