PHOSPHOINOSITIDES AND INOSITOL PHOSPHATES IN GROWTH AND PHOTOCONIDIATION OF TRICHODERMA-VIRIDE

Incorporation of H-3-inositol and P-32 into the mycelium of Trichoderm a viride shows that this fungus contains phosphoinositides (PI) and in ositol phosphates (IF). Under conditions suitable for the induction of photoconidiation, a pulse of light did not elicit a change in the inc orporation of P-32 but decreased the incorporation of H-3-inositol int o PI. The incorporation of H-3-inositol into IP was unaffected by ligh t. Inhibitors of PI metabolism, Li+ and neomycin, inhibited more effec tively photoconidiation than vegetative growth. The distribution of th e H-3-inositol label in inositol phosphates was not changed by the lig ht pulse.