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Chapter 18 Plant Anatomy - Lecture 16 Chapter 18 Leaves...

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Lecture 16: Chapter 18: Leaves: Structure and Development Overview Introduction Leaf morphology Leaf histology o Epidermis, mesophyll, vascular system Leaf development Abscission (again) Summary Leaf Introduction The leaf is generally the main photosynthetic organ of the plant and is highly variable in shape, structure and specific function. Photosynthetic leaves are usually green. Leaves may be variously modified to fulfill other functions for the plant besides photosynthesis. Often, these leaves are non-green and subtend other structures; are called bracts. Their development is the same as true leaves. Leaf morphology Review! Most leaves consist of a more or less broad expanse called a “blade” attached to the main shoot by a stem-like portion called a “petiole.” Just above the point of attachment of the leaf to the shoot is an axillary bud. Can have variation in: simple vs. compound leaves, attachment pattern to
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