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Articles

Hydrogen Ion Entry as a Controlling Factor in the Acid-growth Response of Green Pea Stem Sections ¹

David L. Rayle^b

^a Department of Botany, University of Washington, Seattle, Washington 98195, Department of Botany, San Diego State University, San Diego, California, 92115

The ability of green pea (Pisum sativum var. Alaska) stem sections to elongate in response to H⁺ has been reinvestigated. Contrary to the conclusions of Barkley and Leopold, (Plant Physiol. 1973. 52: 76-78) these sections elongate in response to H⁺ whenever H⁺ entry through the cuticle is facilitated by slits, holes, or removal. Both live and frozen-thawed sections can undergo acid-induced elongation. Green pea stems behave as predicted by the acid-growth theory.