N P Singh, R K Singh, V S Meena and R K Meena
Can we use Maize (Zea mays) Rhizobacteria as Plant Growth Promoter ?
Plant Growth Promoting Rhizobacteria (PGPR) is a group of bacteria that has the ability to enhance plant growth and yield via various plant growth promoting substances as well as biofertilizers. Ten bacterial isolates screened from rhizosphere of maize growing at Indo-Gangetic plain of eastern Uttar Pradesh, India showed potential nutrients solubilization and plant growth promoting activities. Rhizobacterial were able to produce phytohormone auxin (IAA) in the tryptophan supplemented medium which showed maximum production by strain BHU8. Phosphate solubilization activity was highly observed in isolate BHU8 followed by BHU3, BHU9 and BHU10. Plant cell wall hydrolyzing enzymes (Cellulase and Pectinase) were expressed in BHU3, BHU8, BHU9 and BHU10 and among ten rhizobacterial strains only six strains (BHU1, BHU2, BHU3, BHU5, BHU8 and BHU10) produced siderophore. Based on 16S rDNA gene sequence strains BHU1, BHU2, BHU3, BHU8, BHU10 showed 99.6%, 99.8%, 99.8%, 99.7% and 99.9% sequence alignment respectively with seudomonas brassicacearum, Pseudomonas taiwanensis Pseudomonas aeruginosa, Pseudomonas saponiphila and Pseudomonas oryzihabitans, respectively whereas strains BHU4 and BHU5 showed 99.7% similarity with Rhizobium radiobacter and strains BHU6 and BHU9 showed 99.9% sequence aligned with Bacillus oceanisediminis and Bacillus flexus, respectively. Strain BHU7 exhibited 99.9% similarity with Enterobacter asburiae
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