If you look in the parts registry under promoters
You can find heavy metal induced promoters. Throw another gene downstream of that, like GFP or maybe a lux operon, and you could have bacteria or yeast that would glow in the presence of the heavy metal. Spray it over a field or contamination site and check for the presence of your expressed protein. Easier said than done though.
You could also make it work in plants like you say, though it would probably take a lot of work.
One thing that would be very important is the concentration at which the promoter is induced. If it is SUPER sensitive, than your biological alarm system might be making you think your soil is more contaminated than it is....or it's still at safe levels, but enough to turn on the genes.
I think living bio-sensors are probably one of the coolest things one could design with the biological parts, and they could have a lot of commercialization potential I'd think.
Too bad none of us can get parts though.
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