[Effect of antioxidant-ambiol on the radiation adaptive response]

For studying of the mechanism of adaptive response of plants the seeds of soft wheat Triticum aestivum cultivar Moscovskaya 39 were irradiated in doses 0.25, 50 and 0.25 + 50 Gy and the frequency of cells with aberrations and the mitotic activity in the meristem of seedlings were scored. The pre- and post-treatments of seeds with antioxidant--ambiol were also used. It was found that the exposure of seeds to 0.25 Gy reduce the effects of challenge dose of 50 Gy: the mitotic index increases and the frequency of cells with aberrations decreases--the adaptive response appear. It was also found that the pretreatment with ambiol reduce the effects of the irradiation in the dose of 50 Gy. Post-treatment was less efficiently. Both treatments raise the adaptive response. The correlation between the frequency of aberrant cells and the mitotic index was found and, regardless of the type of treatment all points of experiment fall on the common regression line with the regression coefficient -0.85 (p < 0.01). These facts serve as evidence (1) that the radioprotective effect by the pre- and post-treatment occurs by a common mechanism and (2) that the in the exhausted concentration antioxidant does not change the extent of genome damage inflicted by irradiation. The evidence is consistent with the hypothesis that a nonspecific inducible process of stimulated repopulation was a mechanism of adaptive response of plants.