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임정아,이동완,Sunggi Heu 한국식물병리학회 2015 Plant Pathology Journal Vol.31 No.1
In order to control Pectobacterium carotovorum subsp. carotovorum, a novel virulent bacteriophage PM2 wasisolated. Bacteriophage PM2 can infect 48% of P. carotovorumsubsp. carotovorum and 78% of P. carotovorumsubsp. brasilliensis but none of atrosepticum, betavasculorum,odoriferum and wasabiae isolates had beeninfected with PM2. PM2 phage belongs to the familyMyoviridae, and contains a large head and contractiletail. It has a 170,286 base pair genome that encodes291 open reading frames (ORFs) and 12 tRNAs. MostORFs in bacteriophage PM2 share a high level of homologywith T4-like phages including IME08, RB69,and JS98. Phylogenetic analysis based on the aminoacid sequence of terminase large subunits confirmedthat PM2 is classified as a T4-like phage. It contains nointegrase- or no repressor-coding genes related to thelysogenic cycle, and lifestyle prediction using PHACTsoftware suggested that PM2 is a virulent bacteriophage.
Eunjung Roh,Sunggi Heu,Eunpyo Moon 한국미생물학회 2008 The journal of microbiology Vol.46 No.6
Xanthomonas axonopodis pv. glycines produces bacteriocins called glycinecin, and two glycinecin genes, glyA and glyR, were reported previously. In this paper, we describe genomic distribution and variation of the glyR gene revealed by extensive Southern hybridization analysis. In contrast to the glyA gene present only in X. axonopodis pv. glycines, the glyR gene was found to be distributed widely in all the pathovars of Xanthomas genus. It was also found that the glyR gene is a multigene family while the glyA is a single copy gene. Moreover, the copy number and the variation of the glyR multigene are unique to each pathovar of Xanthomonas. The uniqueness can be easily detected by the patterns resulted from Southern hybridization using the genomic digests. Thus, we suggest the glyR gene can serve as a useful genus-specific and pathovarspecific DNA marker for Xanthomonas. One of the glyR homologs was further isolated from X. axonopodis pv. glycines, and analyzed to be functional with strong inhibitory activity against several members of Xanthomonas.
Choi, Min-Seon,Heu, Sunggi,Paek, Nam-Chon,Koh, Hee-Jong,Lee, Jung-Sook,Oh, Chang-Sik The Korean Society of Plant Pathology 2012 Plant Pathology Journal Vol.28 No.4
Xanthomonas oryzae pv. oryzae causing bacterial leaf blight disease in rice produces and secretes Hpa1 protein that belongs to harpin protein family. Previously it was reported that Hpa1 induced defense responses when it was produced in tobacco. In this study, we expressed hpa1 gene in rice and Arabidopsis to examine the effects of Hpa1 expression on disease resistance to both fungal and bacterial pathogens. Expression of hpa1 gene in rice enhanced disease resistance to both X. oryzae pv. oryzae and Magnaporthe grisea. Interestingly, individual transgenic rice plants could be divided into four groups, depending on responses to both pathogens. hpa1 expression in Arabidopsis also enhanced disease resistance to both Botrytis cineria and Xanthomonas campestris pv. campestris. To examine genes that are up-regulated in the transgenic rice plants after inoculation with X. oryzae pv. oryzae, known defense-related genes were assessed, and also microarray analysis with the Rice 5 K DNA chip was performed. Interestingly, expression of OsACS1 gene, which was found as the gene that showed the highest induction, was induced earlier and stronger than that in the wild type plant. These results indicate that hpa1 expression in the diverse plant species, including monocot and dicot, can enhance disease resistance to both fungal and bacterial plant pathogens.
Lim, Jeong-A,Heu, Sunggi,Park, Jinwoo,Roh, Eunjung Springer-Verlag 2017 Archives of virology Vol. No.
