• Title/Summary/Keyword: 고추역병균(Phytophthora capsici)

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Analysis of Genes Expressed during Pepper-Phytophthora capsici Interaction using EST Technology (EST기법을 이용한 고추와 고추역병균간의 상호작용에서 발현되는 유전자들의 분석)

  • Kim, Dongyoung;Lee, Jong-Hwan;Choi, Woobong
    • Journal of Life Science
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    • v.24 no.11
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    • pp.1187-1192
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    • 2014
  • Pepper, consumed as a typical spice food around world, is mainly cultivated in warm countries, including Korea, China, and Mexico. Phytophthora capsici is a pathogen on several economically important crops, including pepper. The oomycete attacks the roots, stems, leaves, and fruit of the host plants. To understand the molecular mechanisms underlying development of the disease, the genes expressed during pepper-P. capsici interaction were explored by analyzing expressed sequence tags (ESTs). A cDNA library was constructed from total RNA extracted from pepper leaves challenged with P. capsici for three days, resulting in an early stage of symptom development for comparable interaction. A comprehensive analysis of single-pass sequencing of 5,760 randomly selected cDNA clones extracted 5,148 high-quality entries for contig assembly, which generated 2,990 unigenes. A homology search of the unigenes with BLASTX resulted in 2,409 matches, of which 606 showed classified functional catalogs.

Identification and Antifungal Antagonism of Chryseomomas luteola 5042 against Phytophthora capsici (고추역병균 Phytophthora capsici의 생육을 저해하는 Chryseomonas luteola 5042의 선발과 항진균성 길항작용)

  • 윤경현;이은탁;김상달
    • Microbiology and Biotechnology Letters
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    • v.29 no.3
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    • pp.186-193
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    • 2001
  • A powerful antagonistic bacterium against Phytophthora capsici causing phytophthora blight of red pepper was isolated from the cultivated soil in Kyongju Korea, The bilogical control mechanisms of the isolated strain were caused by strong antifungal antibiotic, siderophore and cellulase. The strain was identified as Chryseomonas luteola by the cultural morphological and physiological characteristics. The opti- mal culture medium for the antibiotic production was determined as follows : 0.15%D(+) cellobiose, 0.55% $NH_4$CI, 0.01% KCI 0.7% $K_2$$HPO_4$ 0.2% $KH_2$PO$_4$ and 0.5% sodium citrate at pH 7.0 The optimal incubation time was 84 hours at $30^{\circ}C$ In pot bioassay, the treatment of C luteola 5042 protected red pepper plant against the blight of Phytophthora capsici.

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Mating Types of Phytophthora capsici Leonian from Red-pepper ( Capsicum annuum L.) in Korea (고추역병균(疫病菌)(Phytophthora capsici Leonian)의 배우자형(配偶子型) 분포(分布))

  • Kim, Jeong-Soo;Do, Tae-Hong;Cho, Eui-Kyoo;Lee, Min-Woong
    • The Korean Journal of Mycology
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    • v.16 no.2
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    • pp.60-63
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    • 1988
  • Each of 103 isolates of Phytophthora capsici was obtained from diseased red pepper plants randomly belonged to either the mating type $A_1$ or the mating type $A_2$. Fifty four isolates were classified as mating type $A_1$, and 49 isolates were classified as mating type $A_2$.Oospores were formed in each combination of isolates between $A_1$ or $A_2$ on 5% V-8 juice agar except one combination.

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3D-QSAR Analysis on the Fungicidal Activity with N-Phenylbenzenesulfonamide Analogues against Phytophthora blight (Phytophthora capsici) and Prediction of Higher Active Compounds (고추역병균(Phytophthora capsici)에 대한 N-Phenylbenzenesulfonamide 유도체들의 살균활성에 관한 3D-QSAR 분석과 고활성 화합물의 예측)

  • Soung, Min-Gyu;Kang, Kyu-Young;Cho, Yun-Gi;Sung, Nack-Do
    • Applied Biological Chemistry
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    • v.50 no.3
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    • pp.192-197
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    • 2007
  • 3D-QSARs on the fungicidal activity of N-phenylbenzenesulfonamide and N-phenyl-2-thienylsulfonamide analogues (1-37) against Phytophthora blight (Phytophthora capsici) were studied quantitatively using CoMFA and CoMSIA methods. The statistical results of the optimized CoMFA (2) model ($r^2_{cv.}(q^2)$ = 0.692 & $r^2_{ncv.}$= 0.965) show better predictability and fitness than CoMSIA (2) model ($r^2_{cv.}(q^2)$ = 0.796 & $r^2_{ncv.}$= 0.958). The fungicidal activities according to the information of the optimized CoMFA (2) model were dependent upon the steric and electrostatic fields of the molecules. Therefore, from the contribution contour maps of CoMFA (2) model, it is expected that 63% contribution was caused by the steric bulk of meta-substituent ($R_1$) on the S-phenyl ring. Also, the other contribution level of 32.9% was represented by the positive charged $R_4-group$ ($R_1$) on the N-phenyl ring and para-substituent ($R_1$) on the S-phenyl ring. A series of higher active compounds, $R_1$= 3-decyl substituent ($pred.pI_50$= 5.88) etc. were predicted based on the findings.

