植物における放射線生物学的研究〔英文〕-4-

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Seeds of Triticum vulgare, Avena sativa (monosomic plants) and A. strigosa were irradiated with gamma-rays from 60Co-source and induced chlorophyll mutations and mutation frequencies were investigated in their X2, X3 and X4 progenies.Chlorophyll mutations were found in two species of oats. In A. sativa, four kinds of chlorophyll mutations, yellow, cream-I, -II and stripe, were obtained. In A. strigosa, nine kinds, albino-I, -II, -III, -IV, -V, whitish cream, cream stripe, yellow stripe and stripe, were obtained. But no chlorophyll mutation was found in T. vulgare.Albino was obtained most frequently and it constituted 46.7% of all the chlorophyll mutants of A. strigosa.Chlorophyll mutation frequency per r-unit per spike or panicle progeny was 0×10-6 in T. vulgare, 3.9×10-6in A. sativa and 7.0×10-6in A. strigosa.Mutants were due to a single or to two independent gene mutations. Some mutants showed significantly lower segregation ratios than the expected ones.
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