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Light causes growth of dicotyledonous leaves by stimulating proton efflux, cell wall acidification and loosening, and solute accumulation for turgor maintenance. For cells still undergoing cell division at the base of expanding tobacco (Nicotiana tabacum L. cv. Xanthi) leaves, light-stimulated growth depends on K+ uptake, and is inhibited by the potassium channel blocker tetraethylammonium (TEA)....
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