Tarbiat Modares University Journal of Crop Protection 2251-9041 9 1 2020 03 01 Effect of some Pseudomonas fluorescens and Bacillus subtilis strains on osmolytes and antioxidants of cucumber under salinity stress 1 16 1455 10.48311/jcp.2020.1455 EN Roohallah Saberi-Riseh Department of Plant Protection, Faculty of Agriculture, Vali-e-Asr University of Rafsanjan, Iran. Fariba Fathi Department of Plant Protection, Faculty of Agriculture, Vali-e-Asr University of Rafsanjan, Iran. Mojtaba Moradzadeh-Eskandari Department of Plant Protection Research, Khorasan Razavi Agricultural and Natural Resources Research and Education Center, AREEO, Mashhad, Iran. Journal Article One critical environmental stress that limits plant production and development is salinity stress. Recently it has been shown that application of plant growth-promoting rhizobacteria (PGPR) can alleviate the deleterious effects of environmental stresses. Present study aimed to evaluate the effects of some bacterial strains on proline, sugar, total phenolic compounds (TPC), Phenylalanine ammonia lyase (PAL), photosynthetic pigments and antioxidant activities (guaiacol peroxidase, polyphenol oxidase and superoxide dismutase) of cucumber plants under salinity stress. A completely randomized design was applied with a factorial arrangement of two factors: salinity at three levels (0, 50 and 100 mM) and Pseudomonas fluorescens and Bacillus subtilis strains, with three replications. The results showed that cucumber plants that were inoculated with Pseudomonas and Bacillus strains possessed noticeable variations in proline, sugar, TPC, PAL and enzymes activity compared to un-inoculated control. These results suggest that use of these bacterial strains overcame harmful effect of salinity by accumulation of proline, TPC, sugar, PAL activity and enzymes activity that can be considered as a suitable method to manage salinity stress.

https://jcp.modares.ac.ir/article_1455_0a1bf96b7165e962e90cb14648c9462d.pdf