Bio1b Summer 2008 Plants Lecture 6 Eric Harris Page 1 of 2 Updated on 07/31/08 PLANTS LECTURE 6: THE PLANT BODY I: SHOOTS Reading: 7th ed., 720, 723–728; 8th ed., 746–747, 749–754. A. The archetypal plant: introduction to the shoot & root system B. Shoot System i) Structure: stem, node, internode, leaves, axillary buds ii) Determinate vs. indeterminate growth iii) Shoot Apical Meristem - established in embryogeny - responsible for primary growth (elongation) - leaf primordia & bud primordia - early tissues (protoderm, ground meristem, procambium) iv) Shoot in cross section (monocot vs. dicot) v) Patterns of leaves = phyllotaxis C. Leaf Morphology i) Petiole, blade, base ii) Types: simple, compound – how to distinguish iii) Arrangement of Veins iv) Anatomy epidermis, cuticle, stomata, palisade & spongy parenchyma, trichomes, vascular tissue D. Modifications of the Stem & Leaf i) Stems rhizomes, bulbs, stolons, tubers ii) Leaves tendrils, spines, storage, insect captureBio1b Summer 2008 Plants Lecture 6 Eric Harris Page 2 of 2 Updated on 07/31/08 E. Secondary Growth i) Primary growth = growth in length as a result of apical meristems Secondary growth = growth in width as a result of lateral meristems ii) Lateral meristems (a.k.a. cambia, singular= cambium) Two types: vascular cambium & the cork cambium iii) Origin & function of the vascular cambium Secondary tissues – 2º xylem & 2º phloem Rays Annual rings iv) Monocots lack a vascular cambium v) Cork cambium – periderm, modes of origination Bark, lenticels vi) Consequences of secondary
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