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SUMMARY Mutations in the acu-I gene which lead to inability to use acetate as sole carbon source have been used to select recessive suf gene mutations. Of five acu-I alleles tested, two, designated mu-1-2 and ucu-1-4, were suppressible. At least three dif- ferent suf genes suppressed the acu-1-2 mutation and two mf genes suppressed the ucu-1-4 mutation. All five sw mutations are completely allele specific and will only suppress the acu-r mutation for which they were selected. On a glucose medium, where SU~ activity is not required for growth, presence of a su+ gene de- presses the growth rate. These two facts suggest that the sill genes act by causing translation errors. Although individually each SU+ gene is recessive in a sii+/siI heterozygote, any two sit+ genes in a double heterozygote do not complement. Recessiveness and non-complementation are considered as properties of missense su+ genes involving modified tRNA species and interpreted in terms of sti- tRNA concentrations. IN T R 0 I> U C T I0 N

Non-complementation and Recessiveness as Properties of Missense Suppressor Genes in the Fungus Coprinus