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Plant. Structure and Function. Angiosperm structure. Root system depends on shoot for organic molecules Shoot system depends on root for water and nutrients Organ vs. tissue. Plant tissues. Nonwoody plants: Epidermis Wood plants: Periderm replaces epidermis

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plant

Plant

Structure and Function

angiosperm structure
Angiosperm structure
  • Root system depends on shoot for organic molecules
  • Shoot system depends on root for water andnutrients
  • Organ vs. tissue
plant tissues
Plant tissues
  • Nonwoody plants: Epidermis
  • Wood plants: Periderm replaces epidermis
  • Water/nutrient absorption vs. cuticle
  • Root and stem vascular tissue: stele
  • Ground tissue INTERNAL to vascular: pith
  • Ground tissue EXTERNAL to vascular: cortex
  • Protoplast: Cell contents EXCLUDING the cell wall
slide6
5 – Leaf structure (688)

6- Stem structure (687)

7 - Root structure (685)

1 – Leaf form follows function

2 – Stem form follows function

3 – Root form follows function

For your assigned organ, either list examples of form follows function OR describe the basic structure of it (including tissues and difference between monocot and eudicot). Be prepared to explain

plant growth
Plant growth
  • Indeterminate vs. determinate growth
  • Annuals vs. biennials vs. perennials
  • Apical meristems  primary growth
  • Lateral meristems  secondary growth
  • When does growth happen?
plant concept map
Plant concept map
  • Start your concept map with the following categories
  • Think carefully how you want to integrate the diagrams. They can be hand drawn or cut out from the internet. Many terms can be used to label diagram (still need to be connected to 2 other terms with connecting phrase)
  • Over the weekend, write out terms, and begin finding connections between terms

Plant

Reproduction Structure Regulation transport

transport regulation root pressure
Transport regulation: Root pressure
  • Aquaporins: Increase the RATE of osmosis
  • Cell membrane vs. vacuolar membrane (tonoplast)
  • Symplast vs. apoplast
root pressure
Diffusion is only efficient over VERY small distances (less than 100 μm)

Bulk flow (driven by pressure)

Pathway of water and minerals

Guttation:

Increasing SA: Root hairs and mycorrhizae

Root pressure

Root pressure can only push water up 2-3 m. What mechanism delivers water to the top of a Redwood tree?

transpiration
Push (+ Ψ) or pull (- Ψ)?

Ψ outside leaf < Ψ inside leaf

Direction of water vapor?

TRANSPIRATION!

Transpiration

How could this allow water to move upward?

Film lining air spaces curves as vapor leaves

↑ radius  ↓ Ψ

transpiration cohesion
Transpiration-Cohesion
  • Water pulled toward airspace film, which pulls on COLUMN of water molecules (cohesion and adhesion)
transpiration lab instructions
Transpiration lab instructions
  • Place plant into tubing UNDER water. Check to ensure there are no air bubbles. Use petroleum jelly to seal
  • Prediction, interpretation of conditions
  • Why change units to mL/m2?
  • Mark which data must be filled in
stomatal opening closing
Stomatal opening/closing
  • Photosynthesis/transpiration compromise
  • Sunny, warm, windy days increase evaporation, why?
  • Adaptations to water loss: Cuticle, biochemical pathways (xerophytes)
slide19
Light: Stimulates membrane proton pumpsK+ accumulation Osmosis makes guard cells turgid Stomata open
  • Depletion of CO2 stomata open
  • Circadian rhythm,
double fertilization
Double fertilization
  • 1 sperm  egg (zygote- 2n)
  • 1 sperm  2 polar nuclei (3n)  endosperm
seed structure
Seed structure
  • Ovule  seed
  • Ovary  fruit (controlled by hormones)
  • Simple (peach, pea pod, nut) vs. aggregate (raspberry) vs. multiple (pineapple)
plant hormones
Plant hormones
  • Know table on pg. 794. Auxin, cytokinins, gibberellins, abscisic acid, ethylene