Research in Plant Disease (식물병연구)

The Korean Society of Plant Pathology (한국식물병리학회)
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Molecular Characterization of Small-Spored Alternaria Species

소형의 포자를 형성하는 Alternaria 균류의 분자생물학적 특징

  • Kim, Byung-Ryun (Crop Environment and Biotechnology, National Institute of Crop Science, RDA) ;
  • Park, Myung-Soo (Department of Applied Biology, College of Agriculture and Life Sciences, Chungnam National University) ;
  • Cho, Hye-Sun (Department of Applied Biology, College of Agriculture and Life Sciences, Chungnam National University) ;
  • Yu, Seung-Hun (Department of Applied Biology, College of Agriculture and Life Sciences, Chungnam National University)
  • 김병련 (농촌진흥청 작물과학원) ;
  • 박명수 (충남대학교 농업생명과학대학 응용생물학과) ;
  • 조혜선 (충남대학교 농업생명과학대학 응용생물학과) ;
  • 유승헌 (충남대학교 농업생명과학대학 응용생물학과)
  • Published : 2005.06.01
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Abstract

To establish taxonomic system of morphologically similar species of small-spored Alternaria, phylogenetic analysis of internal transcribed spacer (ITS 1, ITS 2 and 5.8S rDNA) and mitochondrial small subunit (mt SSU) rDNA sequences and URP-PCR fingerprinting analysis from 11 species ofAlternaria were performed. Phylogenetic analysis of ITS and mt SSU rDNA sequences revealed that 10 out of 11 species of the smallspored Alternaria were phylogenetically identical with a bootstrap value of 100%. A. infectoria only was phylogenetically differentiated from the other species. The results suggest that the 10 small-spored Alternaria species are very closely related evolutionally and the markers can not be used for differentiation of the smallspored Alternaria species. URP-PCR fingerprinting analysis from eleven species of smallspored Alternaria using 10 URP primers showed that it was possible to differentiate the species, although genetic similarities were found among the species. The Alternaria sp. from common pokeweed could be distinguished from other species by URP-PCR analysis, and it was considered as a new species. A. infectoria could be easily distinguished from the other 10 species by phylogenetic analysis of ITS and mt SSU rDNA sequences and the URPPCR fingerprinting analysis.

이 연구는 Alternaria속 균류 중에서 분생포자의 형태가 유사하여 분류, 동정이 매우 어려운 소형의 포자를 형성하는 11종의 Alternaria의 종간 유연관계와 분류체계를 확립하기 위하여 공시균들의 ribosomal DNA의 ITS 및 미토콘드리아 small submit 영역의 염기서열 분석, 그리고 URP primer에 의한 핵산지문분석을 실시하였다. 소형의 포자를 형성하는 11종 Alternaria속의 rDNA internal transcribed spacer(ITS) 영역과 미토콘드리아 small submit rDNA 의 염기서열을 분석하였던 바 A. infectoria를 제외한 10종의 Alternaria에서 100%의 상동성을 나타내었다. 이는 공시한 10종의 Alternaria가 유전적으로 매우 근연의 관계에 있음을 나타내며, 이 marker는 공시균들의 종구분에 이용할 수 없음을 나타내는 것이다. URP primer 10종을 공시하여 소형의 포자를 형성하는 Alternaria 균류의 핵산지문분석을 실시한 결과, 개개의 primer 로는 종간의 구분이 불가능하였으나 여러개의 primer를 종합하여 UPGMA분석을 실시할 경우 비록 종간 유사도는 높았디만 각각의 종은 독립된 cluster를 형성하여 종간 구별이 가능하였다. 자리공에서 분리한 Alternaria sp.는 URP-PCR 핵산지문 분석 결과 다른 Alternaria 종들과 차이가 인정됨으로 이 균은 미기록인 신종의 Alternaria로 사료되었다. A.infectoria는 다른 Alternaria 종들과 ITS 분석 및 URP-PCR 핵산지문분석에서 큰 차이를 보임으로서 뚜렷이 구별되는 종으로 판단되었다.

Keywords

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