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The plant pathology journal 16건

  1. [국내논문]   Recent researches on Sapstaining Fungi Colonizing Pines  

    Kim, Seong-Hwan (Department of Microbiology and Institute of Basic Science, Dankook University)
    The plant pathology journal v.21 no.1 ,pp. 1 - 6 , 2005 , 1598-2254 ,

    초록

    During last decade there has been noticeable progress in the research of the biology of sapstaining fungi that cause considerable economic losses to forest product industry. The researches generated broad ranges of knowledge on sapstaining fungi regarding their occurrence on conifer wood, taxonomy, nutrient physiology, pigmentation biochemistry and molecular biology, and biological control. Major problematic groups in the sapstain production are Ophiostoma, Ceratocystis, and Leptographium genera. With Ophiostoma as a model, it is found that the type of carbon source is important in the growth and pigment production of sapstaining fungi. The operation of dihydroxy naphthalene (DHN) melanin pathway for black to bluish pigment production has been confirmed in those cosmetic fungi both at biochemical and molecular levels. The development of albino technology using nutrition competition has been shown to be promising as an environmentally friendly biological control method for sapstain control.

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  2. [국내논문]   Invisible Signals from the Underground: Bacterial Volatiles Elicit Plant Growth Promotion and Induce Systemic Resistance   피인용횟수: 1

    Ryu, Choong-Min (Laboratory of Microbial Genomics ) , Farag, Mohammed A. (The Samuel Robert Noble Foundation ) , Pare, Paul. W. (Department of Biochemistry, Texas Tech University ) , Kloepper, Joseph W. (Department of Entomology and Plant Pathology, Auburn University)
    The plant pathology journal v.21 no.1 ,pp. 7 - 12 , 2005 , 1598-2254 ,

    초록

    Plant growth-promoting rhizobacteria (PGPR) are a wide range of root-colonizing bacteria with the capacity to enhance plant growth and control plant pathogens. Here we review recent progress that indicate some PGPR strains release a blend of volatile organic compounds (VOCs) that promote growth in Arabidopsis seedlings and induce resistance against Erwinia carotovora subsp. carotovora. In particular, the volatile components 2,3-butanediol and acetoin released exclusively from the PGPR strains triggered the greatest level of growth promotion and induced systemic resistance. Pharmacological applications of 2,3-butanediol promoted the plant growth and induced resistance, while bacterial mutants blocked in 2,3-butanediol and acetoin synthesis was devoid of growth-promotion and induced resistance capacities. The results suggested that the bacterial VOCs play a critical role in the plant growth promotion and induced resistance by PGPR. Using transgenic and mutant lines of Arabidopsis, we provide evidences that the signal pathway activated by volatiles from one PGPR strain is dependent on cyto-kinin activation for growth promotion and dependent on an ethylene-signaling pathway for induced pathogen resistance. This discovery provides new insight into the role of bacterial VOCs as initiators of both plant growth promotion and defense responses in plants.

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  3. [국내논문]   Isolation and Characterization of Chlorella Virus from Fresh Water in Korea and Application in Chlorella Transformation System  

    Park, Hye-Jin (Department of Microbiology, Pukyong National University ) , Yoon, Hong-Mook (Department of Microbiology, Pukyong National University ) , Jung, Heoy-Kyung (Department of Microbiology, Pukyong National University ) , Choi, Tae-Jin (Department of Microbiology, Pukyong National University)
    The plant pathology journal v.21 no.1 ,pp. 13 - 20 , 2005 , 1598-2254 ,

    초록

    Chlorella viruses are large icosahedral, plaque-forming, dsDNA viruses that infect certain unicellular, chlorellalike green algae. The genomic DNA of over 300 kb contains many useful genes and promoters. Over 40 chlorella viruses have been isolated from fresh water in Korea since 1998. The viruses were amplified initially in chlorella strain NC64A, and pure isolates were obtained by repeated plaque isolation. SDS-PAGE analysis revealed similar but distinct protein patterns, both among the group of purified viruses and in comparison with the prototype chlorella virus PBCV-1. Digestions of the 330- to 350-kb genomic DNAs with 10 restriction enzymes revealed different restriction fragment patterns among the isolates. The tRNA-coding regions of 8 chlorella viruses were cloned and sequenced. These viruses contain 14-16 tRNA genes within a 1.2- to 2-kb region, except for the SS-1 isolate, which has a 1039-bp spacer in a cluster of 11 tRNA genes. Promoter regions of several early genes were isolated and their activities were analyzed in transformed chlorella. Some promoters showed stronger activity than commonly used CaMV 35S promoter and chlorella transformation vectors for heterologous protein are beings constructed using these promoters.

