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Chapter 12: Transport Processes (Water Potential (Cells and Water Movement…
Chapter 12: Transport Processes
Water Potential
Cells and Water Movement
water moves to a more negative potential
symbol ψ
Pressure potential
ψp
osmotic potential
megapascals (MPa)/bars
matric potential
ψm
Incipient plasmolysis
Diffusion, Osmosis, and Active Transport
membrane types
completely impermiable
selectively permeable
Freely permeable
aquaporins
protein channels
Osmosis
molecular pumps
Diffusion
active transports
Short-Distance Intercellular Transport
Motor Cells
joint cells
Venus' flytrap
Transfer Cells
smooth walls
outgrowth
finger-like
ridge-like
Guard Cells
potassium ions
symplast
all protoplasm of one plant
Long-Distance Transport: Xylem
Water Transport Through Xylem
cohesion-tension hypothesis
transstomatal transpiration
transcuticular transpiration
Control of Water Transport by Guard Cells
atmospheric dryness
Properties of Water
adhesive
cohesive
soil adhesion
Long-Distance Transport: Phloem
pressure flow hypothesis
sources
water
nutrients
STM/CC complex
conducting cells
companion cells
Sinks
phloem sap
P-protein
callose
