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Plant and Cell Physiology, 1978, Vol. 19, No. 7 1217-1223
© 1978

Article

Auxin-indnced changes in barley coleoptile cell wall composition

Naoki Sakurai and Yoshio Masuda

Department of Biology, Faculty of Science, Osaka City University Siumyoshi-ku, Osaka 558, Japan

Auxin induces extension growth of barley coleoptile segments, causing cell extension and cell wall loosening represented by a change in mechanical properties of the cell wall. This response decreased after the segments were starved for more than 12 hr in buffer solution. Auxin decreased the noncellulosic glucose content of the cell wall of the segments starved for 0 and 6 hr, but very little that of segments starved for 12 and 18 hr. The contents of arabinose, xylose and galactose, among noncellulosic polysaccharides, and {alpha}-cellulose of the cell wall increased during the starvation, but auxin did not affect them. The auxin-induced decrease in glucose content was inhibited by nojirimycin, a potent inhibitor of ß-glucanase, which inhibited auxin-induced extension and changes in mechanical properties of the cell wall, suggesting that cell wall loosening, and thus cell extension, resulted from partial degradation of ß-glucan of the cell wall.

(Received April 20, 1978; )
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