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  4. [국내논문]   Intercellular Trafficking of Homeodomain Proteins   피인용횟수: 1

    Kim, Seon-Won (Department of Food Science & Nutrition, Division of Applied Life Science (BK21), Gyeongsang National University ) , Moon, Jun-Yeon (Division of Applied Life Science (BK21), Gyeongsang National University ) , Jung, Jin-Hee (Division of Applied Life Science (BK21), Gyeongsang National University ) , Chen, Xiongyan (Division of Applied Life Science (BK21), Gyeongsang National University ) , Shi, Chunlin (Division of Applied Life Science (BK21), Gyeongsang National University ) , Rim, Yeong-Gil (Environmental Biotechnology National Core Research Center, Gyeongsang National University ) , Kwon, Hey-Jin (Environmental Biotechnology National Core Research Center, Gyeongsang National University ) , Jackson, David (Cold Spring Habor Laboratory ) , Datla, Raju (Plant Biotechnology Institute, National Research Council of Canada ) , Joliot, Alain (Biologie cellulaire des hom<TEX>$\'{e}$</TEX>prot<TEX>$\'{e}$</TEX>ines ) , Kim, Jae-Yean (Division of Applied Life Science (BK21), Plant Molecular Biology & Biotechnology Research Center, Environmental Biotechnology National Core Research Center, Gyeongsang National University)
    The plant pathology journal v.21 no.1 ,pp. 21 - 26 , 2005 , 1598-2254 ,

    초록

    Homeotic proteins have pivotal roles during the development of both plant and animals. Many homeotic proteins exert control over cell fate in cells where their genes are not expressed, i.e., in a non-cell autonomous manner. Cell-to-cell communication, which delivers critical information for position-dependent specification of cell fate, is an essential biological process in multicellular organisms. In plants, there are two pathways for intercellular communication that have been identified: the ligand/receptor-mediated apoplastic pathway and the plasmodesmata-mediated symplasmic pathway. Regulatory proteins and RNAs traffic symplasmically via plasmodesmata and play a critical role in intercellular communication. Thus, the non-cell autonomous function of homeotic proteins can be explained by the recent discovery of cell-to-cell trafficking of proteins or RNAs. This article specifically focuses on understanding the intercellular movement of homeodomain proteins, a family of homeotic proteins.

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  5. [국내논문]   Identification, Growth and Pathogenicity of Colletotrichum boninense Causing Leaf Anthracnose on Japanese Spindle Tree   피인용횟수: 2

    Lee, Hyang-Burm (Department of Biological Sciences, Seoul National University ) , Park, Jae-Young (Department of Biological Sciences, Seoul National University ) , Jung, Hack-Sung (Department of Biological Sciences, Seoul National University)
    The plant pathology journal v.21 no.1 ,pp. 27 - 32 , 2005 , 1598-2254 ,

    초록

    Leaf anthracnose was observed on leaves of Japanese spindle tree in Seoul, Korea from autumn 2003 to spring 2004. The causal fungus was purely isolated from he leaf spot lesions and cultured on PDA. The colony on PDA was cream to orange but blackish in the center n old cultures. Conidia were formed in blackish orange asses and were cylindrical in shape, measured 13-17 ${\times}$ 5-7 ${\mu}$ m in size. Blackish brown setae were often observed on PDA and ranged up to 100 ${\mu}$ m in length. Based on morphological and ITS region sequence analyses, the fungal strain was identified as Colletotrichum boninense. Koch's postulates were fulfilled by inoculating tree leaves with 1 ${\times}$ $106^6$ conidia per ml in a moist chamber. This is the first study on the pathogenicity, growth and phylogenetic characteristics of C. boninense causing leaf anthracnose on Japanese spindle tree in Korea.

