Jim Bidlack - BIO 5354/4354 PLANT ANATOMY Lecture 8 - Cell Types & Tissues I. Where do all the different types of cells come from (focus on stems)? A. Meristems 1. Apical meristems a) Shoot tips b) Root tips **** apical meristems are the source of all other meristems **** **** apical meristems form the three primary meristematic tissues **** 2. Primary meristems 1. Protoderm - gives rise to dermal (epidermis) tissue (outermost cells) 2. Ground meristem - gives rise to ground tissue (i.e., parenchyma, collenchyma, and sclerenchyma) 3. Procambium - gives rise to vascular tissue (xylem & phloem) XYLEM PHLOEM Procambium Protoderm EPIDERMIS Meristematic Cells Ground Meristem PARENCHYMA SCLERENCHYMA COLLENCHYMA Chlorenchyma (photosynthetic) Storage (starch) Aerenchyma (air) Sclerified (support) II. Tissue types and their cells (focus on stems) A. Dermal (epidermis) 1. Usually a single superficial layer of cells - epidermal cells 2. Covers the primary tissues 3. Outer surface of cells contain cutin - a waxy substance impermeable to water
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