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KMID : 0613820210310070641
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Journal of Life Science
2021 Volume.31 No. 7 p.641 ~ p.653
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Characterization of Potential Plant Growth-promoting Rhizobacteria as Biological Agents with Antifungal Activity, Plant Growth-promoting Activity, and Mineral Solubilizing Activity
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Lee Song-Min
Kim Ji-Youn
Kim Hee-Sook
Oh Ka-Yoon
Lee Kwang-Hui
Lee Sang-Hyeon
Jang Jeong-Su
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Abstract
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The purpose of this study was to confirm the antifungal activity, plant growth-promoting activity, and mineral solubilizing activity of 18 types of bacteria isolated purely from rhizosphere soil. The potential of isolates of the genus Bacillus and Pseudomonas as biocontrol agents was confirmed through the antifungal activity of these isolates. This activity has been determined to be due to various hydrolytic enzymes on the cell wall of plant pathogenic fungi and the production of siderophores in isolates. In addition, most of the isolates have been found to have aminocyclopropane-1-carboxylate deaminase production activity, indole-3-acetic acid production activity, and nitrogen fixation activity. These characteristics are believed to have a positive effect on root development, growth, and the productivity of crops via a reduction in the concentration of ethylene under conditions of environmental stress, to which plants are commonly exposed. In addition, on testing for the solubilizing activity of the isolates for phosphoric acid, silicon, calcium carbonate, and zinc, some isolates were found to have mineral solubilizing activities. Inoculation of these isolates during plant growth is expected to assist plant growth by converting nutrients necessary for growth into usable forms that can be absorbed by plants. The 18 isolated strains can be used as biocontrol agents due to their antifungal activity, plant growth- promoting activity, and mineral solubilizing activity.
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KEYWORD
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Antifungal activity, biocontrol agent, mineral solubilizing activity, plant growth promoting activity, plant growth promoting rhizobacteria (PGPR)
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