Week 8 - Plant Transport Systems Flashcards
What is the apoplastic route?
Everything external to the plasma membrane.
Cell membranes, interstitial space, etc
What is the symplastic route?
Cytosol of living cells and plasmidimata that connects cells
How is the pressure potential relevant to long distance transport of water
Pressure potential moves up against the force of gravity bc leaf tissue have very little dtuff
What is the casparian strip?
prevents ions from staying in the apoplastic route. They have to go through the plasma membrane
What is guttation?
Morning dew. Generated by pressure gradient.
ONLY IN HERBATIOUS PLANTS
What are the three conditions to have transporstional water loss in trees?
- Stomata must be open
- Temps must be high enough to allow evaporation of water
- Air must not be saturated with water vapor
Name three sugar sinks
Fruit
Flower
Root
What is translocation?
Moving sugar sap.
- Loading of sugar
- Uptake of water
- Unloading of sugar
- Recycling of water
BIDIRECTIONAL
At the base of the petiole (where petiole and stem meet) we find what?
Axillary bud
What is apical meristem responsible for?
Primary growth and lengthening plant shoot and root system
What is lateral meristem responsible for?
Secondary growth that leads to the diameter growth of stems and roots
How is water transported through the xylem?
Negative pressure. Water loss in the leaves, increasing surface tension which pulls up more water by hydrogen bonds
How is sugar sap transported in the phloem
Sugar sap accumulates outside the sieve tube element and decreases the solute potential so water goes IN and pressure INCREASES. This pressure pushes sap to sugar sibkd