Metalaxyl Sensitivity Related with Distribution Feature of Mating Type of Phytophthora capsici Population from Red Pepper in Korea (국내 고추역병균 Phytophthora capsici 집단의 교배형 분포 특성에 따른 Metalaxyl 감수성)

  • Song, Jeong-Young;Yoo, Sung-Joon;Lee, Youn-Su;Kim, Byung-Sup;Kim, Hong-Gi
    • The Korean Journal of Mycology
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    • v.31 no.2
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    • pp.98-102
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    • 2003
  • Metalaxyl sensitivity related with distribution feature of mating type was characterized far Phytophthora capsici population, totally 433 isolates of the red-pepper pathogen collected from 75 pepper fields in Korea from 1995 to 1998. At the concentration of metalaxyl $2{\mu}g/ml$, inhibition rate of mycelial growth of P. capsici isolates was 68.2% in average compared to control, and 28.6% isolates in average were estimated as resistance to the chemical. Isolates of field unit with a single mating type revealed similar level of sensitivity to metalaxyl and showed sensitive or resistant in most field units. However, isolates of field units with both mating types revealed diverse sensitivity level to the chemical and various occurrence ratio of metalaxyl sensitive : resistant in each field unit. Results indicated that different levels of metalaxyl sensitivity of P. capsici population in Korea seem to be closely related with occurrence ratio of A1 : A2 mating type of each field.

Selection and Antagonistic Mechanism of Pseudomonas fluorescens 4059 Against Phytophthora Blight Disease (고추역병과 시들음병을 방제하는 토착길항세균 Pseudomonas fluorescens 4059의 선발과 길항기작)

  • Jeong, Hui-Gyeong;Kim, Sang-Dal
    • Microbiology and Biotechnology Letters
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    • v.32 no.4
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    • pp.312-316
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    • 2004
  • In oder to select the powerful rhizophere-dorminatable biocontrol agent, we had isolated an indigenous antagonistic bacterium which produced antibiotic and siderophore from a disease suppressive local field soil of Gyungsan, Korea. And we could select the Pseudomosp. 4059 which can strongly antagonize against Fusarium oxysporum and Phytophthora capsici by two kinds of antifungal mechanism that can be caused by the antibiotic of Phenazin, a siderophore and a auxin like subThe selected strain was identified as Pseudomonas fluorescens (biotype A) 4059 by biochemical tests, API $\textregistered$ test, MicroLog TM system and 16S rDNA analysis. The selected antagonistic microorganism, Pseudomosp. 4059 had an antifungal mechanism of antifungal antibiotic and sidrophore. And we were confirmed the antagonistic activity of P fluorescens 4059 with in vitro antifungal test against Phytophthora capsici and in vivo by red-pepper.

Purification and Characteriztion of an Antifungal Antibiotic from Bacillus megaterium KL 39, a Biocontrol Agent of Red-Papper Phytophtora Blight Disease. (고추역병균 Phytophthora capsici를 방제하는 길항균주 Bacillus megaterium KL39의 선발과 길항물질)

  • 정희경;김상달
    • Microbiology and Biotechnology Letters
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    • v.31 no.3
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    • pp.235-241
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    • 2003
  • For the biological control of Phytophthora blight of red-pepper caused by Phytophthora capsici, an antibiotic-producing plant growth promoting rhizobacteria (PGPR) Bacillus sp. KL 39 was selected from a local soil of Kyongbuk, Korea. The strain KL 39 was identified as Bacillus megaterium by various cultural, biochemical test and API and Microlog system. B. megaterium KL 39 could produce the highest antifungal antibiotic after 40 h of incubation under the optimal medium which was 0.4% fructose, 0.3% yeast extract, and 5 mM KCl at 30 C with initial pH 8.0. The antifungal antibiotic KL 39 was purified by Diaion HP-20 column, silica gel column, Sephadex LH-20 column, and HPLC. Its RF value was confirmed 0.32 by thin-layer chromatography with Ethanol:Ammonia:Water = 8:1:1. The crude antibiotic KL39 was active against a broad range of plant pathogenic fungi, Rhizoctonia solani, Pyricularia oryzae, Monilinia fructicola, Botrytis cinenea, Alteranria kikuchiana, Fusarium oxysporum and Fusarium solani. The purified antifungal antibiotic KL39 had a powerful biocontrol activity against red-pepper phytophthora blight disease with in vivo pot test as well as the strain B. megaterium KL 39.

