Paenibacillus Polymyxa MVY-024: Plant Growth Promoting Bacteria Which is Easy to Apply on an Industrial Scale

Abstract

In this study, thirteen isolates which were possibly expected to fix nitrogen, were isolated from the soil and pea root nodules and identified by gene analysis of 16S rDNA sequences. Two of these isolates which were able to form endospores and growth on nitrogen free media were selected for spring wheat development research. The isolate Paenibacillus sp. S7 identified as Paenibacillus polymyxa was found to significantly increased amount of ammonium and mineral N amounts in the soil. Furthermore, increased nitrogen accumulation in grain and a chlorophyll index were obtained after wheat treatment. Paenibacillus sp. S7 isolate was selected for further studies and accession number MT900581 and strain name MVY-024 in NCBI nucleotide bank for this isolate was assigned. During cultivation of Paenibacillus sp. MVY-024, sugarcane molasses and yeast extract were determined as the most suitable carbon and nitrogen sources, optimal concentrations were 100 gL-1 and 10 gL-1, respectively. The optimal pH range for cells culturing was between 6.5 and 7.0, optimal air flow rate was 0.4 vvm. It was found that air flow has effect for biomass production and cells endospores formation. After Paenibacillus sp. MVY-024 biomass cultivation optimization, cultured cells number was on average 2.2 × 109 cfu mL-1.