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Overexpression of Ice Recrystallization Inhibition Protein (HvIRIP) from Barley Enhances Cold Tolerance in Transgenic rapeseed plants

HvIRIP 과발현 유채 형질전환체의 내한성 증진

  • Roh, Kyung Hee (Department of Agricultural Biotechnology, National Academy of Agricultural Science, RDA) ;
  • Park, Jong-Sug (Department of Agricultural Biotechnology, National Academy of Agricultural Science, RDA) ;
  • Kang, Han-Chul (Department of Agricultural Biotechnology, National Academy of Agricultural Science, RDA) ;
  • Kim, Jong-Bum (Department of Agricultural Biotechnology, National Academy of Agricultural Science, RDA) ;
  • Jang, Young-Suk (Bioenergy Crop Research Institute, National Institute of Crop Science, RDA) ;
  • Kim, Kwang-Soo (Bioenergy Crop Research Institute, National Institute of Crop Science, RDA) ;
  • Yi, Hankuil (Department of Biological Sciences, Chungnam National University)
  • Received : 2015.07.17
  • Accepted : 2015.08.26
  • Published : 2015.12.31

Abstract

Rapeseed (Brassica napus) is now the second largest oilseed crop after soybean. Cold temperature tolerance is an important agronomic trait in winter rapeseed that determines the plant's ability to control below freezing temperatures. To improve cold tolerance of rapeseed plants, an expression vector containing an Barley Ice recrystallization inhibition protein (HvIRIP) cDNA driven by a cauliflower mosaic virus 35S promoter was transferred into rapeseed plants. Transgenic expression of HvIRIP was proved by southern- and northern-blot analyses. The level of freezing tolerance of transgenic $T_3$ plants was found to be significantly greater than that of wild-type rapeseed plants by freezing assay. Proline accumulation during cold stress was also highly induced in the transgenic rapeseed plants. The transgenic plants exhibited considerable tolerance against oxidative damage induced by cold stress. Our results indicated that heterologous HvIRIP expression in transgenic rapeseed plants may induce several oxidative-stress responsive genes to protect from cold stress.

유채는 월동작물로 내한성이 약해 남부지역에서만 재배가 가능하다. 따라서 재배면적 확대 및 안정적 생산성 확보를 위해 내한성 증진 품종 육성이 절실하다. 본 연구에서는 유채의 내한성을 증진시키기 위해 보리에서 유래한 HvIRIP 유전자를 CaMV35S 프로모터 조절하에서 전신발현되도록 운반체를 제작하였고, 아그로박테리움을 이용하여 유채에 형질전환하였다. Southern 분석을 통해 HvIRIP 유전자가 유채 Genome 안으로 전이 되었음을 확인하였다. 또한 Northern 분석을 통해 $4^{\circ}C$에서 2주간 처리된 유묘에서 HvIRIP 유전자의 발현이 크게 증대되는 것을 알 수 있었다. 본엽 3-4매 전개 유채 형질전환체를 영하 $5^{\circ}C$에서 2일간 저온에 노출한 후 회복여부를 조사한 결과, 대조구는 회복하지 못하고 죽은 반면, 형질전환체는 회복이 정상적으로 이루어졌다. 또한 저온스트레스가 진행되는 동안에 스트레스를 극복하는데 필요한 Proline 함량이 형질전환체에서 크게 증대되는 것이 관찰되었다. 이 외에도 저온스트레스 과정 중에 생성되는 활성산소의 독성을 감소시키는 항산화제 효소인 CAT, SOD 그리고 ADH 활성을 측정한 결과, 대조구에 비해 형질전환체에서 그 함량이 현저히 증가됨을 알 수 있었다. 따라서 이러한 결과를 통해 HvIRIP 유전자가 함유된 유채 형질전환체의 내한성이 증진되었음을 확인하였다.

Keywords

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