PLANT PHYSIOLOGY
CHAPTER 10 - Stomatal Biology
1. Guard cell structure, function and location
a. Turgor pressure changes in guard cells induces
stomatal changes by mechanical
forces
b. Stomas close at night (photosynthesis NOT happening)
c. Stomas open during the day (photosynthesis
happening)
d. Increased CO2 demand in leaf INCREASES turgor
pressure which opens stomatas
e. Need to reduce water use (aka water is limiting)
=>>>>>>>>> decrease in turgor pressure =>>>>>>which
closes stomas
f. The exiting of water is what causes the turgor pressure
to go down=>>>>>>>>>>>close the pore
g. Water and oxygen leave and CO2 enters
h. Stomates allow plants to:
i. Efficiently exchange gases in a dry environment
ii. transpiration
iii. Conserve water
