Korean Journal of Plant Taxonomy (식물분류학회지)

The Korean Society of Plant Taxonomists (한국식물분류학회)
권호 표지

ITS sequence variations in common ragweed and giant ragweed

돼지풀 및 단풍잎돼지풀의 ITS 염기서열 변이

  • Kim, Young-Dong (Department of Life Science, Hallym University) ;
  • Park, Chong-Wook (School of Biological Sciences, Seoul National University) ;
  • Sun, Byung-Yun (Faculty of Biological Sciences, Chonbuk National University) ;
  • Kim, Ki-Joong (School of Life Sciences & Biotechnology, Korea University) ;
  • Lee, Eun-Ju (School of Biological Sciences, Seoul National University) ;
  • Kim, Sung-Hee (Department of Life Science, Hallym University)
  • Received : 2005.11.24
  • Accepted : 2005.12.14
  • Published : 2005.12.30
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Abstract

Genetic variation of notorious invasive plants, common ragweed (Ambrosia artemisiifolia L.) and giant ragweed (Ambrosia trifida L.) were examined using the internal transcribed spacer (ITS) sequences of nuclear ribosomal DNA. A total of 18 different ITS types were detected from 156 individuals of common ragweed sampled mainly from the southern part of Korean peninsula whereas four types were identified from 46 individuals of giant ragweed. High sequence diversity observed from common ragweed in Korean populations was interpreted as multiple introduction. Genetic recombination was suggested as possible method for the production of some of the ITS types while point mutation was mainly responsible for the origin of the sequence diversity. This study provided some of basic genetic information needed for understanding of the evolutionary process in ragweed during invasion.

국내에 분포하는 대표적 침입외래식물인 돼지풀과 단풍잎돼지풀이 나타내는 유전적 변이양상을 파악하기 위해 국내집단을 중심으로 돼지풀 157개체와 단풍잎돼지풀 46개체로부터 핵 rDNA의 ITS(Internal Transcribed Spacer)지역 염기서열을 분석하였다. 그 결과 돼지풀에서는 총 18개의 ITS 유형이, 단풍잎돼지풀에서는 4개의 유형이 각각 검출되었다. 돼지풀의 경우 각각의 ITS 유형간에는 1bp에서 7bp까지 차이가 나는 것으로 확인되었으며, 단풍잎돼지풀의 경우 각 유형 간에 1bp에서 2bp의 차이가 발견되었다. 돼지풀의 국내집단에서 18개에 이르는 다양한 ITS 유형이 검출되었다는 사실은 이 종이 우리나라에 여러 차례 반복해서 유입했기 때문인 것으로 풀이된다. 한편 일부 ITS 유형은 유전적 재조합에 의해 형성되었을 가능성이 있으며, 각각 한 개체에서만 발견된 12개의 소수 유형들은 점돌연변이 또는 그에 뒤이은 유전적 재조합에 의해 국내에서 독자적으로 기원했을 것으로 추정된다. 본 연구를 통해 침입과정에서 나타나는 돼지풀의 진화적 변화를 이해하는데 필요한 유용한 유전적 기초정보가 확보되었다.

Keywords

Acknowledgement

Supported by : 환경부

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