Unformatted text preview: garud cells. water goes into the
gaurd cells and increase
there turgor pressure and the
h20 and coming out of
the epidermal cells which they are
losing their turgor pressure. there is alot
of chloroplast in them (a) The guard cell absorbs light and produces ATP in the light dependent reaction.
(b) The ATP is used to drive proton pumps that pump out H+ . The inside of the cell
becomes more negative.
(c) Potassium ions enter the cell which increases the solute concentration.
(d) Water moves from the surrounding tissue by osmosis
Air – Plant – Soil Continuum this process is pretty slow Cross section of T. virginiana stoma sampled by snap freezing an intact leaf. you can see the gaurd cell in this pic
inﬂated Franks P, Farquhar G. Plantphysiol 2007;143:78-87 ©2007 by American Society of Plant Biologists Stomatal Function what is needed to open the stomata is not that much light, it is not PAR but blue light.
just know that it is blue light instead of PAR. • Influence of light
– Minimum level just
– Blue light (430-460nm)
is nearly 10X as
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- Winter '08