Dormancy cycling at the shoot apical meristem: Transitioning between self-organization and self-arrest

▶ Bud dormancy and cold acclimation are induced by short photoperiod in many trees. ▶ Chilling (+5 °C) removes dormancy but simultaneously improves freezing tolerance. ▶ In dormant meristems morphogenesis is put on hold by obstruction of cell signaling. ▶ In dormancy release 1,3-β-glucanase-enzymes remove callose at plasmodesmata. ▶ Lipid bodies may assist in transporting 1,3-β-glucanase enzymes to plasmodesmata.