• 한국응용곤충학회지
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• 제26권4호
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• pp.229-237
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• 1987

참깨토양전염병해(土壤博染病害)의 생물학적(生物學的) 방제법(防除法)을 구명(究明)하기 위하여 참깨근권토양(根圈土壤)에서 Bacillus spp., Streptomyces spp., Trichoderma spp. 등을 분리(分離)하여 항균성(抗菌性)이 강(强)한 균주(菌株)를 선발(選拔)하고 참깨에 처리(處理)하여 입고병방제(立枯病防除)의 효과(效果) 및 참깨 생육(生育)에 미치는 영향(影響)을 조사(調査)하였다. 1. 참깨근권토양(根圈土壤)에서 분리(分離)한 Bacillus spp. 중(中) 26%가 F. oxysporum과 R. solani에 항균성(抗菌性)을 나타내었다. 그 중(中) B. subtilis와 B. polymyxa가 중요한 종(種)이었다. 2. 참깨근권토양(根圈土壤)에서 분리(分離)한 Streptomyces는 F oxysporum의 균사(菌絲)와 포자(胞子)의 세포벽(細胞壁)을 분해(分解)하고 대형분생포자(大型分生胞子)와 후막포자(厚膜胞子)의 형성(形成)을 현저(顯著)히 감소(減)少시켰다. 3. 참깨경작지(耕作地)에서 분리(分離)한 Trichoderma spp.의 84%가 oxysporum에 60%가 F. oxysporum과 R. solani에 동시(同時)에 항균성(抗菌性)을 보였다. 4. 분리(分離)된 Trichoderma spp. 중(中) 항균성(抗菌性)이 강(强)한 T. viride TV-192를 F. oxysporum과 함께 처리(處理)한 결과(結果) 입고병(立枯病)의 발생율(發生率)이 현저(顯著)히 감소(減少)하였다. 5. T. viride는 볏짚, 보리짚, 톱밥등 유기태영양원(有機態營養源)에서 F. oxysporum보다 생장(生長)이 빨랐다. F. oxysporum은 톱밥에서는 거의 생장(生長)하지 못하였다. 6. 밀기울, 밀기울+톱밥배지(培地)에 T. viride를 배양(培養)하여 토양(土壤)에 첨가(添加)한 결과(結果), F oxysprum에 의한 입고병(立枯病)을 현저히 감소시켰으나 T. viride의 밀도(密度)가 높을 때 참깨의 종자발아(種子發芽)와 묘(苗)의 생장(生長)이 저해(沮害)되고 다수(多數)의 묘(苗)가 사멸(死滅)하였다. 7. Trichoderma spp.에 의(依)한 참깨 종자발아(種子發芽) 및 묘생장(苗生長) 억제(抑制)의 영향(影響)은 분리균주(分離菌株)에 따라 큰 차이를 보였고 Trichoderma viride 토양처리시(土壤處理時) 건전묘(健全苗)는 무처리(無處理)보다 생장(生長)이 촉진(促進)되었다.

• International Journal of Industrial Entomology and Biomaterials
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• 제31권2호
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• pp.107-114
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• 2015

Endophytes provide multifarious benefits such as promotion of plant growth and yield, suppression of phyto-pathogens, phosphate solubilising and fixation nitrogen. A study has been carried out to explore growth promotion and antifungal activities of endophytes of mulberry (Morus spp.). Endophytic bacteria were isolated from mulberry plants and studied their cultural, morphological characters, growth promotion as well as their antifungal activity against Rhizoctonia bataticola and Fusarium oxysporum , two mulberry root rot associated pathogens. Except two isolates, all bacteria were colourless and the colony size of eight isolates was small. The margin of five isolates was irregular and the consistency of three isolates was creamy, six isolates was slimy and one was mucoid. Texture of seven isolates was convex and others were flat. Eight isolates were gram positive and the rest Gram negative, five were cocci and others were bacilli (rod shaped). Four isolates were motile and all were catalase positive and only three isolates were oxidase positive. Spore staining was positive only for two isolates. The growth promotion study showed that there was significant difference in root length and seedling length. The antagonistic effect of the bacterial isolates was tested against R. bataticola showed significant (p <0.05) influence of the bacteria, days after inoculation and their interaction on the inhibition of fungal growth. The isolate En-7 completely inhibited the fungus followed by En-5 (66.67%). The bacterial isolates significantly (p <0.05) inhibited growth of F. oxysporum in PDA. The mean inhibition was higher (70.45%) in case of En-7 followed by En-8 (68.65%) and En-10 (66.44%). The study reveals that some endophytic bacteria associated with mulberry have growth promotion and antifungal activity and could be explored for promotion of mulberry growth and managing root rot disease.