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  6. [국내논문]   Changes in the Sensitivity to Metalaxyl, Dimethomorph and Ethaboxam of Phytophthora infestans in Korea   피인용횟수: 11

    Zhang, Xuan-Zhe (Department of Applied Plant Science, Kangnung National University ) , Ryu, Kyoung-Yul (Laboratory of Crop Protection, National Institute of Highland Agriculture, RDA ) , Kim, Jeom-Soon (Laboratory of Crop Protection, National Institute of Highland Agriculture, RDA ) , Cheon, Jung-Uk (Laboratory of Crop Protection, National Institute of Highland Agriculture, RDA ) , Kim, Byung-Sup (Laboratory of Crop Protection, National Institute of Highland Agriculture, RDA)
    The plant pathology journal v.21 no.1 ,pp. 33 - 38 , 2005 , 1598-2254 ,

    초록

    Changes of control efficacy of chemical to potato late blight caused by Phytophthora infestans in potato fields from 2001 to 2004 were examined. Control efficacy of metalaxyl was suddenly decreased from 100% in 2002 to 50% in 2004 and that of dimethomorph also was similar to those of metalaxyl. However, the control efficacy of ethaboxam no great change. Both A1 and A2 mating type isolates were isolated from 2001 to 2004 in several areas in Korea. The majority of the P. infestans isolates were A1 mating type. Total 939 isolates of P. infestans obtained from several areas in Korea from 2001 to 2004 were examined for changes of sensitivity to metalaxyl. Frequencies of metalaxyl resistance isolates were gradually increased from 17% in 2001 to 84.2% in 2004, but isolation frequencies of metalaxyl sensitive and intermediate resistant isolate were decreased. Cause of decreasing control efficacy of metalaxyl was thought by increase of resistance isolates in A1 mating type population according to increasing metalaxyl use. Most isolates were grown at 0.5 ${\mu}g /ml of dimethomorph and isolates grown at 1 ${\mu}g /ml of dimethomorph were approximately 10.2-22.9%. However, no isolate was able to grow at 5.0 ${\mu}g /ml. Based on these results, minimum inhibitory concentrations (MIC) of dimethomorph to P. infestans were determined to be 0.5-1.0 ${\mu}g /ml. Our results indicated that the reason decreasing control efficacy of dimethomorph was not caused by occurrence of resistant isolates. About 5% and 12.1% isolates among the total isolates collected in 2003 and 2004 were grown on V-8 juice rye agar containing 1.0 ${\mu}g /ml ethaboxam. The 2.1 and 25.4% isolates had MICs of 0.2-0.4 ${\mu}g /ml, and MIC values of 87.9% and 74.3% isolates were less than 0.2 ${\mu}g /ml concentrations of ethaboxam. Therefore, resistance development by P. infestans to ethaboxam is not likely to occur in the natural condition.

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  7. [국내논문]   Functional Analysis of Pepper Cys2/His-Type Zinc-Finger Protein Promoter Region in Response to Bacterial Infection and Abiotic Stresses in Tobacco Using Agrobacterium-Mediated Transient Assay  

    Kim, Sang-Hee (Division of Bioscience and Technology, Korea University ) , Hwang, Byung-Kook (Division of Bioscience and Technology, Korea University)
    The plant pathology journal v.21 no.1 ,pp. 39 - 46 , 2005 , 1598-2254 ,

    초록

    The promoter region flanking the 5' CAZFP1 coding region was isolated from the genomic DNA of Capsicum annuum. To identify the upstream region of the CAZFP1 gene required for promoter activity, a series of CAZFP1 promoter deletion derivatives was created. Each deletion construct was analyzed by Agrobacterium-mediated transient transformation in tobacco leaves after infection by Pseudomonas syringae pv. tabaci, or treatment with methyl jasmonate (MeJA), ethylene, abscisic acid (ABA), salicylic acid (SA), cold and wounding. Promoter fragments of 685 bp or longer showed 7-fold or greater induction after P. s. pv. tabaci infection and MeJA treatment. The CAZFP1 full-length promoter (-999 bp) also showed 6-fold induction in response to ethylene. The transiently transformed tobacco leaves with the CAZFP1 full length promoter fused-GUS gene showed more than 5-fold induction in response to SA, ABA and cold. These results suggest that the CAZFP1 promoter contains responsive elements for pathogen, MeJA, ethylene, SA, ABA and cold.

