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Forums The Undercurrent it's literally just biology

Voltie Posted 7 years ago ( 2019/08/18 22:08:08 )
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Stomatal density decreases as CO2 increases → measure CO2 levels in past and present climates

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Voltie Posted 7 years ago ( 2019/08/18 22:24:30 )
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Guard cells are bound tightly at their tips + radially oriented cellulose microfibrils

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Voltie Posted 7 years ago ( 2019/08/18 22:24:37 )
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When turgid → guard cells bow out and open stomata

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Voltie Posted 7 years ago ( 2019/08/18 22:24:46 )
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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

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Voltie Posted 7 years ago ( 2019/08/18 22:24:53 )
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Stomata close when K+ is lost to neighboring cells → osmotic loss of water

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Voltie Posted 7 years ago ( 2019/08/18 22:25:02 )
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K+ and water are stored in vacuoles → vacuolar membrane is also a regulator

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Voltie Posted 7 years ago ( 2019/08/18 22:25:12 )
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Aquaporins also regulate osmotic swelling/shrinking of guard cells

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Voltie Posted 7 years ago ( 2019/08/18 22:53:16 )
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Stomata open in the day and close at night due to light, CO2 depletion, and internal “clock” in guard cells

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Voltie Posted 7 years ago ( 2019/08/18 22:53:26 )
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Light activates receptors in plasma membrane of guard cells → stimulates proton pumps and K+ absorption → stomata open

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Voltie Posted 7 years ago ( 2019/08/18 22:53:33 )
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CO2 depletion in leaf’s air spaces due to photosynthesis → stomata open

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Voltie Posted 7 years ago ( 2019/08/18 22:53:40 )
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Internal clock in guard cells establishes circadian rhythm (24 hrs) of opening and closing

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Voltie Posted 7 years ago ( 2019/08/18 22:53:47 )
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Environmental stresses (drought, high temp, wind) can cause stomata to close in daytime

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Voltie Posted 7 years ago ( 2019/08/18 22:53:53 )
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Water deficiency → guard cells lose turgor and close stomata

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Voltie Posted 7 years ago ( 2019/08/18 22:54:01 )
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Abscisic acid (ABA) - hormone released by roots/leaves when deficient in water, signals guard cells to close stomata

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Voltie Posted 7 years ago ( 2019/08/18 22:54:09 )
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Reduces wilting but also slows rate of photosynthesis

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Voltie Posted 7 years ago ( 2019/08/18 22:54:32 )
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Turgor is necessary for cell elongation → growth ceases in drought

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Voltie Posted 7 years ago ( 2019/08/18 22:54:57 )
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Open stomata → transpiration is high when sunny, warm, dry, and windy

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Voltie Posted 7 years ago ( 2019/08/18 22:55:05 )
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If transpiration can’t pull water to the leaves → shoot loses turgor pressure, wilts

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Voltie Posted 7 years ago ( 2019/08/18 22:55:13 )
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Transpiration → evaporative cooling. Prevents denaturation of plant proteins

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Voltie Posted 7 years ago ( 2019/08/18 22:55:54 )
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Water availability is a major determinant of plant productivity

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