The living leaf valve.

How does one living pore trade gas for water?

Setting up the mechanism…

Pore width: 0.00µm
Relative gas conductance: 0.00
Relative vapor loss: 0.00

Fit the specimen and set conditions before running.

How does one living pore trade gas for water?

Turgid guard cells bend apart and open the pore. Carbon dioxide can diffuse through the opening, while a vapor gradient also draws water out.

width = 10 µm/MPa · turgor

What this model simplifies

One dicot stoma with width=10 µm/MPa times turgor over 0–0.8 MPa. Relative conductance and water loss are dimensionless comparisons, not measured rates.

Read the source · openstax.org ↗

Put it to work.

Open a pore at least 5 µm wide while keeping some water-vapor gradient.

Make it work.

Compare gas exchange and water loss through an open pore.

Run

Fine adjustments 2

Guard-cell turgorMPa

Relative humidity%

The living leaf valve.

How does one living pore trade gas for water?

Loading the experiment…

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The living leaf valve.

How does one living pore trade gas for water?

Setting up the mechanism…

Pore width: 0.00µm
Relative gas conductance: 0.00
Relative vapor loss: 0.00

Fit the specimen and set conditions before running.

How does one living pore trade gas for water?

Turgid guard cells bend apart and open the pore. Carbon dioxide can diffuse through the opening, while a vapor gradient also draws water out.

width = 10 µm/MPa · turgor

What this model simplifies

One dicot stoma with width=10 µm/MPa times turgor over 0–0.8 MPa. Relative conductance and water loss are dimensionless comparisons, not measured rates.

Read the source · openstax.org ↗

Put it to work.

Open a pore at least 5 µm wide while keeping some water-vapor gradient.

Make it work.

Compare gas exchange and water loss through an open pore.

Run

Fine adjustments 2

Guard-cell turgorMPa

Relative humidity%