BIO-0014 Lecture 13: Water's role in the development of plants

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1. Cells in plants
a. Water flowing through the cells
i. Diffusion
1. Very resistant pathway
2. Only a few water molecules can get through
3.
ii. Aquaporin
1. Can increase or decrease protein channel
a. Gene expression
2.
3. Allows water molecules to pass through a channel into the
cytoplasm
4. Can also regulate the time that an aquaporin is in the open or
close position
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a.
b. Change in timing
c. Quickest way to increase uptake of H2O in a cell
iii.
iv.
1. Atmosphere has extremely negative water potential compared to
soil, roots, and even leaves
2. Strongest pull of water up the plant
a. Not being pushed, being pulled off the leaf by evaporation
b. Pulls more water up through the plant
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