Solitary inoculation of bacteria has been studied widely for plant growth development and amelioration of salinity stress but co-inoculation of bacteria for salt stress amelioration in red pepper plants has been less studied till date. Here, we investigated the co-inoculation effect of Pseudomonas frederiksbergensis OB139 and Pseudomonas vancouverensis OB155 in red pepper plant growth characteristics, plant photosynthesis pigments, ethylene emission, and antioxidant properties under 0, 50, 100 and 150 mM salt stress and compared them with non-inoculated control and single inoculation of each isolate. Results showed increasing concentrations of salinity stress arrested the normal plant growth, increased the stress ethylene levels, disrupted the photosynthetic parameters and also influenced the antioxidant enzymatic activities in non-inoculated control plants. Co-inoculation of 1-aminocyclopropane-1-carboxylate (ACC) deaminase producing Pseudomonas spp. significantly reduced the stress ethylene emission and contributed to a significant increase in plant growth compared to single inoculation and non-inoculated control. Catalase activity which was significantly increased in co-inoculated red pepper plants compared to other treatments imply its ability to efficiently neutralize the hydrogen peroxide ions formed as a result of oxidative stress in plants under salinity stress. Besides, significant reduction in malondialdehyde (MDA) content can be correlated to the increased salt tolerance in co-inoculated red pepper plants. Lastly, the increased content of photosynthetic pigments suggest the importance of co-inoculation in improving photosynthesis of red pepper plants. Together, the data demonstrated the functional compatibility of the ACC deaminase producing bacterial isolates and their role in improving the plant physical and biochemical characteristics under salinity stress.

细菌的单独接种已被广泛研究用于植物生长发育和盐分胁迫的改善，但是迄今为止，对辣椒的盐胁迫改善中细菌的共接种的研究还很少。在这里，我们研究了弗氏假单胞菌OB139和温哥华假单胞菌的共接种效果OB155在0、50、100和150 mM盐胁迫下的红辣椒植物生长特性，植物光合作用色素，乙烯释放和抗氧化特性，并将它们与未接种对照和单个接种的每个菌株进行比较。结果表明，盐浓度胁迫的浓度增加阻止了正常植物的生长，增加了胁迫乙烯的水平，破坏了光合参数，还影响了未接种对照植物的抗氧化酶活性。1-氨基环丙烷-1-羧酸（ACC）脱氨酶的共接种产生假单胞菌spp。与单次接种和未接种的对照相比，可显着降低胁迫下的乙烯排放并显着提高了植物的生长。与其他处理方法相比，在共接种的红辣椒植物中过氧化氢酶活性显着提高，这表明其能够有效中和由于盐分胁迫下植物的氧化胁迫而形成的过氧化氢离子的能力。此外，丙二醛（MDA）含量的显着降低可能与共同接种的红辣椒植物的耐盐性提高有关。最后，光合色素含量的增加表明共接种对改善红辣椒植物光合作用的重要性。一起，