Abstract
DEVELOPMENT OF A HIGH-YIELDING UV-MUTANT STRAIN OF VOLVARIELLA VOLVACEA FROM THE NIGERIAN STRAIN VNW
Adewoyin A. G.,*, Barooah M. and Oloke J. K.
ABSTRACT
Volvariella volvacea is a fast-growing edible mushroom with a low yield that has greatly limited its commercial cultivation compared to other commercially cultivated mushrooms. Mutagenesis was induced by UV irradiation in the C region at varying distances and time intervals. Phylogenetic analysis suggests a close relatedness of surviving and mutants to the wild strain than to other strains considered. Comparative fructification of fast-growing mutants and other strains was carried out using rice straw as substrate. Mutant M5 (UV irradiation for 75min from a distance of 60cm) exhibited exceptional growth qualities at 35ºC and pH 6.0. The mutant also showed a significantly (? ? 0.05) higher growth rate and yield (Biological Efficiency of 23.98%) and a significant (? ? 0.05) improvement in the nutrient composition. This study highlights the development of a high-yielding UV mutant strain from the Nigerian wild stain that is suitable for commercial cultivation.
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