 However, the stomata of plant 2, with half its roots sharing Pot B with half the roots of the first plant, also closed within 15 minutes of mannitol addition to Pot A.This observation suggested that a signal from the drought-induced roots in Pot A travelled to the non-stressed roots of the same plant, which caused them to release a drought signal into Pot B's soil.Stomatal closing at the leaves of the other plant neighbors in the remaining pots was also measured, albeit at a longer time after the mannitol treatment in Pot A.