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First Report of an Unrecorded Nematode-trapping Fungus, Arthrobotrys sinensis in Korea
하지혜,강헌일,강항원,김동근,이동운,김용철,최인수,Ha, Jihye,Kang, Heonil,Kang, Hangwon,Kim, Donggeun,Lee, Dongwoon,Kim, Yongchul,Choi, Insoo Korean Society of Applied Entomology 2019 한국응용곤충학회지 Vol.58 No.1
선충포식성 곰팡이는 선충을 포획하기 위하여 다양하고 특수한 기관을 사용한다. 국내 성주지역의 참외 경작지 뿌리 주변의 토양에서 3차원 접착 고리를 형성하여 선충을 포획하는 곰팡이를 분리하였다. 곰팡이의 미세형태 구조를 관찰한 결과 분생포자병은 직립형으로 길이는 $290{\sim}528(342.8){\mu}m$으로 길었으며, 계란형의 $30.5{\times}20.3{\mu}m$ 크기를 가진 1~3개의 분생포자를 형성하였다. 균주의 rDNA의 5.8 S 영역의 염기서열을 분석한 결과, Arthrobotrys속의 계통군에 속하였으며, 특히 Arthrobotrys sinensis와 99%의 유사성을 보였다. 형태적 특징과 분자생물학적 계통 분석을 바탕으로 본 균주는 A. sinensis로 확인되었으며, 이는 국내 미기록종으로 식물기생성선충의 생물학적 조절을 위한 하나의 자원이 될 수 있다. Nematode-trapping fungi use various specialized traps to capture nematodes. A fungus that can capture nematodes in three dimensional adhesive networks was isolated from the soil around the root of Cucumis melo L. (Oriental melon) in Seongju, Korea. The conidiophores were found to be septate, hyaline, erect and $290-528(342.8){\mu}m$ high. It produces obovoid shape and 1-3 septate (commonly 2-septate) conidia with a size of $30.5{\times}20.3{\mu}m$. Molecular analysis of 5.8 S rDNA displayed 99% similarity to Arthrobotrys sinensis. On the basis of morphological, morphometric and molecular studies, the fungus was identified as A. sinensis. It is the first report in Korea which can be one of biological control resource of plant-parasitic nematode.
강헌일 ( Heonil Kang ),전태환 ( Taehwan Jun ),권순욱 ( Soonwook Kwon ),김선태 ( Suntae Kim ),강항원 ( Hangwon Kang ),김용철 ( Yongchul Kim ),김동근 ( Donggeun Kim ),고형래 ( Hyoungrai Ko ),최인수 ( Insoo Choi ) 한국환경과학회 2018 한국환경과학회지 Vol.27 No.12
This study was conducted to evaluate resistance of 10 different cowpea cultivars which were introduced from the United States against two major root-knot nematodes, Meloidogyne arenaria and M. incognita, that affect greenhouse crop cultivation in Korea. The results showed that the resistance of the tested cultivars to the root-knot nematodes varied with the cultivar. Texas Cream 40 showed moderate resistance to M. arenaria whereas the other cultivars were susceptible. Purple Hull Pinkeye and Texas Pinkeye Purple Hull were found to be resistant to M. incognita, whereas Mississippi Silver showed moderate resistance and the other cultivars were susceptible. As the cultivars exhibit resistance to M. arenaria and M. incognita, such cultivars resistant to root-knot nematodes should be considered during the cultivation of cowpea as a green manure crop.
강제 호기 호흡계를 이용한 녹비 및 유기자재 처리 토양의미생물 활성 실시간 모니터링과 분해율 평가
정석호, 박종찬, 이은진, 조진웅, 정덕영, 이상은, 유진희, 강항원, 한광현 忠北大學校 農業科學硏究所 2014 農業科學硏究 Vol.30 No.2
Soil organic matter plays an important role in sustaining soil fertility due to its improvement of physical, chemical, and biological functions of soil. For external organic matter amended to provide those benefits, decomposition of the organic matter is the most important prerequisite, which is often done by soil microorganism and affected by numerous environmental as well as substrate-dependent factors. We have devised an advanced respirometer that can minimize fluctuations in soil environmental variables and measure precisely CO2 emission fluxes from organic matter-amended soils.Among examined green manure (barley, rye, hairy vetch, and milk vetch), barley and rye showed most high CO2 emission rates, regardless of their C/N ratios, which suggestsproportion of labile organic C and application dosewere the dominantcontrolling factors, rather than apparent C content and bulk C/N ratio. Similarly, the examined leguminous green manure, in spite of their high N contents, showed a significant lag time before active decomposition started.On the other hand, organic fertilizers examined (oil cake and animal-manure compost) emitted less CO2 than green manure. However, when these organic fertilizers were co-applied with green manure, their decomposition rates and associated microbial activity increased significantly. This synergetic enhancement can largely be explained by priming effect of boomed microbial population that utilize labile C pools of green manure, and partly by high contents of inorganic N in the organic fertilizers.