Hachi's posts
Posted in it's literally just biology
Posted 5 years ago
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Abscisic acid (ABA) - hormone released by roots/leaves when deficient in water, signals guard cells to close stomata
Abscisic acid (ABA) - hormone released by roots/leaves when deficient in water, signals guard cells to close stomata
Posted in it's literally just biology
Posted 5 years ago
★
Water deficiency → guard cells lose turgor and close stomata
Water deficiency → guard cells lose turgor and close stomata
Posted in it's literally just biology
Posted 5 years ago
★
Environmental stresses (drought, high temp, wind) can cause stomata to close in daytime
Environmental stresses (drought, high temp, wind) can cause stomata to close in daytime
Posted in it's literally just biology
Posted 5 years ago
★
Internal clock in guard cells establishes circadian rhythm (24 hrs) of opening and closing
Internal clock in guard cells establishes circadian rhythm (24 hrs) of opening and closing
Posted in it's literally just biology
Posted 5 years ago
★
CO2 depletion in leaf’s air spaces due to photosynthesis → stomata open
CO2 depletion in leaf’s air spaces due to photosynthesis → stomata open
Posted in it's literally just biology
Posted 5 years ago
★
Light activates receptors in plasma membrane of guard cells → stimulates proton pumps and K+ absorption → stomata open
Light activates receptors in plasma membrane of guard cells → stimulates proton pumps and K+ absorption → stomata open
Posted in it's literally just biology
Posted 5 years ago
★
Stomata open in the day and close at night due to light, CO2 depletion, and internal “clock” in guard cells
Stomata open in the day and close at night due to light, CO2 depletion, and internal “clock” in guard cells
Posted in it's literally just biology
Posted 5 years ago
★
Aquaporins also regulate osmotic swelling/shrinking of guard cells
Aquaporins also regulate osmotic swelling/shrinking of guard cells
Posted in it's literally just biology
Posted 5 years ago
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K+ and water are stored in vacuoles → vacuolar membrane is also a regulator
K+ and water are stored in vacuoles → vacuolar membrane is also a regulator
Posted in it's literally just biology
Posted 5 years ago
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Stomata close when K+ is lost to neighboring cells → osmotic loss of water
Stomata close when K+ is lost to neighboring cells → osmotic loss of water
Posted in it's literally just biology
Posted 5 years ago
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Active transport of H+ out of guard cell → membrane potential drives K+ (from neighboring epidermal cells) into guard cell via ion channels → lowers water potential in guard cells → water enters by osmosis → turgid, stomata opens
Active transport of H+ out of guard cell → membrane potential drives K+ (from neighboring epidermal cells) into guard cell via ion channels → lowers water potential in guard cells → water enters by osmosis → turgid, stomata opens
Posted in it's literally just biology
Posted 5 years ago
★
When turgid → guard cells bow out and open stomata
When turgid → guard cells bow out and open stomata
Posted in it's literally just biology
Posted 5 years ago
★
Guard cells are bound tightly at their tips + radially oriented cellulose microfibrils
Guard cells are bound tightly at their tips + radially oriented cellulose microfibrils
Posted in it's literally just biology
Posted 5 years ago
★
Stomatal density decreases as CO2 increases → measure CO2 levels in past and present climates
Stomatal density decreases as CO2 increases → measure CO2 levels in past and present climates