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Effect of pH and Auxin on Chloride Uptake into Avena Coleoptile Cells ¹

^a Department of Botany, University of Massachusetts, Amherst, Massachusetts 01002

The effect of pH on ³⁶Cl^– movement into coleoptile cells (Avena sativa L. cv. Garry) was investigated and compared with effects of indoleacetic acid. ³⁶Cl^– uptake, but not efflux, is stimulated when coleoptile sections are placed in media adjusted to pH levels from 5 to 3 after a preincubation period at pH 6.5. The enhancement is seen within 2 minutes, is not correlated with growth, and is completely erased by respiratory inhibitors. In comparison to the acid-induced stimulation, the stimulatory effect of indoleacetic acid on ³⁶Cl^– uptake is also not accompanied by accelerated efflux, and indoleacetic acid does not further stimulate ³⁶Cl^– uptake into 1-millimeter sections beyond that seen at pH 3.5 without auxin.