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Enhancement of CO₂ Uptake in Avena Coleoptiles by Fusicoccin ¹

^a Department of Botany, San Diego State University, San Diego, California 92182

When Avena coleoptile segments are immersed in a solution containing H¹⁴CO₃^–, the appearance of label in the tissue is stimulated approximately 3-fold by fusicoccin application. This effect is rapid (1-2 minutes lag time), dependent upon respiratory energy, inhibited by carbonyl cyanide m-chlorophenylhydrazone, but not appreciably altered by cycloheximide treatment. A large percentage of the cellular radioactivity is found in the form of malate. Preliminary experiments indicate that CO₂, as opposed to HCO₃^–, is the favored species of "CO₂" taken up by the segments. These results are consistent with the notion that CO₂, presumably by virtue of its fixation and conversion to malic acid, participates in the early events associated with fusicoccin-enhanced acidification of the cell wall region leading to the stimulation of cell extension growth.