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Islam, Md. Rezuanul,Jeong, Yong-Tae,Lee, Yong-Se,Song, Chi-Hyun The Korean Society of Mycology 2012 Mycobiology Vol.40 No.1
Antagonistic microorganisms against $Rhizoctonia$ $solani$ were isolated and their antifungal activities were investigated. Two hundred sixteen bacterial isolates were isolated from various soil samples and 19 isolates were found to antagonize the selected plant pathogenic fungi with varying degrees. Among them, isolate C9 was selected as an antagonistic microorganism with potential for use in further studies. Treatment with the selected isolate C9 resulted in significantly reduced incidence of stem-segment colonization by $R.$ $solani$ AG2-2(IV) in Zoysia grass and enhanced growth of grass. Through its biochemical, physiological, and 16S rDNA characteristics, the selected bacterium was identified as $Bacillus$ $subtilis$ subsp. $subtilis$. Mannitol (1%) and soytone (1%) were found to be the best carbon and nitrogen sources, respectively, for use in antibiotic production. An antibiotic compound, designated as DG4, was separated and purified from ethyl acetate extract of the culture broth of isolate C9. On the basis of spectral data, including proton nuclear magneric resonance ($^1H$ NMR), carbon nuclear magneric resonance ($^{13}C$ NMR), and mass analyses, its chemical structure was established as a stereoisomer of acetylbutanediol. Application of the ethyl acetate extract of isolate C9 to several plant pathogens resulted in dose-dependent inhibition. Treatment with the purified compound (an isomer of acetylbuanediol) resulted in significantly inhibited growth of tested pathogens. The cell free culture supernatant of isolate C9 showed a chitinase effect on chitin medium. Results from the present study demonstrated the significant potential of the purified compound from isolate C9 for use as a biocontrol agent as well as a plant growth promoter with the ability to trigger induced systemic resistance of plants.
Islam, Rezuanul,Khan, Rejaul Islam,Al-Reza, Sharif M,Jeong, Yong Tae,Song, Chi Hyun,Khalequzzaman, M John Wiley Sons, Ltd. 2009 Journal of the Science of Food and Agriculture Vol.89 No.7
<P>BACKGROUND: Cinnamomum aromaticum is a widely used cooking ingredient in South Asian countries. In this study the essential oil of C. aromaticum was tested against the stored product beetle Callosobruchus maculatus. The objective was to identify the natural compounds with insecticidal properties in the essential oil of C. aromaticum with a view to its potential use as an alternative to synthetic pesticides.</P><P>RESULTS: The chemical composition of the hydrodistilled bark essential oil of C. aromaticum was analysed by gas chromatography/mass spectrometry, and cis-cinnamaldehyde (53.90%) was found to be the principal constituent. The surface film and fumigation toxicities and repellency activity against C. maculatus were evaluated. The extracted oil showed 94.44% mortality against adult C. maculatus through the surface film bioassay. The LD<SUB>50</SUB> values were 27.56 and 23.16 µg cm<SUP>−2</SUP> after 24 and 48 h of exposure respectively. The regression equations were calculated as Y = 0.39 + 3.20X and Y = 1.25 + 2.75X respectively. In the fumigation bioassay the LD<SUB>50</SUB> value was 434.69 µg cm<SUP>−2</SUP> after 24 h of exposure, with the regression equation Y = 0.87 + 1.57X. It was also found that the extracted oil contained compounds that had a dose-dependent protective effect on egg hatching and adult emergence.</P><P>CONCLUSION: The results obtained from this study suggest that the toxicity and insecticidal activity of C. aromaticum are attributable to its essential oil, which could be used as a biodegradable and natural bioprotectant for controlling stored product pests. Copyright © 2009 Society of Chemical Industry</P>
송치현,이용세,장태현,Md. Rezuanul Islam 한국잔디학회 2012 Weed & Turfgrass Science Vol.26 No.1
The objective of this study was to identify bacterial antagonists of R. solani AG2-2 (IV) on zoysiagrass and to evaluate their antifungal activity in vitro and in vivo to select an antagonistic isolate. Antagonistic isolates that inhibit large patch disease caused by R. solani AG2-2 (IV) in zoysiagrass were selected from several soils,and their antagonistic activities were investigated in vitro and in vivo. Of 216 bacterial isolates, 67 inhibited several plant pathogenic fungi. The isolates that inhibited stem-segment colonization by R. solani AG2-2 (IV) in zoysiagrass were tested in a growth chamber. Eleven isolates were active as plant growth promoting isolates. Among them, five plant growth promoting isolates and their concentration dependent efficiency on zoysiagrass following inoculation with R. solani AG2-2 (IV) was evaluated. Isolate H33 was one of the potential antagonistic isolates, and it was further tested against various plant pathogens. H33 not only suppressed the disease caused by R. solani AG2-2 (IV) on zoysiagrass but also promoted leaf weight and leaf height of zoysiagrass under growth chamber and greenhouse conditions. The H33 isolate, which belongs to Streptomyces arenae, was identified through physiological, biochemical, and 16S rDNA studies. Further studies will investigate the cultural characterization of S. arenae H33 and isolation and identification of antifungal substance produced by S. arenae H33.
