Dao Thi Luong

Vietnam National University, Hanoi, Hà Nội, Ha Nội, Vietnam

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Publications (4)5.79 Total impact

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    ABSTRACT: Strain VN07A0015(T) was isolated from soil collected on Cat Ba Island, Vietnam. The taxonomic position of strain VN07A0015(T) was near Streptomyces aomiensis (98.5% similarity) and Streptomyces scabrisporus (95.6%), and it clustered within them; however, this cluster was distant from the type strains of other Streptomyces species. The aerial mycelia of strain VN07A0015(T) were greyish and formed imperfect spiral spore chains (retinaculiaperti type) with smooth-surfaced spores. The morphological features of strain VN07A0015(T) were different from those of S. aomiensis and S. scabrisporus. The chemotaxonomic characteristics of strain VN07A0015(T) were typical for all members of the genus Streptomyces, which possessed LL-type diaminopimelic acid, menaquinone MK-9(H6, H8), and the major fatty acids iso-C16:0 and iso-C15:0. The result of DNA relatedness between strain VN07A0015(T) and S. aomiensis NBRC 106164(T) was less than 30%. In addition, some physiological and biochemical traits differed from those of S. aomiensis. Therefore, we propose that strain VN07A0015(T) be classified in the genus Streptomyces as a representative of Streptomyces catbensis sp. nov. (Type strain VN07A0015(T) = VTCC-A-1889(T) = NBRC 107860(T)).
    INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY 04/2014; · 2.11 Impact Factor
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    ABSTRACT: Actinomycetes were isolated from 109 soil and 93 leaf-litter samples collected at five sites in Vietnam between 2005 and 2008 using the rehydration-centrifugation (RC) method, sodium dodecyl sulfate-yeast extract dilution method, dry-heating method and oil-separation method in conjunction with humic acid-vitamin agar as an isolation medium. A total of 1882 strains were identified as Vietnamese (VN)-actinomycetes including 1080 (57%) streptomycetes (the genus Streptomyces isolates) and 802 (43%) non-streptomycetes. The 16S ribosomal RNA gene sequences of the VN-actinomycetes were analyzed using BLAST searches. The results showed that these isolates belonged to 53 genera distributed among 21 families. Approximately 90% of these strains were members of three families: Streptomycetaceae (1087 strains, 58%); Micromonosporaceae (516 strains, 27%); and Streptosporangiaceae (89 strains, 5%). Motile actinomycetes of the genera Actinoplanes, Kineosporia and Cryptosporangium, which have quite common morphological characteristics, were frequently isolated from leaf-litter samples using the RC method. It is possible that these three genera acquired common properties during a process of convergent evolution. By contrast, strains belonging to the suborder Streptosporangineae were exclusively isolated from soils. A comparison of the sampling sites revealed no significant difference in taxonomic diversity between these sites. Among the non-streptomycetes, 156 strains (19%) were considered as new taxa distributed into 21 genera belonging to 12 families. Interestingly, the isolation of actinomycetes from leaf-litter samples using the RC method proved to be the most efficient way to isolate new actinomycetes in Vietnam, especially the Micromonosporaceae species.Keywords: actinomycete ecology; taxonomic diversity; Vietnamese actinomycetes
    The Journal of Antibiotics 05/2011; 64(9):599-606. · 2.19 Impact Factor
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    ABSTRACT: VY-68, a ballistoconidiogenous yeast strain, isolated from a plant leaf at Cuc Phuong National Park of Ninh Binh Province, Vietnam, was assigned to the genus Bullera based on morphological and chemotaxonomical characteristics. Based on the sequence analyses of 18S rDNA, D1/D2 region of 26S rDNA, and internal transcribed spacer regions (ITS), VY-68 was phylogenetically closely related to Bullera pseudoalba and Cryptococcus cellulolyticus. DNA-DNA reassociation experiments among VY-68, B. pseudoalba and C. cellulolyticus revealed that strain VY-68 is a distinct species, and the latter two are conspecific. Bullera hoabinhensis is proposed for VY-68.
    The Journal of General and Applied Microbiology 01/2006; 51(6):335-42. · 0.74 Impact Factor
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    ABSTRACT: Five ballistoconidiogenous yeast strains, isolated from plant leaves at Cuc Phuong National Forest of Ninh Binh, Vietnam, were assigned to the genus Kockovaella based on morphological and chemotaxonomical characteristics. They represent four new species based on analyses of 18S rDNA sequence, sequences of internal transcribed spacer regions, and DNA-DNA reassociation experiments. Four new species, Kockovaella calophylli (1 strain), Kockovaella cucphuongensis (2 strains), Kockovaella litseae (1 strain), and Kockovaella vietnamensis (1 strain) are proposed for these strains.
    The Journal of General and Applied Microbiology 01/2001; 46(6):297-310. · 0.74 Impact Factor