Suppression of cell wall stiffening along coleoptiles of wheat (Triticum aestivum L.) seedlings grown under osmotic stress conditions |
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Authors: | Kazuyuki Wakabayashi Takayuki Hoson Seiichiro Kamisaka |
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Institution: | (1) Department of Biology, Faculty of Science, Osaka City University, Sugimoto 3, Sumiyoshi-ku, 558 Osaka, Japan |
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Abstract: | Effects of polyethylene glycol (PEG)-induced osmotic stress on the mechanical properties of cell walls and the levels of their
components were investigated along intact wheat (Triticum aestivum L.) coleoptiles. Stress-relaxation analysis showed that the cell walls of stressed coleoptiles were loosened as compared
with those of unstressed ones not only in the apical but in the basal regions. The amounts of wall-bound ferulic acid (FA)
and diferulic acid (DFA) of stressed coleoptiles were substantially lower than those of unstressed ones in all regions. The
cellulose and hemicellulose contents increased toward the coleoptile base. Osmotic stress reduced the cellulose content in
the basal region but it slightly affected the hemicellulose content. The molecular weight of hemicellulose in the apical region
of stressed coleoptiles was higher than that of unstressed ones, while that in the basal region was almost the same in both
coleoptiles. FA, DFA and cellulose contents correlated with the cell wall mechanical property. The amount and molecular weight
of hemicellulose, however, did not correlate. These results suggest that the reduced levels of FA and DFA in all regions and
cellulose in the basal region of wheat coleoptiles are involved in maintaining the cell wall extensibility under osmotic stress. |
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Keywords: | Cell wall extensibility Cell wall polysaccharide Coleoptile Diferulic acid Ferulic acid Wheat |
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