Yong-Tae Jeong,Young-Ah Gu,Rezuanul Islam,Chi-Hyun Song,정상철 한국식품과학회 2010 Food Science and Biotechnology Vol.19 No.2
Antitumor effect of endo-biopolymer (EBP)obtained from submerged mycelial culture of Pleurotus eryngii was investigated by using Sarcoma-180 bearing mice. The administration of EBP, intraperitoneally (10 to 80 mg/kg BW) at all dose ranges, inhibited the growth of the solid tumor and simultaneously increased the activity of natural killer (NK) cells significantly. While, 40 mg/kg BW treated group reduced the tumor formation (53.1%),and increased the NK cell activity of splenocytes (25.0%)to a great extent. The complement activity of the EBP was 43.1% (1,000 μg/mL). Phosphatase activity of macrophage was found to be increased up to 35.3% (100 μg/mL) when compared with control. The chemical composition of EBP was found to contain carbohydrate (77.5%) and protein (21.6%). The major component sugars of EBP were glucose and mannose, while glycine, glutamic acid, and aspartic acid mainly constituted the protein moiety. These results revealed that EBP obtained from submerged culture of P. eryngii stimulate not only immune system but also antitumor activity.
들잔디 갈색퍼짐병의 생물학적 방제를 위한 길항 세균의 분리와 동정
송치헌,장태현,이용세,Song, Chi-Hyun,Islam, Md. Rezuanul,Chang, Tae-Hyun,Lee, Yong-Se Turfgrass Society of Korea 2012 한국잔디학회지 Vol.13 No.2
한국 들잔디에 발생하는 Rhizoctonia solani에 의한 라지패치를 생물학적으로 방제하기위해 일반토양에서 길항미생물을 분리하여 in vitro와 in vivo에서 길항효과 및 병 발생억제효과를 검정하였다. 토양에서 분리한 216개 균주 중 15개 균주가 R. solani AG2-2 (IV)의 균사생장을 70%이상 억제하였으며, 온실실험 결과 11개 균주는 잔디의 생장을 촉진시켰으며, 병 발생 억제효과가 있었다. 분리한 길항미생물 중 H33 균주는 in vitro 및 in vivo에서 R. solani AG2-2 (IV)에 대한 길항효과가 다른 균주에 비해 높았으며, 공시한 17개 식물병원성 진균에 대해 길항효과가 높아 생물방제균으로 선발하였다. H33 균주를 ISP 배지에 배양한 후 배양적 특성 및 형태를 관찰한 결과 Streptomyces sp.로 동정되었으며, 16S rDNA를 분석한 결과 Streptomyces arenae와 99% 상동성을 보였다. The objective of this study was to identify bacterial antagonists of R. solani AG2-2 (IV) on zoysiagrass and to evaluate their antifungal activity in vitro and in vivo to select an antagonistic isolate. Antagonistic isolates that inhibit large patch disease caused by R. solani AG2-2 (IV) in zoysiagrass were selected from several soils, and their antagonistic activities were investigated in vitro and in vivo. Of 216 bacterial isolates, 67 inhibited several plant pathogenic fungi. The isolates that inhibited stem-segment colonization by R. solani AG2-2 (IV) in zoysiagrass were tested in a growth chamber. Eleven isolates were active as plant growth promoting isolates. Among them, five plant growth promoting isolates and their concentration dependent efficiency on zoysiagrass following inoculation with R. solani AG2-2 (IV) was evaluated. Isolate H33 was one of the potential antagonistic isolates, and it was further tested against various plant pathogens. H33 not only suppressed the disease caused by R. solani AG2-2 (IV) on zoysiagrass but also promoted leaf weight and leaf height of zoysiagrass under growth chamber and greenhouse conditions. The H33 isolate, which belongs to Streptomyces arenae, was identified through physiological, biochemical, and 16S rDNA studies. Further studies will investigate the cultural characterization of S. arenae H33 and isolation and identification of antifungal substance produced by S. arenae H33.