[Employment of associative bacteria for the inoculation of barley plants cultivated in soil contaminated with lead and cadmium]. / Ispol'zovanie assotsiativnykh bakterii dlia inokuliatsii iachmenia v usloviiakh zagriazneniia pochvy svintsom i kadmiem.

In laboratory experiments, the rhizobacteria Azospirillum lipoferum 137, Arthrobacter mysorens 7, Agrobacterium radiobacter 10, and Flavobacterium sp. L30 were found to have a relatively high resistance to the toxic heavy metals lead and cadmium (except that strain L30 was found to be sensitive to Cd). When introduced by means of seed bacterization, the heavy metal-resistant strains actively colonized the rhizosphere of barley plants cultivated in uncontaminated and contaminated soils. In both pot and field experiments, seed bacterization improved the growth of barley plants and the uptake of nutrient elements from soil contaminated with Pb and Cd. The bacterization also prevented the accumulation of Pb and Cd in barley plants, thereby mitigating the toxic effect of these heavy metals on the plants.

[A new metabolite with fungistatic and bacteriostatic activity, produced by strain L-30 of Flavobacterium sp]. / Novyi metabolit s fungistaticheskoi i bakteriostaticheskoi aktivnost'iu, produtsiruemyi shtammom L-30 Flavobacterium sp.

Flavocin, an agent with fungistatic and bacteriostatic activities, was isolated from the culture of Flavobacterium sp. L-30. The data on the physico-chemical and biological properties of flavocin A, the major active component, are presented. The component was identified with metabolites of the genus Flavobacterium and other genera of nonsporulating bacteria. Flavocin was highly efficient in the treatment of various farm crops. The antagonistic effect of flavocin was observed under field conditions in growing sugar beet, barley, spring wheat, potato and grape. Presowing and nonradical exposure to flavocin lowered the affection of the plants with brown patch, scab, soft rot and oidium.