Effects of Plant Growth-Promoting Rhizobacteria on the Physioecological Characteristics and Growth of Walnut Seedlings under Drought Stress

Drought is one of the most brutal environmental factors limiting productivity fruit trees. The search for new and efficient microorganisms from unexplored environments that can be used to mitigate negative effects water stress an interesting alternative alleviate drought experienced by plants. This study aimed determine PGPR inoculation on growth physioecological characteristics walnut (Juglans regia) seedlings under stress. A pot experiment was conducted using J. regia with controlled supplies at different levels (light, moderate, severe control) or without Bacillus cereus L90, a type produces high cytokinins indoleacetic acid (IAA). Under well-watered conditions, there no obvious effect antioxidant enzyme activities, osmotic adjustment levels, photosynthetic regia. As intensity increased, B. increased activities in changed their characteristics. However, substances were decreased as result inoculation. Regardless status, induced significant increase IAA, gibberellins, zeatin contents light abscisic content significantly Additionally, promoted plants terms ground diameter plant height. result, could improve resistance its growth, suggesting it useful supplementary measure use afforestation arid semiarid environments.