BIOL 2242 Lecture Notes - Lecture 15: Meristem, Auxin, Monocotyledon

• School: University of Manitoba
• Department: Biological Sciences
• Course: BIOL 2242
• Professor: Isobel Waters

Document Summary

General functions of stems: conducts water, minerals, organics between roots and leaves, supports and orientates leaves in optimal position for photosynthesis ( and flowers for sexual reproduction, storage. Short-term in all plants; long-term in woody species: metabolism. Various, including hormone production (especially auxin: note: socialized functions of stems will be covered in leaf topic) Shoot tip: more complex zonation than root because lateral appendages (leaves, axillary buds), arise at tip, are exogenous in origin, elongation occurs in many internodes at same time. Slows down with increasing distance from tip: differentiation in many locations at same time. Due to developing leaf and bud primordial. Shoot apical meristem (sam: terminal (no shoot cap) Leaf primordial surround sam and provide limited protection versus hazards e. g. , desiccation: but sam very vulnerable to herbivory, frost, etc, cell division occurs in sam and primary meristems in both axis and primordial. Seperated by elongating tissues in internodes, plus leaf trace gap.