• Asian Journal of Turfgrass Science
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• v.26 no.1
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• pp.8-16
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• 2012

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.

• Korean Journal of Agricultural Science
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• v.16 no.1
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• pp.44-55
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• 1989

Out of 826 isolates of Streptomyces isolated from different soils, 65 isolates were selected and identified according to their morphological and physiological characters. A total of 46 species of Streptomyces were identified, and the following 38 species were newly recorded in Korea. 1) Melanoid pigments producing group; S. lavendulae, S. purpurascens, S. violarus, S. lateritius, S. olivochromogenes, S. purpeofuscus, S. fulvoviolaceus, S. gallilaeus, S. naganishii, S. hygroscopicus subsp. ossamyceticus, S. nevagawaensis, S. anandii, S. phaeopurpureus, S. mirabilis, S. arenae, S. massasporeus, S. eurythermus, S. tuirus. 2) Melanoid pigments non-producing group; S. fellus, S. flavidovirens, S. exfoliatus, S. fumanus, S. termitum, S. glomeroaurantiacus, S. luteofluorescens, S. prunicolor, S. fradiae, S. tauricus, S. griseolus, S. misakiensis, S. poonensis, S. antimycoticus, S. diastaticus subsp. ardesiacus, S. nigrifaciens, S. tendae, S. narbonensis subsp. josamvceticus, S. atroolivaceus, S. chrysomallus subsp. fumigatus.