Changes in Wall Polysaccharides of Squash (Cucurbita maxima Duch.) Hypocotyls under Water Stress Condition I. Wall Sugar Composition and Growth as Affected by Water Stress
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概要
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Hypocotyl growth of dark-grown squash (Cucurbita maxima Duch.) seedlings was greatly reduced by the addition of 60 m_M polyethylene glycol (PEG) to hydroponic solution (water stress). When PEG was removed after one day, growth promptly recovered . The contents of hemicelluloses and cellulose in the wall increased under unstressed condition as hypocotyls grew but these increases were substantially reduced by water stress. The increases in wall polysaccharide contents recovered when the water stress was relieved. The amounts per hypocotyl of cellulose and that of uronic acid in pectin changed in parallel with the growth (r=0.95 and 0.98, respectively). The amounts of most of the sugar components of hemicelluloses also changed in parallel with hypocotyl growth. Pectic and hemicellulosic galactose content of unstressed hypocotyls increased to day 2 when the hypocotyl grew at a maximum growth rate, then decreased. In contrast, galactose content of stressed hypocotyls progressively increased to the end of the experiment. The results indicated that water stress substantially reduced net increases in most of the polysaccharides of the hypocotyl cell walls when it reduced the growth, but it did not affect syntheses of some galactosic polysaccharides in pectin and hemicellulose B. We assume that the syntheses of non-galactosic wall polysaccharides are associated with hypocotyl growth and the synthesis of galactose-containing polysaccharides with preservation of the potential of the cell wall to be loosened, since hypocotyl growth promptly and completely recovers when water stress is relieved.
- 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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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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Tanaka Sadahiro
Department of Environmental Studies, Faculty of Intergrated Arts and Sciences, Hiroshima University
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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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Tanaka S
Kyoto Univ. Kyoto Jpn
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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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