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The population dynamics of associative nitrogen‐fixers Azospirillum lipoferum 137, Arthrobacter mysorens 7, Flavobacterium sp. L30 and phosphate‐solubilizing strain Agrobacterium radiobacter 10 in soil and the rhizoplane of inoculated plants was studied in pot and field experiments. All of the present strains were able to actively colonize the rhizoplane of barley, wheat, oat, tomatoes, rape, and alfalfa. For the most part the population size and dynamics of introduced bacteria depended only slightly on the plant genotype and soil conditions. The overall pictures of survival of the strains in soil and on plant roots were similar. The reliable effect of inoculation on plants was observed only in individual cases. No correlation was established between survival of introduced bacteria and their effect on plant development. It was concluded that the influence of plants on survival of bacteria was not specific. In contrast, the plant response to inoculation was conditioned to a greater extent by the plant genotype.

Resume In order to assess factors contributing to stress reactivity of blood pressure 66 adolescents (25 boys and 41 girles) form 14 to 17 yrs (15,2+0,1 yrs) were examined. Test with oral calculation, psychological (questionnaires of Bass-Darky, Kettle, Spielberg) as well as force of skeletal muscles and were assessed. Hyperreaction of blood pressure (BP) was observed in 27% of adolescents, normal reaction - in 47% cases, low reactivity - in 26%. In hyperreactive subjects lower parameters of skeletal muscle force were documented. Psychological discrepancies were insignificant between the groups. The BP raise during mental stress correlated with muscle force, body weight, baseline BP level and mental development. The data obtained can indicate that reducing stress reactivity can be important instrument in primary prevention of cardiovascular diseases in psychogenic rest groups.