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Identification and Characterization of an Endophytic Strain of Streptomyces from Rice Roots (Orysa sativa L.)  

Kim, Jae-Heon (Department of Microbiology, Dankook University)
Lee, Jun-Kwan (Department of Microbiology, Dankook University)
Publication Information
Korean Journal of Microbiology / v.47, no.4, 2011 , pp. 375-380 More about this Journal
Abstract
We isolated an endophytic actionmycete from root tissues of rice plant collected from paddy field near Dankook University, Cheonan, Korea. Surface sterilized roots were laid on the selective agar plates and incubated. The powdery actinomycete colonies appeared on the root surface after four weeks incubation. We isolated a strain JK-5 among them and could determine its taxonomical position as Streptomyces diastaticus subsp. ardesiacus by using 16S ribosomal DNA sequencing. The chemotaxonomical and morphological studies confirmed the taxonomical position of the strain JK-5. The shape of aerial hyphae was flexible and they contained spore chains with more than 30 smooth spherical spores per chain. Cell walls contained LL-diaminopimelic acid. There was no characteristic sugar in whole-cell hydrolysates. The major fatty acids were anteiso-15:0, anteiso-17:0 and iso-16:0. The specific menaquinones, MK-9 ($H_6$), MK-9 ($H_8$), were detected. The GC content was 72%. Antifungal activities of the strain JK-5 were relatively strong against fungal plant pathogens. The endophytic growth of the strain JK-5 was confirmed by SEM observation of the root and stem of the infected rice plant.
Keywords
antifungal activity; endophyte; rice plant; root; streptomycete;
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