PANTOTHENIC ACID REQUIREMENT FOR SPORE COLOR IN NEUROSPORA CRASSA

Abstract

Crosses of strains of Neurosopora crassa grown on medium with limiting pantothenic acid, where 1 of the strains carried an allele for the pan-2 locus, resulted in asci with a 1:1 segregation of dark:pale spores. Crosses in which the strains were mutant for different alleles of the pan-2 locus resulted in the production of pale spores, except where recombination had taken place, or pseudowild types were formed with respect to the pan-2 locus. Spores of the latter types were dark colored. Crosses involving an allele for the pan-1 locus, grown under similar conditions, showed no spore color segregation.