Isolation of Bacillus aryabhattai GW320 from the Cucumber Rhizospheric Soil and Evaluation of Plant Growth Promoting Activity

Currently, as part of eco-friendly agriculture in Korea, useful agricultural microorganisms are provided tofarmers through 141 agricultural technology centers nationwide. In particular, there are very few cities andcounties agricultural technology centers are using indigenous and patented microorganisms. Thus, this studywas aimed to isolate Bacillus aryabhattai GW320 from soil rhizosphere of cucumber cultivation and toestimate the effect on the growth promoting effect of cucumbers. As a result, the GW320 strain showed robustplant growth-promoting rhizobacteria (PGPR) activities such as plant growth promoting hormone, nitrogenutilizing activity, and urea solubilizing activities. Furthermore, in comparison with control group, the strainincreased plant height 22 to 33% and leaf width by 7 to 9% in cucumber, and elevated plant inorganiccomponents. In addition, when the results of cucumber growth promotion, plant inorganic components, and soil properties were analyzed, the optimum microbial treatment concentration the isolate GW320 was found to be the best when thestock solution was diluted 100 times, and 1.0 × 107CFU mL-1. Concluding remark of this study is that this indigenous strain isolatedfrom rhizosphere of cucumber in Gunwi-gun promoted growth of cucumber, suggesting the importance of indigenous bacterial strainscientifically confirmed in terms of eco-friendly treatment in agricultural field. KCI Citation Count: 0