Hormones213-page6 - The proton pumps increase the H...

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Plant Growth Regulators - 6 Auxin polar transport Auxin synthesis in leaf Auxin transport protein (yellow) Auxin Functions Auxin promotes elongation and cell enlargement For cell elongation, auxins initiate expression of proton pump genes, which result in the activation of proton pumps in the plasma membrane.
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Unformatted text preview: The proton pumps increase the H + concentration in cell walls, which stimulates expansins, proteins that disrupt hydrogen bonds and break cross linkages in cellulose. This facilitates wall elongation when cells take in more water. Auxin role in cell wall expansion...
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