• Plant Biotechnology Reports
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• 제4권1호
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• pp.75-83
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• 2010

Glycine betaine has been reported as an osmoprotectant compound conferring tolerance to salinity and osmotic stresses in plants. We previously found that the expression of betaine aldehyde dehydrogenase 1 gene (OsBADH1), encoding a key enzyme for glycine betaine biosynthesis pathway, showed close correlation with salt tolerance of rice. In this study, the expression of the OsBADH1 gene in transgenic tobacco was investigated in response to salt stress using a transgenic approach. Transgenic tobacco plants expressing the OsBADH1 gene were generated under the control of a promoter from the maize ubiquitin gene. Three homozygous lines of $T_2$ progenies with single transgene insert were chosen for gene expression analysis. RT-PCR and western blot analysis results indicated that the OsBADH1 gene was effectively expressed in transgenic tobacco leading to the accumulation of glycine betaine. Transgenic lines demonstrated normal seed germination and morphology, and normal growth rates of seedlings under salt stress conditions. These results suggest that the OsBADH1 gene could be an excellent candidate for producing plants with osmotic stress tolerance.

• 한국자원식물학회지
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• 제18권1호
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• pp.15-21
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• 2005

염류내성 식물은 염류농도의 변화에 따라 세포내의 삼투압을 유지하기 위한 화합물을 합성하는 기작을 가지고 있는데 이런 화합물은 주로 proline, glycine, betaine, polyols, sugar등으로 체내에 축적함으로서 고농도의 염류에 견디는 것으로 알려져 있다. Betaine은 미생물에서 2단계 반응을 통해 choline에서 합성되는데, 첫단계는 choline dehydrogenase (CDH)에 의해서 촉매되고(Bet A gene), bet B 유전자의 산물인 betaine aldehyde dehydrogenase(BADH)에 의해 수행된다. 본 실험에서는 Bet A, Bet B 유전자를 아그로박테리움에 도입하여 새로운 conjugants 2 종을 획득하였으며 (Agrobacterium tumefaciens MP90/pBet A, Agrobacterium tumefaciens MP90/pBet B), 먼저 재조합된 binary vector가 식물에서 발현 및 형질 전환되는지 여부를 조사하기 위해서 이미 담배에 형질전환을 시켰으며, 형질전환된 담배에서는 ,고농도의 kanamycin배지에서 생장이 가능하였고, PCR에 의하여 NPT II, Bet A, Bet B gene를 조사한 결과 담배 유식물체 모두 band가 형성되어 형질전환체임을 확인할 수 있었다. 인삼에 Beth, BetB gene의 도입은 1M의 mannitol이 함유된 식물호르몬 무첨가 MS 배지에서 단일배 발생방법에 형질전환체를 획득하였으나, 형질전환체의 발생빈도$(12\%)$가 매우 낮았다.

• Plant Biotechnology Reports
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• 제5권1호
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• pp.71-77
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• 2011

Drought and salinity are the most important abiotic stresses that affect the normal growth and development of plants. Glycine betaine is one of the most important osmolytes present in higher plants that enable them to cope with environmental stresses through osmotic adjustment. In this study, a betaine aldehyde dehydrogenase (BADH) gene from spinach under the control of the stress-induced promoter rd29A from Arabidopsis thaliana was introduced into potato cultivar Gannongshu 2 by the Agrobacterium tumefaciens system. Putative transgenic plants were confirmed by Southern blot analysis. Northern hybridization analysis demonstrated that expression of BADH gene was induced by drought and NaCl stress in the transgenic potato plants. The BADH activity in the transgenic potato plants was between 10.8 and 11.7 U. There was a negative relationship (y = -2.2083x + 43.329, r = 0.9495) between BADH activity and the relative electrical conductivity of the transgenic potato plant leaves. Plant height increased by 0.4-0.9 cm and fresh weight per plant increased by 17-29% for the transgenic potato plants under NaCl and polyethylene glycol stresses compared with the control potato plants. These results indicated that the ability of transgenic plants to tolerate drought and salt was increased when their BADH activity was increased.