Effect of 5 fluorouracil on the soluble RNA of Trichoderma

Morphological and colour mutants of Trichoderma viride: characterization and complementation

A total of 26 morphological and colour mutants of Trichoderma viride were characterized. They were divided into three groups based on morphology, pigmentation, growth rates and intensity of conidiation. Complementation analysis of colour mutants and mutants with disturbances in conidiation showed that after anastomosis and protoplast fusion only heterokaryotes are formed while no nuclear migration and diploidization takes place.

Inhibition of photo-induced Trichoderma viride conidiation by inhibitors of RNA synthesis

The photo-induced conidiation of Trichoderma viride is suppressed by ethidium bromide, acriflavin, lomofungin and 8-quinolinol at concentrations which do not inhibit the colony growth of this deuteromycete.

Complementation in nonconidiating mutants of Trichoderma

Nonconidiating (Con(-)) mutants were isolated from wild-type and color mutants of the fungus Trichoderma viride Pers. ex Fries. Heterokaryons were easily produced and maintained, and the complementation relationships among the Con(-) mutants were established. Most Con(-) mutants could complement one or more of the other Con(-) mutants. When marked Con(-) mutants were mixed with marked Con(+) testers, conidiating heterokaryons were formed. The conidia thus obtained produced only the parental type colonies after replating, indicating that nonconidiation is a nuclear characteristic. Allowing two Con(-) colonies to meet and produce a heterokaryon, it was found that the migration of nuclei reached a rate of 5 mm per hr, which is several times greater than the rate of hyphal elongation; it was also found that heterokaryosis of a mycelial region preceded its ability to conidiate.