<P>Bacteriophage vB_PcaP_PP2 (PP2) is a novel virulent phage that infects the plant-pathogenic bacterium <I>Pectobacterium carotovorum</I> subsp. <I>carotovorum</I>. PP2 phage has a 41,841-bp double-stranded DNA encoding 47 proteins, and it was identified as a member of the family <I>Podoviridae</I> by transmission electron microscopy. Nineteen of its open reading frames (ORFs) show homology to functional proteins, and 28 ORFs have been characterized as hypothetical proteins. PP2 phage is homologous to <I>Cronobacter</I> phage vB_CskP_GAP227 and Dev-CD-23823. Based on phylogenetic analysis, PP2 and its homologous bacteriophages form a new group within the subfamily <I>Autographivirinae</I> in the family <I>Podoviridae</I>, suggesting the need to establish a new genus. No lysogenic-cycle-related genes or bacterial toxins were identified.</P><P><B>Electronic supplementary material</B></P><P>The online version of this article (doi:10.1007/s00705-017-3349-6) contains supplementary material, which is available to authorized users.</P>
배영민,Na-Young Choi,Sunggi Heu,Dong-Hyun Kang,이선영 한국응용생명화학회 2011 Applied Biological Chemistry (Appl Biol Chem) Vol.54 No.6
Inhibitory effects of organic acids combined with modified atmosphere packaging (MAP) on foodborne pathogens, including Escherichia coli O157:H7, Salmonella Typhimurium, and Listeria monocytogenes, on cabbage were evaluated. The cabbage samples were inoculated with cocktails containing each of the three stains, treated with three different organic acids (acetic, lactic, and malic acids) for 10 min at room temperature, and then dried. Populations of E. coli O157:H7, S. Typhimurium, and L. monocytogenes on cabbage were significantly reduced by treatment with 2% acetic, 1% lactic, and 2% malic acids, and their reduction levels were 1.9, 3.3, and 2.6 log10 CFU/g, respectively. Cabbage samples were packaged using four different methods (air, vacuum, N2 gas, and CO2 gas) following treatment with distilled water or 2% lactic acid for 10 min at room temperature and then stored at 10oC. Initial populations of E. coli O157:H7, S. Typhimurium, and L. monocytogenes on cabbage were approximately 6.2, 6.7, and 5.1 log10 CFU/g, respectively, and treatment with 2% lactic acid for 10 min reduced the three pathogens by 3.1, 3.3, and 2.4 log10 CFU/g, respectively. As a result, inhibitory effects of the pathogens were significantly reduced by 2% lactic acid than when using distilled water. MAP was effective in maintaining reduced levels of pathogens during storage following the treatments. However, no significant differences in the levels of pathogens were observed among the samples packaged under four different gas conditions.
Genetic Mapping of Novel Symptom in Response to Soybean Bacterial Leaf Pustule in PI 96188
이석하,김길현,박종호,김문영,Sunggi Heu 한국작물학회 2011 Journal of crop science and biotechnology Vol.14 No.2
Soybean bacterial leaf pustule (BLP) is a serious disease caused by Xanthomonas axonopodis pv. glycines. Typical symptoms of BLP are pustules surrounded by small yellow haloes. Interestingly, PI 96188 only exhibits pustules without chlorotic haloes which suggests a resistant response. The objectives of this study are to understand the inheritance mode of the novel symptom to BLP in PI 96188 and to investigate whether or not a gene controlling BLP resistance in PI 96188 is identical to the rxp gene. First, a new BLP resistant genotype, PI 96188 was crossed with the resistant cultivar SS2-2. All F₁ plants showed the same phenotype as SS2-2 and the F₂ population segregated into 75 typical symptoms (haloes presence : 28 novel symptoms (haloes absence) indicating the presence of a single recessive gene. To map the novel symptom to BLP in PI 96188, a population of 88 F_7 recombinant inbred lines was developed from a cross between PI 96188 and the susceptible cultivar Jinjoo1. The BLP resistance gene from PI 96188 was mapped on chromosome (Chr.) 10 (LG O) rather than Chr. 17 (LG D2). This gene was linked with the simple sequence repeat marker, Sat_108at the distal end of Chr. 10. Thus, the BLP resistance gene from PI 96188 was determined to be a new gene.