摘要 : The effect of inoculation of three plant growth promoting rhizobacteria (PGPR) that is Rhizobium japonicum, Azotobacter chroococcum and Azospirillum brasilense and mixture of them on some physiological attributes of soybean under ... 展开 The effect of inoculation of three plant growth promoting rhizobacteria (PGPR) that is Rhizobium japonicum, Azotobacter chroococcum and Azospirillum brasilense and mixture of them on some physiological attributes of soybean under different irrigation regimes was investigated. Drought stress was induced by irrigation withholding until 40, 80 and 120 mm evaporation from class A evaporation pan. However, seed inoculation of soybean was accompanied with 20 kg/ha nitrogen. In addition, 20 and 100 kg/ha nitrogen was considered as control treatments. The results revealed that drought stress significantly decreased membrane stability, chlorophyll, nitrogen content and relative water content. By contrast proline accumulation was promoted due to drought stress. PGPR application improved membrane stability compared to control treatment. In addition, mixture of PGPRs diminished proline accumulation in plant tissues. The highest chlorophyll content was observed when mixture of PGPRs was applied. It was noted that PGPR application improved nitrogen content in soybean plants. 收起