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http://dx.doi.org/10.5338/KJEA.2002.21.3.216

Mutant Induction of Several Antifungal Bacteria by Gamma Radiation (60Co)  

Chung, Hye-Young (Radioisotop e.Radiation Application Team, Korea Atomic Energy Research Institute)
Kim, Jae-Sung (Radioisotop e.Radiation Application Team, Korea Atomic Energy Research Institute)
Cho, Kyu Seong (Radioisotop e.Radiation Application Team, Korea Atomic Energy Research Institute)
Lee, Young-Bok (Department of Horticulture, Chungnam National University)
Lee, Young-Keun (Radioisotop e.Radiation Application Team, Korea Atomic Energy Research Institute)
Publication Information
Korean Journal of Environmental Agriculture / v.21, no.3, 2002 , pp. 216-222 More about this Journal
Abstract
In order to evaluate the antifungal activity of bacteria against plant pathogenic fungi, 8 bacteria were isolated from mushroom compost hot spring, seaweed, and forest soil and mutants from them were induced by $LD_{95}$ gamma radiation($^{60}Co$). Bacillus circulans K1, Burkholderia gladioli K4 and Bacillus subtilis YS1 showed wide antifungal spectrum against 12 kinds of plant pathogenic fungi. From the radiation sensitivity test, B. gladioli K4 was very sensitive to gamma radiation and its $D_{10}$ value was 0.11 kGy. Antifungal activities of B. circulans Kl-1004 and B. subtilis YS1-1009, which were induced by the radiation of $^{60}Co$ increased against Botryosphaeria dothidea. The mutant strains, B. subtilis YS1-1006 and B. subtilis YS1-1009 were resistant to tebuconazole and copper hydroxide. SAR535, SAR5108, and SAR5118 mutated from Streptomyces sp. SAR01 were antifungal activity deficient mutants against 5 kinds of plant pathogenic fungi compared to wild strain, so that they could be supposed to be model strains far studying antifungal mechanism. It is suggested that various functional types of mutants could be induced by gamma radiation and applied usefully.
Keywords
antifungal activity; bacteria; gamma radiation; mutant;
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