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Plant and Cell Physiology, 1977, Vol. 18, No. 2 371-380
© 1977

Article

Auxin- and hydrogen ion-induced cell wall loosening and cell extension in Avena coleoptile segments

Naoki Sakurai1, Donald J. Nevins2 and Yoshio Masuda1

1 Department of Biology, Faculty of Science, Osaka City University Sumiyoshi-ku, Osaka 558, Japan
2 Department of Botany and Plant Pathology, Iowa State University Ames, Iowa 50011, U.S.A.

Hydrogen ions and auxin induce rapid cell extension of Avena coleoptile segments. Nojirimycin (5-amino-5-deoxy-D-glucopyranose), a potent glucanase inhibitor, inhibits auxin-induced growth but does not affect hydrogen ion-induced extension. This inhibitor has little effect on respiration of coleoptile segments but strongly inhibits the in vitro activity of ß-glucosidase. Hydrogen ions and auxin decreased the minimum stress-relaxation time of the cell wall, indicating that both enhanced cell extension through cell wall loosening. The hemicellulosic glucose content of the cell wall which was decreased by auxin after about a 2-hr lag, was not affected by hydrogen ions. These results suggest that cell wall loosening induced by hydrogen ions may not be the same as that caused by auxin, although both phenomena are represented by the decrease in the minimum stress-relaxation time.

(Received November 1, 1976; )
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