Expression of a β-glucosidase gene results in increased accumulation of salicylic acid in transgenic Nicotiana tabacum cv. Xanthi-nc NN genotype

Abstract

A β-glucosidase gene (bglA) from Butyrivibrio fibrisolvens H17c was cloned into the binary vector pGA482 under the control of the 35S Cauliflower Mosaic Virus (CaMV) promoter. A second construct was generated for accumulation of the bglA gene product in the vacuole of transformed tobacco plants. Reverse transcription – polymerase chain reaction analysis demonstrated that the bglA gene was expressed in 71% of cytosol-targeted and 67% of vacuole-targeted transgenic tobacco T1 plants. T1 transgenic plants (pGLU100 and pGLU200) exhibited elevated levels of free salicylic acid (SA) with a concomitant significant decrease in the level of glucosylsalicylic acid (GSA) compared to the untransformed tobacco plants and tobacco plants transformed with the empty vector (pGA482). Following inoculation with Tobacco Mosaic Virus (TMV), lesion area was 51% smaller in pGLU100 plants and 60% smaller in pGLU200 plants compared to inoculated untransformed and negative control plants.

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Acknowledgements

We thank Ms. Talline Robadey and Dr. Wendy Tan for their assistance in the gene-sequencing project.

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Correspondence to Alexander Enyedi.

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Communicated by D. A. Somers

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Yao, J., Huot, B., Foune, C. et al. Expression of a β-glucosidase gene results in increased accumulation of salicylic acid in transgenic Nicotiana tabacum cv. Xanthi-nc NN genotype. Plant Cell Rep 26, 291–301 (2007). https://doi.org/10.1007/s00299-006-0212-8

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Keywords

  • Salicylic acid
  • Tobacco
  • Tobacco mosaic virus
  • β-glucosidase