Expression of a beta-glucosidase gene results in increased accumulation of salicylic acid in transgenic Nicotiana tabacum cv. Xanthi-nc NN genotype.
A beta-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 T(1) plants. T(1) 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.
Yao
Jiqiang
J
Department of Biological Sciences, Western Michigan University, Kalamazoo, MI 49008, USA.
Huot
Bethany
B
Foune
Catherine
C
Doddapaneni
Harshavardhan
H
Enyedi
Alexander
A
D015870:Gene Expression; D005838:Genotype; D010935:Plant Diseases / Q000821:virology; D018515:Plant Leaves / Q000235:genetics / Q000378:metabolism / Q000821:virology; D030821:Plants, Genetically Modified; D020133:Reverse Transcriptase Polymerase Chain Reaction; D020156:Salicylic Acid / Q000378:metabolism*; D014026:Nicotiana / Q000145:classification / Q000235:genetics* / Q000378:metabolism*; D014027:Tobacco Mosaic Virus; D001617:beta-Glucosidase / Q000235:genetics* / Q000378:metabolism*
D001617:beta-Glucosidase; D020156:Salicylic Acid