Effects of ABA on Synthesis of Cell-Wall Polysaccharides in Segments of Etiolated Squash Hypocotyl : I.Changes in Incorporation of Glucose and myo-Inositol into Cell-Wall Components
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概要
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Externally supplied [^3H]myo-inositol and [^<14>C]glucose were incorporated in cell-wall fractions of segments of etiolated squash hypocotyl. The extent of incorporation of [^<14>C]glucose into cell-wall fractions was very much greater than that of [^3H]myo-inositol. Radioactivity from [^<14>C]-glucose was effectively incorporated into hemicellulose B and cellulose fractions and was incorporated uniformly into hexose, pentose and uronic acid residues, but radioactivity from [^3H]myo-inositol was incorporated predominantly into uronic acid and pentose residues in the pectin and hemicellulose B fractions. Exogenously applied ABA significantly suppressed the elongation of segments of squash hypocotyl and the incorporation of radioactivity from [^<14>C]glucose and [^3H]myo-inositol into the segments. Furthermore, ABA significantly inhibited the distribution of incorporated radioactivity from [^<14>C]glucose into the cellulose fraction, but did not affect distribution into the pectic fraction. By contrast, ABA only slightly inhibited the distribution of the incorporated radioactivity from [^3H]myo-inositol into the pectic fraction. These results suggest that most of the cell-wall polysaccharides in segments of squash hypocotyl are synthesized via the UDP-sugar pathway, and that ABA significantly inhibits the synthesis of cellulose but not the synthesis of pectic polysaccharides when ABA suppresses the elongation of the segments.
- 日本植物生理学会の論文
著者
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Kuraishi Susumu
Department of Environmental Studies; Faculty of Integrated Arts and Sciences, Hiroshima University
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Sakurai Naoki
Department Of Environmental Studies Faculty Of Integrated Arts And Sciences Hiroshima University
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WAKABAYASHI Kazuyuki
Department of Biology, Faculty of Science, Osaka City University
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Sakurai Naoki
Fac. Integrated Arts & Sci. Hiroshima Univ.
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Sakurai Naoki
Department Of Environmental Studies Faculty Of Intergrated Arts And Sciences Hiroshima University
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Sakurai Naoki
Department Of Biology Faculty Of Science Osaka City University:(present)department Of Environmental
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Sakurai N
Fac. Integrated Arts & Sci. Hiroshima Univ.
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Kuraishi S
Hiroshima Univ. Higashi Hiroshima Jpn
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Wakabayashi Kazuyuki
Department Of Biology And Geosciences Graduate School Of Science Osaka City University
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Wakabayashi Kazuyuki
Biological Laboratory Faculty Of Education Kagawa University:(present)department Of Biology Faculty
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Kuraishi Susumu
Department Of Biology College Of Education University Of Tokyo:(present)department Of Enviromental S
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Sakurai Naoki
Department Of Biology
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