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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
Forums The Undercurrent it's literally just biology
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Guard cells are bound tightly at their tips + radially oriented cellulose microfibrils
Guard cells are bound tightly at their tips + radially oriented cellulose microfibrils
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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
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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
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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
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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
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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
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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
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If transpiration can’t pull water to the leaves → shoot loses turgor pressure, wilts
If transpiration can’t pull water to the leaves → shoot loses turgor pressure, wilts
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Transpiration → evaporative cooling. Prevents denaturation of plant proteins
Transpiration → evaporative cooling. Prevents denaturation of plant proteins
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Having you as a Voltie would be awesome.