The effect of plant growth promoting rhizobacteria (PGPR) and arbuscular mycorrhizal fungi (AMF) inoculation on nutrient uptake and some morphological factors in peppermint (Mentha piperita)

Plant growth promoting rhizobacteria and arbuscular mycorrhizal fungi can inhanced plant growth by increasing nutrient uptake. In order to investigate the effect of PGPR and AMF on some morphological parameters, macro (nitrogen, phosphorus, potassium, calcium and magnesium) and micro (iron, zinc and copper) nutrients uptake, percentage of root colonization and some morphological factors of peppermint, an experiment was conducted as complete randomized design with nine replications. The treatments consisted of three species of AMF (Glomus fasciculatum, Glomus intraradices and Glomus mosseae) and three bacterial species treatment as PGPR (Azotobacter, Bacillus and group of Fluorescens Pseudomonas contain of Pseudomonas aeruginosa, Pseudomonas fluorescens, Pseudomonas putida) and control (non bacterial-mycorrhizal). Results showed that the application of PGPR and AMF had significant effect (P≤0/05) on root and shoot dry weight and nutrients uptake in compared to control. Maximum uptake of nitrogen (140 mg pot-1) was obtained at Azotobacter, while Maximum uptake of phosphorus, potassium and magnesium uptake (54.1, 731 and 280 mg pot-1, respectively) were observed at Pseudomonas treatment. The highest values of calcium, iron, zinc and copper uptake (418, 0.177, 0.048 and 0.050 mg pot-1, respectively) were achieved at Glomus fasciculatum treatment. Based on the experimental results, it is concluded that the using of PGPR and AMF can useful role in improving the absorption of nutrients and morphological parameters in peppermint.