Plant water relation; Chapter 9

ability of water to move through the membrane.

• *water inside cells makes it turgid
• *lose/gain water across cell membrane and vacuole
• *cell wall remains the same "up to a point"

-specialized osmosis in plant cells

-water loss causes plants to become "flaccid or wilted"

1. Soil > Diffusion> Root

• 2. Epidermis> Endodermis> Xylem
• * 3 types
• 3. Root > stem > leaf > air
• * cohesion-tension theory

Soil (outside of root) > Diffusion > Root (epidermis/root hairs)

• movement of water from higher to lower concentration
• *reaches equilibrium eventually

*Outside of root to the Center of the root*

-either by symplasty or apoplasty

-move water and nutrients across cell membrane

-from higher and lower concentration

-water moves between cells in intercellular spaces between the cell walls

*faster method

-endodermis regulates what goes into the xylem

-caspirian strip causes all material to move into cells by symplasty

by the cohesion-tension theory

-transpiration pull

-cohesion

-adhesion

-pulls water up plant from leaves

-major force moving water up a plant

-transpiration: loss of water from leaves via stomatas of guard cell.

-ability of water to "stick to itself"

ability of water to stick to other materials

*explains how water moves up a tube or pipe