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  8. [국내논문]   Identification of Glycine max Genes Expressed in Response to Soybean mosaic virus Infection   피인용횟수: 3

    Jeong, Rae-Dong (School of Agricultural Biotechnology and Center for Plant Molecular Genetics and Breeding Research, Seoul National University ) , Lim, Won-Seok (School of Agricultural Biotechnology and Center for Plant Molecular Genetics and Breeding Research, Seoul National University ) , Kwon, Sang-Wook (School of Agricultural Biotechnology and Center for Plant Molecular Genetics and Breeding Research, Seoul National University ) , Kim, Kook-Hyung (School of Agricultural Biotechnology and Center for Plant Molecular Genetics and Breeding Research, Seoul National University)
    The plant pathology journal v.21 no.1 ,pp. 47 - 54 , 2005 , 1598-2254 ,

    초록

    Identification of host genes involved in disease progresses and/or defense responses is one of the most critical steps leading to the elucidation of disease resistance mechanisms in plants. Soybean mosaic virus (SMV) is one of the most prevalent pathogen of soybean (Glycine max). Although the soybeans are placed one of many important crops, relatively little is known about defense mechanism. In order to obtain host genes involved in SMV disease progress and host defense especially for virus resistance, two different cloning strategies (DD RT-PCR and Subtractive hybridization) were employed to identify pathogenesis- and defenserelated genes (PRs and DRs) from susceptible (Geumjeong 1) and resistant (Geumjeong 2) cultivars against SMV strain G7H. Using these approaches, we obtained 570 genes that expressed differentially during SMV infection processes. Based upon sequence analyses, differentially expressed host genes were classified into five groups, i.e. metabolism, genetic information processing, environmental information processing, cellular processes and unclassified group. A total of 11 differentially expressed genes including protein kinase, transcription factor, other potential signaling components and resistant-like gene involved in host defense response were selected to further characterize and determine expression profiles of each selected gene. Functional characterization of these genes will likely facilitate the elucidation of defense signal transduction and biological function in SMV-infected soybean plants.

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  9. [국내논문]   Specific Primer for Detection of Jujube Witches' Broom Phytoplasma Group (16SrV) in Korea  

    Han, Sang-Sub (Division of Forest Science, Chonbuk National University)
    The plant pathology journal v.21 no.1 ,pp. 55 - 58 , 2005 , 1598-2254 ,

    초록

    In order to diagnose and differentiate jujube witches' broom (JWB) phytoplasma rapidly, oligonucleotide primer pair, 16Sr(V) F/R, for polymerase chain reactions (PCRs) was designed on the basis of 16S rRNA sequences of JWB phytoplasma. The PCR employing phytoplasma universal primer pair P1/P7 consistently amplified DNA in all tested phytoplasma isolates. But no phytoplasma DNA was detected from healthy jujube seedlings. The nested PCR, the primer pair 16S(V) F/R, about 460 bp fragment, amplified DNA in all tested JWB and related phytoplasmas including ligustrum witches' broom phytoplasma of the 16S rRNA group V, but no DNA amplification was detected from other phytoplasma strains such as groups 16SrI (Aster yellows) and 16SrXII (Stolbur group) in which mulberry dwarf phytoplasma and chrysanthemum witches' broom phytoplasma belong to, respectively. The same results were obtained from both Korean and Chinese isolates of JWB phytoplasma. Nested-PCR using phytoplasma universal primer pair P1/P7 and 16SrV group-specific primer pair 16S(V) F/R could detect group V phytoplasmas rapidly and easily, in particular JWB phytoplasma.

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  10. [국내논문]   Bacillus subtilis S1-0210 as a Biocontrol Agent against Botrytis cinerea in Strawberries   피인용횟수: 9

    Hang, Nguyen Thi Thu (Department of Plant Medicine, Sunchon National University ) , Oh, Soon-Ok (Department of Plant Medicine and, Sunchon National University ) , Kim, Gyoung-Hee (Department of Plant Medicine, Sunchon National University ) , Hur, Jae-Seoun (Department of Environmental Education, Sunchon National University ) , Koh, Young-Jin (Department of Plant Medicine, Sunchon National University)
    The plant pathology journal v.21 no.1 ,pp. 59 - 63 , 2005 , 1598-2254 ,

    초록

    Bacillus subtilis S1-0210 was selected as a biological agent against Botrytis cinerea in strawberry. The isolate inhibited mycelial growth of B. cinerea in vitro tests. A wettable powder formulation of B. subtilis S1-0210 significantly reduced infection rates with lower than 5%, compared with higher than 70% of infection rates in untreated control. The formulation showed 85 to 89% control efficacies of gray mold incidences on fruits of strawberry in pots. Pre-treatment of the agent was more effective in controlling gray mold on fruits and leaves than post-treatment at the early stage of disease development. The formulation also showed 70% control efficacy of gray mold incidence on fruits of strawberry in a field trial. The results indicate that B. subtilis S1-0210 in the wettable powder formulation may be a potential biocontrol agent to control gray mold on strawberry.

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