[en] Full text: Researches of plants extracts as perspective means of reduction of consequences of influence mutagenian factors of an environment gets the increasing urgency. The search of the proof-readers of the mutation of the process allowing to adjust stability organisms to increase of a radiating background in a usual ecological situation, has revealed presence of biologically active substances in crates of plants having anti-mutagenian properties. Proceeding from above-stated, purpose of the present research was the study of interrelation gene protection of action water-alcohol of an extract from kiwi fruits (EKF) with its influence on induction process free - radical and peroxide of oxidation lipids. The experiments are executed on white bread less mature rats with average weight 160 10 g. The circuit of experiments provided application EKF (0,2-0,5 mg/100 g) before influence of a gamma-irradiation (3 Gr). Alongside with the analysis of frequency induction of structural reorganizations chromosomes in cells bones of a brain thigh bones of rats, on variants of experiments registered the quantitative contents in mitochondrial of a fraction of a liver of an intermediate product free - radical and peroxide of reactions - malon dialdehid (MDA), being the indicator of speed of the given processes. Controls served intact and subjected to influence ionization of radiation. As a result of experiments is established, that the irradiation increases frequency induction chromosomes aberration in crates bones brain on a background of increase of the quantitative contents MDA in a liver of animals. It testifies to interrelation of occurrence of structural reorganizations chromosomes with intensity of formed processes of free - radical oxidation lipids. So, at influence ionization of radiation the frequency of structural reorganizations grows with 1,92 0,48 up to 15,10 1,21, contents MDA - with 2,23 0,20 up to 6,61 0,56 nmol/mg a protein . The introduction in the circuit of experiments EKF up to an irradiation of animals is reduced frequency induction chromosomes aberration with 15,10 1,21 up to 6,0 0,80 and quantitative contents MDA in a liver rats with 6,61 0,56 up to 4,18 0,31 nmol/mg by a protein with the highest efficiency in a doze 0,4 mg/100 g. At introduction EKF after influence mutagen, the registered events carry some other character. In this case on a background of authentic reduction of genetic changes, despite of the tendency to normalization of processes cells metabolism, the distinctions on variants of experiments to a parameter inductor statistically do not differ and are within the limits of a mistake of the analysis. The results of experiments allow to conclude, that one of mechanisms gene protection of action EKF is the prevention of processes free - radical and peroxide of oxidation lipids and restriction of formation of toxic intermediate products of the given reactions, that takes place at introduction of an extract up to an irradiation of animals. At the same time, high enough anti-mutagenian efficacy of an extract at its introduction after influence of radiation, that is after formation of primary damages of a molecule DNA, on a background of absence of its influence on registered processes of cells metabolize specifies that, in this case, effective protection genome of EKF, basically, is connected with regulation by it activity of reparation systems