Characterization of the Acetolactate synthase (ALS) gene and Molecular Assay of Mutations Associated with Sulfonylurea Herbicide Resistance of Monochoria vaginalis

물달개비의 Acetolactate synthase (ALS) 유전자의 특성과 Sulfonylurea 제초제 저항성과 관련 돌연변의 분자생물학적 접근

  • 박태선 (국립식량과학원 벼맥류부 벼육종재배과) ;
  • 박홍규 (국립식량과학원 벼맥류부 벼육종재배과) ;
  • 구본일 (국립식량과학원 벼맥류부 벼육종재배과) ;
  • 김영두 (국립식량과학원 벼맥류부 벼육종재배과) ;
  • 고재권 (국립식량과학원 벼맥류부 벼육종재배과) ;
  • 이인용 (국립농업과학기술원 농약안정성부 농약평가과) ;
  • 박재읍 (국립농업과학기술원 농약안정성부 농약평가과)
  • Published : 2009.12.31


This research aims to contribute the characterization of acetolactate synthase (Ec; ALS) and the resistance mechanism by sequence analysis of ALS gene of the sulfonylurea-resistant and -susceptible Monochoria vaginalis. The ALS gene was obtained from susceptible (S) and resistant (R) M. vaginalis to sulfonylurea herbicides (SUs). The 815 bp the fragment and the genomic DNA sequence coding for acetolactate synthase (ALS) of S and R biotypes of M. vaginalis were cloned and sequenced. Nineteen clones were divided greatly into 4 groups as result of sequencing. The first group was not difference to S type, the second group was amino acid of P197S which found point mutations causing substitution of serine for proline at amino acid 197, the third group was observed greatly other part of 6 places than group 1, and the fourth group appeared the intergrade of group 1 and 3. Therefore, it could be assumed what ALS gene of various types can be one plant. The peptide of the 13 amino acid Domain A region for ALS genes from R biotype of M. vaginalis differed from that of the S biotype by one base substitution at proline codon of Domain A. It could also be confirmed that point mutation of serine for proline at amino acid 197.

본 연구는 한국에서 발생하고 있는 설포닐우레아계 제초제 저항성 및 감수성 물달개비의 ALS 염기서열 분석에 의한 ALS 유전자의 특성과 제초제 저항성 메카니즘을 구명하기 위하여 실시하였다. 감수성 및 저항성 두 계통의 biotype에서 815개의 염기서열을 분석하였다. 분석된 염기서열에서 감수성 biotype으로부터 4개 clone, 저항성 계통으로부터 15개 clone, 총 19개의 clone들을 크게 4 group으로 분류할 수 있었다. 첫 번째 group은 저항성 및 감수성 biotype의 ALS 유전자 염기서열이 차이가 없었으며, 두 번째 그룹은 아미노산 197번째의 proline이 DNA의 점돌연변이(point mutation)에 의해 serine으로 변화된 부분이다. 세 번째 group은 6곳에서 점돌연변이에 의한 아미노산치환이 발생하였으며, 네 번째 group는 첫 번째 group과 세 번째 group 중간적 특성으로 3곳에서 염기서열 점돌연변이에 의해 아미노산 치환이 있었다. 따라서 하나의 물달개비 식물체에서 여러 가지 형태의 ALS 유전자가 존재할 수 있으며, 물달개비 저항성 biotype의 ALS 유전자는 Domain A 부분에 있는 아미노산 197번째 proline이 염기서열 변화에 의해 serine으로 돌연변이 되었다.


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