Radiation-Induced Chromatid Aberrations in the G1Phase ofCrepis CapillarisCells

SUMMARYAlong with chromosome aberrations, 137Cs gamma-irradiation in high doses induces chromatid aberrations in the pre-synthetic phase G1 of the naturally synchronized cell population of embryonic radicles in C. capillaris seeds. This occurs in seeds with an artificially decreased moisture content.The irradiation of dry seeds seems to induce primary chromosome lesions of two qualitatively different types. In addition to usual short-lived potential lesions appearing in G1 as chromosome rearrangements, long-lived potential lesions that survive till the S phase to be fixed as chromatid aberrations also develop.