ИСТИНА

Using the 120-cm cyclotron we studied the effect of alfa-particles under conditions of normal and low geomagnetic field on chromosomal damage lettuce seeds Latuca sativa L., belonging to the intended composition BLSS during long distant flights. Irradiated seeds with different values of absorbed doses were germinated in a different attenuation of the geomagnetic field. The result of exposure to ionizing radiation and the HMC was estimated by the number of chromosomal damages in first mitosis of seedling root meristem. As a result of the experiments there was a trend to increased levels of chromosomal aberrations in irradiated seeds. Under cytogenetic analysis after germination of irradiated and non-irradiated seeds in HMC there was observed a tendency of increase in the percentage of chromosomal aberrations, cells with multiple aberrations, as well as the percentage of chromosomal bridges in comparison with seeds, germinated in the laboratory condition.