Plants 'can think and remember'

[The scientists] discovered that when light stimulated a chemical reaction in one leaf cell, this caused a "cascade" of events and that this was immediately signalled to the rest of the plant by via specific type of cell called a "bundle sheath cell". What was even more peculiar, Professor Karpinski said, was that the plants' responses changed depending on the colour of the light that was being shone on them. "There were characteristic [changes] for red, blue and white light," he explained.

-- from a BBC report