• 대한미생물학회지
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• 제22권1호
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• pp.15-22
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• 1987

Pulmonary fungal infection has been investigated in patients with healed or active pulmonary tuberculosis or other lung diseases by demonstrating serum precipitating antibodies to the various fungal antigens and by isolating the related fungi from sputums or other clinical specimens. Out of 1,192 suspected patients, 405(34.0%) showed precipitin bands on immunodiffusion tests and the related fungi have been demonstrated in sputums or other specimens of 79.5% of them(327) whose specimens had been cultured. Three patients did not have precipitating antibodies to any fungal antigen, but the same fungus was repeatedly isolated from sputums of two patients for over one year of period and from open lung biopsy specimen in the other patient. Most commonly involved species in pulmonary infection were A. fumigatus(70.3%) and C. albicans (at least 23.8%), followed by A. flavus, P. boydii, A. nidulans, etc. Out of fungi isolated from individuals(459), who were apparently not infected with fungi, molds were 66.0% and the rest, yeasts. Most commonly encountered molds were aspergilli(31.7%), followed by penicilli(16.3%), Cladosporium spp.(2.8%), Fusarium spp.(2.2%), etc. C. albicans(16.6%) was of course most common yeast in human sputums and the other species were seen in few.

• 한국환경농학회지
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• 제31권1호
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• pp.68-74
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• 2012

BACKGROUND: Some microorganisms extant in nature have ability to suppress various plant pathogens, and also can promote plant growth. Thus microorganisms are such great source of antimicrobial agents to develop antagonistic microorganism production and eco-friendly crop management. We isolated the microorganisms in various eco-friendly formulations. The suppressive abilities against plant pathogens have been characterized in vitro level. METHODS AND RESULTS: The indigenous microorganisms have been isolated from Cooked rice, Black sugar, Rice Bran, and Red clay using dilution plating method. Population of bacteria and fungi were above 107 in the all formulations. We isolated and pure cultured the microorganisms based on morphological characteristics. Three major plant pathogens (Fusarium oxysporum, Rhizoctonia solani, Phytophthora capsici) have been used to select antagonistic microorganisms. Total 20 bacteria and 9 fungi showed the pathogen growth suppression ability in vitro condition. The selected microorganisms were identified by ITS sequence similarity. CONCLUSION: All tested eco-friendly formulations contained high-density of the microorganisms. Among the isolated microorganisms, Bacillus spp. and Streptomyces spp. showed the most effective antifungal activity against the plant pathogens such as F. oxysporum, R. solani, and P. capsici. Among the selected fungi Trichoderma sp. demonstrated antifungal activity. Our results suggest that the currently adapted eco-friendly formulations might useful for sustain agricultural system.

• 한국자원식물학회:학술대회논문집
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• 한국자원식물학회 2020년도 춘계학술대회
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• pp.80-80
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• 2020

인삼(수삼)은 장기 유통할 때 품질관리에 어려움을 겪고 있고 이는 잘못된 저장, 세척 등의 기술에서 비롯되는 것으로 포장 기술만으로는 고품질 수삼 유통을 실현하기 어렵다. 따라서 연구결과를 토대로 수출용 인삼 수확후 품질관리 과정을 정리하여 매뉴얼화 하였다. 인삼의 수확후 생리적 특성과 품질저하 요인은 물론 수확에서 저장, 세척·건조, 상품성 향상 포장 방법, 냉장컨테이너 적재, 저온 수송 및 판매 시 주의사항 등을 기술하였다. 수삼의 유통 중 손실율에 가장 크게 영향을 미치는 요인은 물러짐과 곰팡이 발생에 의한 부패, 뇌두부위 출아에 의한 상품가치 하락으로 나타났다. 출아는 수확 시기에 따라 다르게 나타나 가을수확 수삼에서는 저장기간 뇌두부위 출아는 전혀 발생하지 않았고, 봄수확 수삼의 경우 수확시기가 늦으면 뇌두 출아가 증가하는 경향을 보였다. 부패 병원균은 25℃ 운송 시 Fusarium spp.가 15, 5, 1℃ 운송 시 Botrytis spp.가 주를 이루었다. 포장단위를 5kg 대포장과 500g 소포장으로 하였을 때 소포장의 물러짐 현상이 대포장보다 훨씬 높게 나타나는 반면 곰팡이 발생에 의한 부패는 대포장보다 낮게 나타났다. 수삼 저장온도에 따라 유통 중 품질이 크게 달라져 온도 -2℃ 이하에 저장한 수삼은 유통 중 손실률이 높고 특품의 비율이 낮아지는 등 품질이 저하되며 저장기간이 길수록 더욱 심화되는 반면 0℃ 저장 수삼은 저장 3개월 후에도 유통 중 품질의 변화가 적었다. 이러한 결과를 종합적으로 정리하여 인삼의 전통적인 수확후 관리 방법이 아니라 수출용 인삼의 품질 향상을 위해 개선된 수확후 관리 방법을 적용할 수 있도록 흐름도로 정리하였다.

