Influence of ABA-metabolizing bacteria on the growth and aba content in wheat plants and soil in dense planting

The influence of abscisic acid (ABA)-metabolizing bacterial strains of the genera Pseudomonas and Arthrobacter on the hormone content in the shoots and roots of wheat plants, as well as in a sandy substrate during dense planting, has been studied. The ability of bacteria to reduce the ABA content in the growing environments and in plants, albeit to varying degrees, was discovered already 10 days after inoculation. At the same time, most of the studied strains were characterized by decrease of ABA in shoots, and suppression of ABA in the roots was observed less frequently. The simultaneous decrease in the hormone in the shoots and in the sandy substrate, which manifested itself under the influence of strains P. plecoglossicida 2.4-D, P. frederiksbergensis IB Ta10m, P. veronii IB K11-1, was accompanied by a maximum increase of wheat weight plants as compared to non-inoculated plants. The studied bacteria to varying degrees stimulated the accumulation of shoot and root mass, as well as leaf area, which could probably be associated with their different ability to synthesize other hormones, such as IAA, and/or influence the hormonal system of the plant itself. The prospects of using ABA-destructor bacteria for the development of agricultural biological products that can mitigate the negative effects of thickened crops and increase resistance to other abiotic factors are discussed.