PLNT_S 2125 Lecture Notes - Lecture 2: Anthocyanin, Stoma, Urtica Dioica
Document Summary
1/27/15: dermal, covers the surface of plants, continuous protective layer of cells, outer surface of roots and shoots. Waxy" cutin on shoots and some leaves sometimes is formed. In general is one layer thick and doesn"t contain chloroplasts/chlorophyll: sometimes other pigments, mainly anthocyanin filter out dangerous light, like uv, stomata. Gas exchange/transpiration: co2, o2, h2o vapor. Complex parts: stomatal pore, guard cells, regulate stomata, subsidiary cells. May be thousands on a cm2 on a leaf, or very few: bulliform cells. Large water filled cells: occur in groups between the ridges formed by leaf veins, much bigger than most dermal cells, control leave rolling in gasses. In water deficit, they shrink, curling the leaf to conserve water: minimizes stoma exposure to cut back on water loss, trichromes. Specialized epidermal cells in the form of hairs. Range in size from microscope to very noticeable.
