[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.

[On antimutagenesis mechanism in plants].

The effect of nitrosylmethylurea (NMU) on the mitotic index and the frequency of cells with aberrations, as well as the effects of pre- and posttreatment with antioxidant ambiol on the NMU effects were studied on seedlings of common winter wheat Triticum aestivum, cultivar Moskovskaya 39. Both pre- and posttreatment with ambiol resulted in antimutagenic effect but after posttreatment, the effect was lower. Irrespective of type of seedling treatment with ambiol and the time of their fixation (45, 48, and 51 h), when mitotic index is plotted versus frequency of cells with aberrations, all experimental points fall on the same regression line with coefficient of correlation of -0.

[Stimulated repopulation as a basis of antimutagenesis and the adaptive response in plants].

Wheat seeds were used to study (1) modification of the radiation adaptive response (AR) with antioxidant anphen and (2) modification of the clustogenic effect of N-methyl-N-nitrosourea (MNU) with various agents. Pretreatment with anphen enhanced AR. Each pretreatment (irradiation with 0.

[Radiation adaptive response in wheat. Phenomenology and possible mechanism].

It was demonstrated that preliminary irradiation of wheat seeds with doses of 0.10 and 0.25 Gy reduced the sensitivity to the clastogenic action of the challenge doses of gamma-irradiation at 10 and 20 Gy, but not to a doses at 50 and 100 Gy.

[Effect of Agrobacterium tumefaciens (Smith and Town). Conn. on the functional properties of human blood lymphocytes].

Agrobacterium tumefaciens has been shown to affect the proliferation of intact lymphocytes as well as lymphocytes stimulated by PHA action. Inoculation of bacteria into the cultures of intact lymphocytes and incubation during 72 h resulted in increased incorporation of [3H]-thymidine into the DNA of cultivated cells. The bacteria are capable of inhibition of lymphocytes proliferation stimulated by PHA.