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Transgenic tobacco with the bacterial merA gene under control of plant regulatory sequences express MerA protein (mercuric ion reductase). These plants survive transplantation to mercury contaminated Georgia soils, while wild type control plants all died. Even at the highest concentrations of mercury tested (500ppm) 100% of the transgenic plants went on to make full sized tobacco plants and set normal amounts of seed. Plants lagged in their growth initially at the highest merucry concentrations (i.e., this photo was taken a few weeks after transplantation and the lag at 500 ppm is clear). |
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