Radiosensibility of higher plant seeds after space flight.
The influence of long-term storage of higher plant seeds under space flight conditions (49 to 827 days) on their radiosensibility was studied in the experiments on the orbital stations Salyut 6 and 7. Short-term storage has been proved to have no effect on radiosensitivity of Crepis capillaris seeds. Only in the case of maximal exposure duration the frequency of chromosome aberrations in post-flight irradiated seeds significantly exceeded the chromosome aberration frequency in the ground-based irradiated control. A statistically significant increase in the number of cells with multiple chromosome aberrations was also observed in this experiment. After gamma-irradiation of Arabidopsis thaliana seeds the germinating ability and survival rate of plants decreased depending on the duration of seed storage. Flight-exposed seeds were more sensitive to irradiations with respect to these parameters. A statistically significant increase in the frequency of recessive lethal mutations was observed only in two experiments of long exposure duration.
Vaulina
E
E
Institute of General Genetics, USSR Academy of Sciences, Moscow.
Anikeeva
I
I
Kostina
L
L
D017360:Arabidopsis / Q000235:genetics / Q000528:radiation effects*; D019659:Asteraceae / Q000235:genetics / Q000528:radiation effects*; D002869:Chromosome Aberrations; D005720:Gamma Rays; D018519:Meristem / Q000235:genetics / Q000528:radiation effects; D018517:Plant Roots / Q000235:genetics / Q000528:radiation effects; D011836:Radiation Tolerance; D011853:Radiobiology; D012639:Seeds / Q000235:genetics / Q000528:radiation effects*; D013026:Space Flight; D014893:Weightlessness