• 한국균학회소식:학술대회논문집
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• 한국균학회 2015년도 춘계학술대회 및 임시총회
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• pp.20-20
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• 2015

Endophytic fungi are microorganisms inhabiting living plant tissues without causing apparent harm to the host. They are drawing increasing attention due to their ability to produce various bioactive compounds as well as their effects on host growth and resistance to biotic and abiotic stresses. As a first step to assess biodiversity of plant associated fungi in Korea and the following evaluation on diverse biological activities, we are collecting endophytic fungi from plant in wild followed by systematic long-term storage in liquid nitrogen. Molecular identification using ITS sequences was also incorporated for pure culture by hyphal tip isolation. As of April 2015, about 1,400 fungal strains had been isolated from about 170 plant taxa. Fungal isolates belonging to Pleosporales, Diaporthales, Glomerellales, Hypocreales, and Xylariales were the most abundant. These collections are being used for several complementary researches, including screening of isolates with novel bioactive compounds or conferring drought stress resistance, phylogenetic and genomic study. Genome sequencing was performed for 3 isolates, one Xylaria sp. strain JS573 producing griseofulvin, an antifungal compound, and two Fusarium spp. strains JS626 and JS1030, which are assumed to be new species found in Korea. More detailed analysis on these genomes will be presented. These collections and genome informations will serve as invaluable resources for identifying novel bioactive materials in addition to expand our knowledge on fungal biodiversity.

• The Plant Pathology Journal
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• 제26권1호
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• pp.32-36
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• 2010

Twelve fungal isolates out of 123 isolates obtained from cysts and soils of potato cyst nematode (PCN)-infested fields in Central Java, Indonesia had parasitic abilities of over 50% on PCN eggs or females (cysts) in vitro pathogenicity tests. Cultural and morphological characters and DNA sequences of ribosomal genes in ITS region revealed that they were four isolates of Gliocladium (Trichoderma) virens, three isolates of Fusarium oxysporum, one of F. lateritium, one of Penicillium tritinum and two of Taralomyces spp. A hundred percent infections occurred in eggs or cysts by three fungal isolates G. virens, F. oxysporum and P. oxalicum, suggesting that these fungi may have a good potential for the PCN biocontrol. Especially, G. virens isolates, which occurred most frequently in the PCN-infested potato fields and are known to be highly adaptable to varying habitats, may be developed as reliable agents for controlling PCN with both egg- and cyst-parasitic capabilities and with high ecological adaptabilities.

• Journal of Microbiology and Biotechnology
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• 제14권3호
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• pp.599-606
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• 2004

Gram-positive antagonistic bacilli were isolated from agricultural soils for possible use in biocontrol of plant pathogenic fungi, Fusarium oxysporum, Rhizoctonia solani, and/or Pythium ultimum. Among the 65 antagonistic Gram-positive soil isolates, 22 strains were identified as Bacillus species by 16S rDNA sequence analyses. Four strains, including DF14, especially exhibited multiple antagonistic properties against the three damping-off fungi. Genotypic properties of the Bacillus isolates were characterized by rapid molecular fingerprinting methods using repetitive extragenic palindromic-PCR (REP-PCR), ribosomal intergenic spacer-length polymorphisms (RIS-LP), 16S rDNA PCR-restriction fragment length polymorphisms (PCR-RFLP), and strain-specific PCR assays. The results indicated that the REP-PCR method was more valuable than the RIS-LP and 16S rDNA PCR-RFLP analyses as a rapid and reliable approach for bacilli typing and identification. The use of strain-specific primers designed based on 16S rDNA sequence comparisons enabled it to be possible to selectively detect a strain, DF14, which is being used as a biocontrol agent against damping-off fungi.

• The Plant Pathology Journal
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• 제19권1호
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• pp.51-56
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• 2003

Rehmannia glutinosa is one of the most important medicinal crops in Korea. However, various plant pathogens, including Fusatium spp., cause great damage on R. glutinosa and result in enormous economic losses. This study was conducted to breed Fusarium-resistant plants by using Agrobacterium tumefaciences and AFP (anti-fungal protein) gene. The plant material used was a native accession of R. glutinosa. The PCR analysis was conducted to verify transgenicity. Based on the PCR analysis, nptII band was observed in transgenic plant genome. Southern blot and AFP protein analyses also showed the expression of this gene in transgenic plants. Expression of AFP in transgenic plants offers the possibility of developing resistance to fungal infection.

• 한국응용곤충학회지
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• 제27권3호
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• pp.159-164
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• 1988

Five nematophagous fungi were evaluated for their nematicidal effect in vitro on Rhabditis sp. and Meloidogyne hapla in soil. Inocula of Arthrobotrys arthrobotryoides, A. conoides, A. oligospora, Dactylella lobata, and Fusarium oxyaporum were grown in moistened corn-sandy soil and chopped potato-sandy soil media, and incubated at 26$^{\circ}C$ for one week. The prepared inocula were incorporated in autoclaved sandy soil, mixing thoroughly at rates equ-invalent to 1:50, 1:100, 1:200, and 1:400, repectively, before 80g of the mixture carrying 100 Rhabditis sp. was put into petri plates. Nematophagous fungi effectively teduced the popuation of Rhabditis sp. in soil in a week or two following treatment of the incula at concentration of 1:50 and 1:100. The optimum was at $25^{\circ}C$ for nematicidial effect as high as 80-100%. The at the rate of 1:100 prepared incula were incorporated in auto-claved soil, where 100 Juveniles M. hapla were introduced per 80% soil. All fungi infected the M. hapla effectively in soil, caysing more than 90% mortality within one week. This result indicated the potential value of these fungi as promising biocontrol agents.