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Microorganisms are of great importance in agriculture in terms of plant nutrients by reducing the need for chemical fertilization. In recent years, plant growth-promoting bacteria (PGPB) have been widely used as biological fertilizers (BF) in agriculture. This study was conducted to determine the effect of plant growth-promoting bacteria on the development of pea plants. Firstly the phosphate solubilization and nitrogen fixation potentials of the bacteria used in this study were determined. In the study, the effects of 4 different combinations, F1 [(Rhizobium sp. (FR-13) and Pseudomonas alcaligenes (FDG121)], F2 [(Pseudomonas fluorescens biotype F (FDG-7), Rhizobium sp. (FR-18) and Bacillus-megaterium-GC subgroup B(FDG-134)], F3 [Arthrobacter oxydans (FDG-72), Bacillus-megaterium-GC subgroup B (FDG-146), Rhizobium sp. (FR-11)] and F4 [Acinetobacter genospecies 9 (FDG-116), Brevibacillus agri (FDG-118), Methylobacterium zatmanii (FDG-123) and Bacillus-megaterium-GC subgroup A (FDG-153)] were investigated. Formulations made with bacteria that were found to be the best in terms of the properties specified among these strains were tested against pea plants under greenhouse conditions and their effects on the plant's total fresh and dry weight were investigated. The study was set up to have 3 replications. As a result of the statistical analysis made with the data obtained, the formulations used compared to the control; F2, F3 and F1 applications were important in total fresh weight, respectively, and F2 and F3 applications were important in total dry weight. As a result, these 3 formulations are especially effective on the yield of pea plants and can be used as potential biofertilizers. [ABSTRACT FROM AUTHOR]

This study aimed to determine the essential oil content, essential oil and extracts, which are known as Ferula orientalis and obtained from naturally grown plants in Narman (Erzurum, Türkiye) province, antioxidant effects and antimicrobial effects. F. orientalis essential oils were isolated by hydrodistillation and analyzed using gas chromatography-mass spectrometry to identify their components. The antimicrobial activity was measured by the disc diffusion methods and minimal inhibitory concentration (MIC) methods against Chryseobacterium indologenes which cause soft rot in certain vegetables and fruits. Total antioxidant and phenolic contents were analyzed by 2,2′-diphenyl-1-picrylhydrazyl (DPPH) free radical-scavenging, 2,2'-azino-bis(3-ethylbenzothiazoline-6 sulphonic acid (ABTS), thiobarbituric acid reactive species (TBARS), β-carotene bleaching test (BCB) and Folin-Ciocalteu method. According to the results obtained; F. orientalis essential oil exhibited a high content of δ-3-Carene (40.38%) as major compound over 14 identified components by GC-MS analysis followed by γ-Terpinene (17.24%), (E)-β-Ocimene (10.51%), and β-Phellandrene (8.49%). The essential oil and extracts was evaluated for its antimicrobial activity against C. indologenes showed significant antibacterial activities with MIC values of 9-21 mm and 62.5 μg/mL, respectively, but extracts and antibiotics have no effect against C. indologenes. Hexane extract had the highest ABTS free radical scavenging activity with 14.2 (IC50 g/l), acetone extract had the highest DPPH capacity with 24.2 (IC50 g/l), and water extract had the highest amount of total phenolic compound with 15.13±3.82 mg GAE/g. In the TBARS test antioxidant activity increased as the amount of essential oil increased. The antioxidant capacity of F. orientalis essential oil exhibited reduction when evaluated by β-carotene bleaching assay. As a result, it is thought that F. orientalis essential oils and extracts can be used as an alternative natural antioxidant source for potential applications. [ABSTRACT FROM AUTHOR]

Background: Salinity is one of the environmental stress factors that restrict the crop production by endangering agricultural areas. Nitric oxide (NO) protects plants from damage caused by oxidative stress conditions in various biological ways. Methods: In this greenhouse investigation during 2018, pea plants were irrigated with three levels of NaCl (0, 50 and 100 mM) solutions. NO solutions were prepared with three different doses (0, 75 and 100 µM SNP). These solutions were applied to the seeds before sowing and then to the leaves of the pea cultivars. The study was conducted to analyze the impact of NO on growth, malondialdehyde (MDA), hydrogen peroxide (H2O2 ), antioxidant enzyme activity and nutrient uptake in two pea cultivars under salinity conditions. Result: Salinity reduced fresh-dry weight, relative water content (RWC) and chlorophyll a and b content of pea. However, NO enhanced these parameters under salt stress. Salinity increased tissue electrical conductance (TEC), H2O2 and MDA content, which were decreased by combined application of NaCl and NO. Salinity caused an increase in antioxidant enzyme activity in pea, and NO made a significant improvement in their activities under salinity conditions. Salinity treatments decreased the ratio of K+ /Na+ and Ca2+/Na+ in both cultivars and application of NO elevated them as compared to the control under salt stress. In conclude, exogenous NO treatment could help pea to tolerate salinity stress by increasing the chlorophyll content and regulating antioxidant enzyme activity and nutrient uptake. [ABSTRACT FROM AUTHOR]