(CIE A2 Biology) ABA + stomatal closures

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4 Terms

1
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ABA (abscisic acid)

plant-produced to stimulate stomatal closures during periods of water stress induced by high temperatures/reduced water supplies

2
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what happens when ABA binds to receptors on guard cells

the proton pumps get inhibited to stop active H+ ion transport out of these cells while calcium ions also move into the cytoplasm to act as second messengers

<p>the <strong>proton pumps get inhibited to stop active H<sup>+</sup> ion transport out of these cells</strong> while <strong>calcium ions also move into the cytoplasm to act as second messengers</strong></p>
3
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how the calcium ions moving into the cytoplasm act as second messengers

by opening channel proteins for negatively-charged ion/K+ ion departures + closing the channel proteins that allow for K+ ion entries to increase guard cell water potential

<p>by <strong>opening channel proteins for negatively-charged ion/K<sup>+</sup> ion departures</strong> +<strong> closing the channel proteins that allow for K+ ion entries </strong>to <strong>increase guard cell water potential</strong></p>
4
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what happens after the guard cells gain more water potential during water stress periods

they become flaccid due to water leaving them by osmosis thus shutting the stomata up

<p><strong>they</strong> <strong>become flaccid due to water leaving them by osmosis</strong> thus<strong> shutting the stomata up</strong></p>