DOSE RATE DEPENDENCE OF MUTATION RATES FROM γ-IRRADIATED POLLEN GRAINS OF MAIZE

It has been well known that the frequency of mutations induced by ionizing radiation is in various organisms directly proportional to the dose.However it has been considered that radiation-induced mutation in the characters of maize endosperm is usually the result of chromosome aberration rather than gene mutation (Stadler 1931; review by Brewbaker and Emery 1962); it has been also reported that somatic mutations in snapdragon are due to minor chromosome deficiencies (Sparrow et al. 1961 and others).