ДЕСТРУКЦИЯ ФИТОГОРМОНОВ БАКТЕРИЯМИ-СТИМУЛЯТОРАМИ РОСТА РАСТЕНИЙ

Abstract

Phytohormones serve as regulators of plant growth and development, playing a fundamental role in the adaptation and survival of plants under different conditions. It is well-known that bacteria have the ability to influence plant physiology by producing phytohormones or decreasing their concentration in plant tissues and the surrounding environment through degradation or transformation. Studying these processes is crucial for a deeper comprehension of plant-microorganism interactions. This study presents the capability of bacteria that promote plant growth and development to degrade phytohormones (ABA, 6-BAP, and IAA) in a culture medium using them as the sole carbon and energy source. It was discovered that a significant portion of the selected strains could thrive on a medium containing ABA, 6-BAP, and IAA. However, the growth intensity varied significantly among different substrates. For instance, strains Pseudomonas plecoglossicida 2,4-D (2,4-D), Pseudomonas sp. RZ (RZ), and Pseudomonas plecoglossicida CH5%2 (CH5%2) exhibited equal growth rates on all substrates, but high-performance liquid chromatography (HPLC) results indicated that strain 2,4 D was the most efficient in the degradation of the aforementioned phytohormones. The extent of biodegradation of ABA, 6-BAP, and IAA by this strain during a 10-day cultivation period amounted to 33%, 70%, and 60%, respectively.