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Cell size, mitotic activity, and nucleic acid content were determined using tips of roots produced by the germination of control, X-irradiated, and thermal neutron-irradiated maize seeds. The dosage levels used had no appreciable effect upon cell width, but small increases in cell length were associated with increasing dose of irradiation. The treatments effected drastic reductions in mitotic activity. A tendency was observed toward decreased amounts of ribonucleic acid per root tip with increasing dose of irradiation, but no consistent relationship was found between desoxyribonucleic acid content and dose.

Influence of Seed Irradiation with X-Rays and Thermal Neutrons Upon Cell Size and Mitotic Activity in Root Tips of Maize