Abstract
For experiments, endophytic strains B. subtilis 26D, B. subtilis 11VM, B. thuringiensis B-6066 and two isolates of Bacillus sp. isolated from wheat leaves growing on the territory of the Republic of Bashkortostan Bacillus sp. Tas1 and Tas8.2 were selected. These strains and isolates produced lipopeptides of three families: surfactins, fengycins, and iturins. We obtained lipopeptide-rich fractions (LRF) from the cultivation medium of all strains and isolates. The aim of the work was to select growth-promoting and immunostimulating concentrations of bacterial strains and isolates and their LRFs, which are capable of modulating different types of resistance (antibiosis and endurance) of wheat plants against Greenbug aphid Schizaphis graminum Rond. Growth-promoting concentrations for bacterial suspensions were selected in the range of 1.0–2.0 μl of suspension per 1 g of seeds, and for LRF within 1.5–2.5 μg/ml. Treatment of seeds with bacterial suspensions and their LRF increased germination and elevated the growth of wet and dry biomass in test for effectiveness of biocontrol agents (GOST 12038-84). Bacteria and their LRF at growth-promoting concentrations indirectly increased plant endurance, which was expressed in leaf growth, and enhanced mortality of the pest that fed on plants treated with bacteria or LRF. All studied bacterial strains and isolates are promising for protection of wheat plants from cereal aphids.
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