Production, amplification and systemic propagation of redox messengers in plants? The phloem can do it all!

Summary Rapid long‐distance signalling is an emerging topic in plant research, and is particularly associated with responses to biotic and abiotic stress. Systemic acquired resistance ( SAR ) to pathogen attack is dependent on nitric oxide ( NO ) and reactive oxygen species ( ROS ) such as hydrogen peroxide (H 2 O 2 ). By comparison, systemic wound responses ( SWR s) and systemic acquired acclimation ( SAA ) to abiotic stress encounters are...