unchanging osmotic potential of -3.31 Mpa. What is the osmotic potential of the Pulvini cell when the leaf blade is horizontal?

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Author:Matthew Douglas, Jung Choi, Mary Ann Clark
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Chapter30: Plant Form And Physiology
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Beans increase or decrease the turgidity of Pulvini cells to change the orientation of leaves. In order
to raise the leaf blades to a horizontal position (as in the right side of the picture) pulvini cells at the
junction between petiole and blade import sugar and potassium ions to increase their Yp from .30
Mpa to 0.67 Mpa. The pulvini cells are at equilibrium both before (leaf held more vertically) and after
(leaf held horizontally) moving with an interstitial fluid that is not under pressure and has an
unchanging osmotic potential of -3.31 Mpa.
What is the osmotic potential of the Pulvini cell when the leaf blade is horizontal?
Transcribed Image Text:Beans increase or decrease the turgidity of Pulvini cells to change the orientation of leaves. In order to raise the leaf blades to a horizontal position (as in the right side of the picture) pulvini cells at the junction between petiole and blade import sugar and potassium ions to increase their Yp from .30 Mpa to 0.67 Mpa. The pulvini cells are at equilibrium both before (leaf held more vertically) and after (leaf held horizontally) moving with an interstitial fluid that is not under pressure and has an unchanging osmotic potential of -3.31 Mpa. What is the osmotic potential of the Pulvini cell when the leaf blade is horizontal?
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Pulvinus 

It is located at the base of the leaflets. Pulvinus sometimes also known as geniculum. 

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