This view is supported by recent findings indicating that communication is more effective between branches that are genetically identical than between branches that are genetically different. Nevertheless, it was reported that resistance-inducing volatiles of lima bean move over distances at which most leaves that can receive the signal still belong to the same plant [25]. Therefore, VOC signals that are responsible for communication between individuals are also required for coordination among branches within a single plant [7,24,32]. Future studies should provide considerable insight into the factors that enable a volatile communication system in individual plants and their population.