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6 Organs - Root Vasculature and Adaptations

6 Organs - Root Vasculature and Adaptations - Lecture 6...

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Lecture: 6 BioSci 1C Apr.5.07 Plant Organs, Roots
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Roots Vascular Cylinder Composed of tissue differentiated from procambium cells Dicot roots – Central core of primary xylem elements organized into two or more radiating points Monocot roots – Center of root composed of parenchyma (sometimes called pith) – Primary xylem and phloem form in a ring
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Dicot root Monocot root Most dicot and conifer roots have a core of xylem with varying numbers of lobes Most monocot roots have a core of undifferentiated cells surrounded by alternating rings of xylem and phloem
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Vascular Cylinder in roots Xylem cell types – Vessel elements – Tracheids – Parenchyma – Fibers • Phloem cell types - Parenchyma - Fibers - Sieve-tube members - Companion cells
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Vascular Cylinder • Protoxylem – First xylem element to mature – Develops at outer points of xylem – Transports water while root is elongating – Secondary cell wall in shape of annular rings or spirals Provides both strength and elasticity
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