Quote:Currently, the plants can change colour within hours - and are 100 times more sensitive to chemical signals than a dog's nostrils - but they will need to respond within seconds or minutes to be truly useful as green watchdogs.
This reminds me of another sensitive plant called Mimosa pudica.
The leaves of the plant fold up when you touch them and it is not an engineered plant unlike the tobacco bomb detecting plants.
http://www.youtube.com/watch?v=g0LFBM3hOLs