Cloning of Molecular Marker for Cultivar Protection and Transfer to Nicotiana tabacum L.

품종보호를 위한 분자 마커의 Cloning 및 담배로의 전이

This study was conducted to provide a basic system to develop a molecular marker for plant cultivar protection using a recombinant DNA technology. Using Nicotiana tabacum L. plants, the potentiality in the utilization of the developed marker was examined. After homology test with several plant genomes, mouse adenosine deaminase (ADA) gene was selected as DNA source of a molecular marker for cultivar protection. As a result of the digestion of ADA gene with BamHI and Pst I, six DNA fragments were obtained, and 513 bp DNA fragment among them was selected as a possible DNA marker for cultivar protection. Selected 513 bp DNA fragment was efficiently inserted into pBI101 plasmid vector for plant transformation by using phagemid vector pBluescript II SK (+/-) as an intermediate vector. The recombinant pBI101, carrying 513 bp DNA fragment, possible markers for cultivar protection, was transformed into A. tumefaciens LBA4404. Nicotiana tabacum was transformed with A. tumefaciens LBA4404 having the recombinant pBI101 and was confirmed the transfer of 513 bp DNA fragment, a possible molecular marker for cultivar protection.

새로 육성된 품종의 보호를 위한 분자마커를 대상 작물에 전이시키는 체계를 확립하고자 본 실험을 실시하였다. 식물에서는 전혀 존재하지 않는 mouse adenosine deaminase(ADA) gene으로부터 분자마커로 활용 가능한 크기의 DNA 단편을 획득하고 이를 pBI101에 삽입하여 chimeric gene을 만들었다. 분자마커를 포함하는 형질전환된 담배를 획득하기 위해 A. tumefaciens LBA4404를 이용하여 형질전환을 실시하였다. 담배 절편체에서 형질전환된 신초를 얻기 위해 BAP $1.5mg{\cdot}L^{-1}$, kanamycin $50mg{\cdot}L^{-1}$과 cefotaxim $200mg{\cdot}L^{-1}$이 혼용된 MS배지에서 선발하였으며 신초 발생후 kanamycin의 농도를 2배, 4배로 증가시켜 chimeric gene이 완전하게 전이되어 저항성을 가진 8개체를 얻었다. 항생제에 의해 선발된 8개체를 분자마커 primer로 PCR분석하여 분자마커가 식물체의 genome내로의 전이를 확인하였다.