Abstract
Changes in relative mutation frequencies in maize endosperm were studied after visible light treatment of u.v. or γ-irradiated pollen grains. For the u.v. irradiated groups, mutation frequencies of whole endosperm mutants were considerably decreased by post treatment with visible light, while the frequencies of partial mutations (chimeras) were slightly increased by the treatment. By a similar post treatment of γ-irradiated pollen the mutation frequencies were not modified.
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