Do plants act like computers?

From Nature: Leaves appear to regulate their 'breathing' by conducting simple calculations.

Plants appear to 'think', according to US researchers, who say that green plants engage in a form of problem-solving computation. David Peak and co-workers at Utah State University in Logan say that plants may regulate their uptake and loss of gases by 'distributed computation' - a kind of information processing that involves communication between many
interacting units ... LINK