• The Plant Pathology Journal
• /
• 제27권4호
• /
• pp.354-359
• /
• 2011

Chemotype composition of Fusarium graminearum strains, isolated from durum wheat kernels from naturally FHB infected fields in Northern and Central Italy, was investigated by multiplex PCR. The different climatic and environmental conditions of the two examined areas separated by the Apennines affected the composition of chemotypes. 15Ac-DON chemotype was predominant in both the sub areas. Nivalneol chemotype was more frequent in the warmer sub area.

• 한국식물병리학회:학술대회논문집
• /
• 한국식물병리학회 2003년도 정기총회 및 추계학술발표회
• /
• pp.123.2-124
• /
• 2003

Fusarium graminearum (telomorph：Gibberella zeae), an important fungal pathogen of cereal crops with ubiquitous geographic distribution, produces mycotoxins on diseased crops that has threaten human and animal health. Recently severe epidemics of scab diseases of barley and rice by this fungus occurred in Korea, causing serious economic losses. To determine genetic diversity of F. graminearum from rice in Korea, a total of 269 isolates were obtained from Southern part of Korea during 2001-2002. A phylogenetic tree of the isolates was constructed by using amplified fragment length polymorphism (AFLP). Population structure of the rice isolates consists of a single lineage (lineage 6). Frequency of female fertility among these Isolates was relatively low (37％) compared to that among lineage 7 isolates from Korean corn. PCR amplification using chemotype specific primers derived from Tri7 and Tri13 genes at the trichothecene biosynthesis gene cluster revealed that most isolates (260) were NIV chemotype；9 isolates were identified as DON chemotype by Tri13 but as either NIV chemotype or unknown by Tri7. The result of chemical analysis also supported the chemotype determination；all of the NIV chemotype isolates produced NIV, whereas the 9 isolates produce either DON or no toxin.

• The Plant Pathology Journal
• /
• 제26권4호
• /
• pp.321-327
• /
• 2010

We performed diagnostic PCR assays and a phylogenetic analysis using partial sequences of TEF1 (translation elongation factor-1) to determine the trichothecene chemotypes and genetic diversity of F. graminearum isolates from maize and rice samples collected in 2009 in Korea. PCR using a species-specific primer set revealed a total of 324 isolates belonging to the putative F. graminearum species complex. PCR with trichothecene chemotypespecific primers revealed that the nivalenol (NIV) chemotype was predominant among the fungal isolates from rice (95%) in all provinces examined. In contrast, the predominant chemotype among the corn isolates varied according to region. The deoxynivalenol (DON) chemotype was found more frequently (66%) than the NIV chemotype in Gangwon Province, whereas the NIV chemotype (70%) was predominant in Chungbuk Province. Phylogenetic analysis showed that all DON isolates examined were clustered into lineage 7, while the NIV isolates resided within lineage 6 (F. asiaticum). Compared with previous studies, the lineage 6 isolates in rice have been predominantly maintained in southern provinces, while the dominance of lineage 7 in maize has been evident in Gangwon at a slightly reduced level.

• 한국약용작물학회지
• /
• 제12권6호
• /
• pp.459-462
• /
• 2004

이 연구는 국내 8개 지역에서 수집한 꽃향유의 정유성분을 분석하여 화학형을 분류하고, 이들 화학형 성분이 항산화 작용과 식품부패균을 억제하는 효과가 있는지를 알고자 하였다. 정유성분 분석결과 3개의 화학형으로 구분할 수 있었다. 화학형 1의 주성분은 dihydrotaketone (DT type)이었다. 개화기를 기준하여 꽃향유의 개체에 따라 naginatketone (NK type)이 60% 이상을 함유한 것과 elsholtziaketone (EK type)을 60% 이상 함유한 개체로 분류할 수 있었고, 또한 이들 두 성분은 종자세대 후에도 EK type은 elsholtziaketone이 주성분으로 나타났고 NK type은 naginataketone이 주성분인 것이 확인되었다. 따라서 NK type은 제2 화학형으로 그리고 EK type은 제3 화학형으로 구별하였다. 항산화 효과는 $6\;mg/{\ell}$ 농도에서 나타났으며, 같은 농도에서 DT>NK>EK 순으로 항산화능을 보였다. NK type은 Streptomyces와 Bicillus에서, EK type은 Streptomyces와 Pseudomonas에서 높은 항균능력을 보였다.

