콩의 Pathogenesis-Related 10 유전자를 이용한 내염성 벼 형질전환 계통 개발
Development of Salt-Tolerant Transgenic Rice Using Soybean PR10 Gene
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콩의 PR10 유전자(GmPR10)를 벼에 형질전환하여 GmPR10전이 유전자의 발현 정도와 내염성 관련 형질의 반응 사이의인과관계를 조사하여 염 스트레스에 대한 GmPR10 생리적기능을 분석하고 내염성 유전자원을 개발하였다. 1. 전이 유전자는 형질전환 계통에 따라 게놈 내에 1 ~ 6개의 사본이 도입되었고, 선발된 8개의 형질전환 계통 모두에서전이 유전자가 발현되었으며, 발현 정도는 계통에 따라 변이를 보였다. 2. T1세대 2계통의 형질전환 식물체와 비 형질전환 식물체에 125mM NaCl을 시간별로 처리한 결과, 전이 유전자GmPR10의 전사체 검출양은 2계통의 형질전환체에서 모두염처리 6시간까지 증가하였고, 12시간 이후에는 감소하였다. 3. 세포의 전해질 누출율은 형질전환체가 비 형질전환체에비해 낮았고, 뿌리가 잎보다 낮았다. 또한, 전이 유전자 전사체의 검출량이 높을수록 전해질 누출율은 낮았다. 4. NaCl 용액에서의 생육 정도는 형질전환체가 비 형질전환체보다 현저히 양호하였으며 GmPR10 전이 유전자의 발현이 높을수록 생육 정도가 더 좋았다. 결론적으로 GmPR10 은 내염성을 증진시키는 기능이 있으며, GmPR10 전이유전자의 발현이 높은 계통은 내염성 벼 육성용 소재로 이용할 수 있을 것으로 평가된다.
Abstract
This study was conducted to understand the role of soybean pathogenesis-related 10 (GmPR10) gene in salt tolerance and to develop salt-tolerant rice using GmPR10 cDNA. GmPR10 transgene was expressed constitutively in the shoot and root of the T1 transgenic rice plants. Interestingly, however, the levels of the transgene expression were increased temporally up to over four- to five-fold in the shoot and root by 125 mM NaCl treatment, peaking at six hours after the treatment and decreasing thereafter. Electrolyte leakage of leaf cells under 125 mM NaCl treatment was lower in all the transgenic lines than in the control variety, Dongjin-byeo. Ability of seedlings to recover from 125 mM NaCl treatment for two weeks was higher in the transgenic plants than in the control plants. These results demonstrated that GmPR10 had function to increase cell integrity and promote growth under the saline stress imposed by NaCl. The transgenic line GmPR10-3 which showed highest ability to recover from the saline stress could be used as a potential source for salt tolerance in rice breeding programs.
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