| Plant growth is regulated by developmental programmes that can be modified by environmental cues acting through endogenous signaling molecules including plant hormones.This volume provides an overview of the biosynthesis, catabolism, perception and signal transduc tion of the individual hormone classes, followed by chapt ers on hormone distribution and transport, and the roles of hormone signaling in specific developmental processes. Particular attention is paid to the regulation of hormone signaling by environmental and developmental cues , sites of hormone m