Abstract
The forward mutation frequencies of four genes for albinism in barley were studied by means of treatments with x rays and ethyl methanesulfonate. The method consisted in scoring the number of chlorophyll deficient streaks on leaves of the M/sub 1/ plants, comparing heterozygous and homozygous strains. The genes analyzed were alb/sub t/, alb/sub 20/ alb/sub 14/, and alb/sub 15/. All of them mutated in x rays. ( auth) ments with similar frequency. The ethyl methanesulfonate, on the other hand, gave mutations in alb/sub t/ and none in the other three genes. It is concluded that ethyl methanesulfonate has a selective mutagenic effect. This chemical is a more efficient as well as a more effective mutagen than x rays. (auth)
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