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Unformatted text preview: Roots and Mineral Nutrition Chapter 35 Roots Anchors plant securely in soil Absorbs water and dissolved minerals for transport through plant (xylem) Starch and glucose storage (phloem) Opportunistic relationships: Mycorrhizae facilitate root uptake of essential minerals Rhizobial bacteria fix N2 in roots of leguminous plants Taproot System Main root formed from the radicle (embryonic root) in the seedling Lateral roots; can become large and produce other roots Reach far into soil to obtain deeply located water eudicots; dandelion, some gymnosperms Fibrous Root System Found in plants with short lived embryonic roots In shallow soil onions, crab grass Adventitious roots of same size developing from end of stem Branching lateral roots Plant Tissue Systems Primary Root Tissue System Dermal: epidermis, no cuticle to prevent root hairs and reduce absorption cellulose in cell walls absorbs water ground tissue: parenchyma (amyloplasts) no supporting collenchyma; develop sclerenchyma as mature Intercellular spaces for water uptake and aeration...
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This note was uploaded on 02/11/2010 for the course BIO 01-119-10 taught by Professor D'arville during the Spring '09 term at Rutgers.
- Spring '09