Galactose inhibition of auxin-induced cell elongation in oat coleoptile segments |
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Authors: | Ryoichi Yamamoto Yoshio Masuda |
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Affiliation: | Food Science Lab., Tezukayama Junior College, Gakuen-minami, Nara 631.;Dept of Biology, Faculty of Science, Osaka City Univ., Sumiyoshiku, Osaka 558, Japan. |
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Abstract: | Auxin-induced cell elongation in oat coleoptile segments was inhibited by galactose; removal of galactose restored growth. Galactose did not appear to affect the following factors which modify cell elongation: auxin uptake, auxin metabolism, osmotic concentration of cell sap, uptake of tritium-labeled water, auxin-induced wall loosening as measured by a decrease in the minimum stress-relaxation time and auxininduced glucan degradation. Galactose markedly prevented incorporation of [14C]-glucose into cellulosic and non-cellulosic fractions of the cell wall. It was concluded that galactose inhibited auxin-induced long-term elongation of oat coleoptile segments by interfering with cell wall synthesis. |
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Keywords: | Avena sativa cell wall synthesis D-galactose growth inhibition |
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