Botany Chapter 5

Botany Chapter 5 - Chapter 5: Roots and Soil Stages of...

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1 Chapter 5: Roots and Soil Stages of roots ± ± First to emerge from seed ± ± Develops from radicle ± Root hairs appear ± Start of: ± Anchoring ± Water and nutrient uptake ± ± Extensive ± ± Deeper; thicker ± Have branch roots ± Dicotyledonous Plants ± ± Adventitious roots from stems ± Shallower ± Monocotyledonous Plants
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2 External root structure ± ± Fewer on roots in dry, hard soil ± Help in uptake ± ± Extension of epidermal cells ± ± Protects apical meristem ± Produced by apical meristem ± Amyloplasts for gravitropism? ± Border cells for protection ± ± Polysaccharide excreted by tip ± From Golgi body ± Lubricate, uptake, decrease dessication, microbe recognition Internal root structure ± ± Produces 1 o tissues ± Protoderm, procambium, ground meristem ± ± Cells mostly get longer ± Increase water in vacuole ± Sieve tubes of phloem specialized ± ± Tissue specialization ± Have root hairs Root hairs ± Extension of epidermal cell (single cell) ± Need epidermal cells to be elastic ± ± Fast growth and worn off quickly ± ± Selective uptake and transport
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3 Tissues ± ± Starch storage ± May have air spaces (aerenchyma) ± Water & nutrient movement to vascular tissue ± Symplastic or apoplastic ± ± Innermost layer of cortex ± Water moves freely in… other things need special passage ± Casparian strip ± Suberin (wax and phenols w/ antiseptic properties) ± Not on side walls Primary vascular system (vascular cylinder) ± ± Meristematic activity ± Makes branch roots ± Makes vascular cambium ± ± Secondary xylem and phloem ± From vascular cambium ± 2 o xylem = wood
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This note was uploaded on 04/18/2008 for the course BIO 1203 taught by Professor Tartur during the Spring '08 term at Dalton State.

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Botany Chapter 5 - Chapter 5: Roots and Soil Stages of...

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