BOT 1200 Lecture Notes - Taxus Brevifolia, Vascular Cambium, Pinus Contorta

• School: University of Guelph
• Department: Botany
• Course: BOT 1200

Document Summary

Stems have numerous roles in plants: woody stems have three types of meristematic tissue (regions of active cell division) Tree stems contain a lateral meristem known as vascular cambium. From the coalescence of vascular bundles, organized in a concentric ring. Xylum cells on the inside, and phloem cells on the outside. The first year of growth causes the meristematic tissue within the bundle, known as fascicular cambium to combine. it will then form rings of secondary xylem and secondary phloem, which will push the inner rings out. A tree stem is made up of wood, and bark, the vascular cambium would be at the interface between the newest layer of wood and bark. The inner bark is involved in the transport of organic ingredients. Also where a lot of medicinal compounds are found. Water loss due to the large surface area. Cork cells are reinforced with polymers, like lignin, which provides hardness.