Cloning and Characterization of a Cellulase Gene from a Plant Growth Promoting Rhizobacterium, Bacillus subtilis AH18 against Phytophthora Blight Disease in Red-Pepper (고추역병을 방제하는 PGPR균주 Bacillus subtilis AH18의 항진균성 Cellulase 유전자의 Cloning 및 효소 특성 조사)

  • Woo, Sang-Min;Jung, Hee-Kyoung;Kim, Sang-Dal
    • Microbiology and Biotechnology Letters
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    • v.34 no.4
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    • pp.311-317
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    • 2006
  • Using PCR amplification, we cloned a cellulase gene (ce/H) from the Bacillus subtilis AH18 which has plant growth-promoting activity and antagonistic ability against pepper blight caused by Phytophthora capsici. The 1.6 kb PCR fragment contained the full sequence of the cellulase gene and the 1,582 bp gene deduced a 508 amino acid sequence. Similarity search in protein database revealed that the cellulase of B. subtilis AH18 was more than 98% homologous in the amino acid sequence to those of several major Bacillus spp. The ce/H was expressed in E. coli under an IPTG inducible lac promoter on the vector, had apparent molecular weight of about 55 kDa upon CMC-SDS-PAGE analysis. Partially purified cellulase had not only cellulolytic activity toward carboxymethyl-cellulose (CMC) but also insoluble cellulose, such as Avicel and filter paper (Whatman No. 1). In addition, the cellulase could degrade a fungal cell wall of Phytophthora capsici. The optimum pH and temperature of the ce/H coded cellulase were determined to be pH 5.0 and $50^{\circ}C$. The enzyme activity was activated by $AgNO_3$ or $CoCl_2$. However its activity was Inhibited by $HgC1_2$. The enzyme activity was activated by hydroxy urea or sodium azide and inhibited by CDTA or EDTA. The results indicate that the cellulase gene, ce/H is an antifungal mechanism of B. subtilis AH18 against phytophthora blight disease in red-pepper.

Distribution and Alteration of Mating Type of Phytophthora capsici Population from Red Pepper in Korea (국내 고추역병균 Phytophthora capsici 집단의 교배형 분포 및 변화)

  • Song, Jeong-Young;Yoo, Sung-Joon;Kim, Hong-Gi
    • The Korean Journal of Mycology
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    • v.30 no.2
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    • pp.152-156
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    • 2002
  • Distribution and alteration of mating type of Korean population for Phytophthora capsici were monitored from 1995 to 1998. Total 973 isolates collected from 75 pepper fields throughout the country were divided into A1 mating type 573 isolates and A2 mating type 400 isolates. Both mating types were founded in all provinces examined, but the distribution patterns differed between the fields, The single mating type of A1 or A2 isolates was found in some fields, whereas various combinations of both mating types were in all years and provinces surveyed. Ratios of A1 and A2 were varied with years and fields. However, only single mating type either A1 or A2 was detected in some fields. While, in another field located in Gongju, only A2 isolates were detected in 1995 and 1997, but A1 isolates were appeared in 1998. Varied ratios and alterations of A1 and A2 mating type in fields indicate a potential sexual recombination of the fungus, which may cause genetic diversity.

An Antifungal Subatance, 2,4-Diacetylphloroglucinol Produced from Antagonistic Bacterium Pseudo-monas fluorescens 2112 Against Phytophthora capsici (Phytophthora capsici를 길항하는 Pseudononas fluorescens 2112가 생산하는 항진균 항생물질 2,4-diacetylphloroglucinol)

  • 이은탁;김상달
    • Microbiology and Biotechnology Letters
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    • v.29 no.1
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    • pp.37-42
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    • 2001
  • An antifungal substance was purified from culture broth of Pseudomonas flulorescens 2112 that showed a broad-spectrum antagonistic activity against various phytopathogenic fungi including capsici. The substance was identified as 2,4-diacetylphloro-glucinol basd on NMR analysis. The 2,4-diacetylphloroglcinol showed antibiotic activity in broad acidic range from pH 1.0 to pH 9.0. About 83% of initial activity was remained after incubation for 30min ar $60^{\circ}C$, however, the activity was dropped up to 50% after 30 min incubation in $80^{\circ}C$. When the nucleotides of P. capsici treated with 2,4-diacetylphloroglucinol were labeled with[$^{3}$ H]-Adenin, the newly synthesized and radioactive-labeled RNA was significantly reduced than those of untreated P. capsici. indicating that the 2,4-diacetylphloroglucinol inhibits RNA synthesis.

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