Characterization of Bacillus velezensis DCJ 2 isolated from the rhizosphere soil of Aglaonema ‘Maria’ and investigation of its plant growth-promoting effects
DOI:
https://doi.org/10.34117/bjdv10n5-038Keywords:
Aglaonema ‘Maria’, PGPR, Bacillus velezensis DCJ 2, pot experiment, soil drench, foliar sprayAbstract
Aglaonema ‘Maria’ is one of the key foliage plants that has gained high demand in foreign destinations in the last few years. This study was conducted to characterize Bacillus velezensis DCJ 2, assess its plant growth promotion effect and investigate the effectiveness of different delivery methods of the bacterial inoculum for the growth promotion of Aglaonema ‘Maria’. In this context, DCJ 2, isolated from the rhizosphere soil of A. Maria was screened to investigate its potential as a plant growth-promoting bacterium. The pure culture of DCJ 2 maintained on nutrient agar was utilized for morphological, biochemical and physiological examinations. The molecular characterization of the strain was performed with different primer pairs targeting 16SrRNA, gyrA, pgsB and sugar kinase genes of DCJ 2. A pot experiment was carried out to investigate the plant growth promotion effect. It was conducted in the greenhouse as per the complete randomized block design with eight treatments and five replicates. . Healthy plants of A. ‘Maria’ established in field soil and solarized soil were treated with 100 ml of the suspension of the DCJ 2 at the rate of 10 8 CFU/ml either as a soil drench or foliar spray. The partial 16SrRNA, gyrA, pgsB and sugar kinase gene sequences of DCJ 2, BLAST searched in the NCBI database revealed that it has a high similarity to Bacillus velezensis. The pot experiment showed that the application of strain DCJ 2 as a soil drench to solarized soil (Treatment 6) yielded a significant increase in growth parameters at p=0.05. Based on molecular analysis, morphological, biochemical, and physiological reactions, DCJ 2 was identified as Bacillus velezensis. This study revealed that B. velezensis DCJ 2 has the potential to boost the growth of A. Maria and hence serve as a base for developing a biofertilizer.
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