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collenchyma

collenchyma. Parenchyma cells. phloem. Vascular bundle. xylem. Plant Tissue Cell Types. Parenchyma primary walls thin and flexible; no secondary walls; large central vacuole; most metabolic functions of plant (chloroplasts)

talulah-taylor
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collenchyma

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  1. collenchyma Parenchyma cells phloem Vascular bundle xylem

  2. Plant Tissue Cell Types • Parenchyma primary walls thin and flexible; no secondary walls; large central vacuole; most metabolic functions of plant (chloroplasts) • Collenchyma unevenly thick primary walls used for plant support (no secondary walls ; no lignin) • Sclerenchyma support element strengthened by secondary cell walls with lignin (may be dead; xylem cells); fibers and sclereids for support

  3. Plant Organ Systems • Dermal (epidermis): single layer of cells for protection • cuticle • Vascular (material transport) • xylem: water and dissolved minerals roots to shoots • tracheids & vessel elements: xylem elongated cells dead at maturity • phloem: food from leaves to roots and fruits • sieve-tube members: phloem tubes alive at maturity capped by sieve plates; companion cells (nonconducting) connected by plasmodesmata • Ground (photosynthesis, storage, support): pith and cortex

  4. Primary Lengthen @ roots/shoots Apical Meristems “pinching back” Secondary Growth in thickness Woody stems Lateral meristems Vascular cambium Cork cambium Primary vs. Secondary

  5. Primary Tissues of Stems • Vascular bundles (xylem and phloem) • Surrounded by ground tissue (xylem faces pith and phloem faces cortex) • Mostly parenchyma; some collenchyma and sclerenchyma for support

  6. Secondary Growth • Two lateral meristems • vascular cambium ~ produces secondary xylem (wood) and secondary phloem (diameter increase; annual growth rings) • cork cambium ~ produces thick covering that replaces the epidermis; produces cork cells; cork plus cork cambium make up the periderm; lenticels (split regions of periderm) allow for gas exchange; bark~ all tissues external to vascular cambium (phloem plus periderm)

  7. Water Potential in Plants YW= ΨP+ΨS ΨS = solute potential/water potential Will always be negative in solutions ΨP = pressure potential rel. to atmosphere

  8. Transport in Plants • Water Potential

  9. Which has more water: air or the leaf? Which is hypotonic? Which has a greater Ψ?

  10. Transpiration • Cohesion • Adhesion • Tension

  11. Stomata Regulation

  12. Source to Sink Pressure flow in Phloem Alternative nutrition methods Carnivorous Plants SPONCH CaK Mg . . . .

  13. Germination • Plants in Motion - Corn germination

  14. Chp 39 – Hormonal Plants • See 38.39 ppt.

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