• 한국미생물·생명공학회지
• /
• 제19권6호
• /
• pp.561-567
• /
• 1991

Identification of the Actinomycetes isolate strain No. 497 producing an actinomycin antibiotic MT-497 was performed by ISP and chemotaxonomic methods. The strain Nu. 497 formed various shapes of sclerotia and smooth surface spore. Menaquinone MK-9 ($H_6, H_8$) and iso-, anteiso-branched $C_{15}C_{17}$ fatty acids were detected from whole cell extract. The wall chemotype of stram No. 497 was decided as wall chemotype I from the analysis of DAP isomer, peptidoglycan type and sugar pattern. From these morphological, chemotaxonomic characteristics and analysis of various physiological characteristics. the strain No. 497 was identified as Streptomyces nigrifaciens.

• 약학회지
• /
• 제38권3호
• /
• pp.274-280
• /
• 1994

A strain of actinomycetes producing extracellular adenosine deaminase inhibitor, strain V-8, was isolated from soil. Strain V-8 was gam positive and its cell wall chemotype was decided as cell wall chemotype I from analysis of diaminopimelic acid isomers and sugar pattern. This strain had a wide range of sugar utilization as carbon sources. The optimal pH and temperature for growth were $6.8{\sim}7.0$ and $28{\sim}30^{\circ}C$, respectively. From the morphological, chemotaxonomical characteristics and analysis of various physiological characteristics, the strain V-8 was identified Streptomyces sp.

• 한국미생물·생명공학회지
• /
• 제24권3호
• /
• pp.311-315
• /
• 1996

A cytotoxic material was produced by strain No. 5-99 which was isolated from soil. Analyzing the cell wall components, LL-diaminopimelic acid was identified. From the existance of glycine in the cell wall, this strain was identified to Streptomyces sp. which has cell wall chemotype I and peptidoglycan type A3 connected by glycine. So, we named this strain to Streptomyces sp. YJB-599. The Active material was purified through solvent extraction, silica gel column chromatography and crystallized to needle-shaped white -crystal. Analyzing the structure of this crytal by instrumental analysis and database, it was determined to genistein.

• 한국균학회소식:학술대회논문집
• /
• 한국균학회 2016년도 춘계학술대회 및 임시총회
• /
• pp.33-33
• /
• 2016

Mycotoxins are toxic secondary metabolites produced by fungi. They can be present in where agricultural-based commodities are contaminated with toxigenic fungi. These mycotoxins cause various toxicoses in human and livestock when consumed. Small grains including corn, barley, rice or wheat are frequently contaminated with mycotoxins due to infection mainly by toxigenic Fusarium species and/or under environment favorable to fungal growth. One of the most well-known Fusarium toxin groups in cereals is trichothecenes consisting of many toxic compounds. Deoxynivalenol (DON), nivalenol (NIV), T-2 toxin, and various derivatives belong to this group. Zearalenone and fumonisin (FB) are also frequently produced by many species of the same genus. In order to monitor Korean cereals for contamination with Fusarium and other mycotoxigenic fungal species as well, barley, corn, maize, rice grains, and soybean were collected from fields at harvest or during storage for several years. The fungal colonies outgrown from the grain samples were identified based on morphological and molecular characteristics. Trichothecene chemotypes of Fusarium species or presence of FB biosynthetic gene were determined using respective diagnostic PCR to predict possible toxin production. Heavy grain contamination with fungi was detected in barley, rice and wheat. Predominant fungal genus of barley and wheat was Alternaria (up to 90%) while that of rice was Fusarium (~40%). Epicoccum also appeared frequently in barley, rice and wheat. While frequency of Fusarium species in barley and wheat was less than 20%, the genus mainly consisted of Fusarium graminearum species complex (FGSC) which known to be head blight pathogen and mycotoxin producer. Fusarium composition of rice was more diverse as FGSC, Fusarium incarnatum-equiseti species complex (FIESC), and Fusarium fujikuroi species complex (FFSC) appeared all at considerable frequencies. Prevalent fungal species of corn was FFSC (~50%), followed by FGSC (<30%). Most of FFSC isolates of corn tested appeared to be FB producer. In corn, Fusarium graminearum and DON chemotype dominate within FGSC, which was different from other cereals. Soybeans were contaminated with fungi less than other crops and Cercospora, Cladosporium, Alternaria, Fusarium etc. were detected at low frequencies (up to 14%). Other toxigenic species such as Aspergillus and Penicillium were irregularly detected at very low frequencies. Multi-year survey of small grains revealed dominant fungal species of Korea (barley, rice and wheat) is Fusarium asiaticum having NIV chemotype.

• 한국약용작물학회:학술대회논문집
• /
• 한국약용작물학회 2009년도 심포지엄 및 춘계학술발표회
• /
• pp.167-168
• /
• 2009

• 한국약용작물학회:학술대회논문집
• /
• 한국약용작물학회 2009년도 심포지엄 및 춘계학술발표회
• /
• pp.307-308
• /
• 2009