Photoperiodic-regulated autumn growth cessation in Populus

##The perennial trees,in contrast to the much more studied annual plants,have to adapt their vegetative growth and development to the sometimes extremely contrasting environmental conditions that occur over the different seasons.The growth cessation of the shoot apical meristem is the first step that trigers plants from active growth to doramcny transition to suvival in harsh winter.In Populus,growth cessation is induced by short-day photoperiod.Recently,the molecular mechanisms of this SD-induced growth cessation are increasingly understood.Insight into these mechanisms will be important for our understanding of how trees will respond to various future global climate scenarios.