Growth and cell wall changes in azuki bean epicotyls I. : Changes in wall polysaccharides during intact growth
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概要
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Measurement of endogenous growth rates and the mechanical property of the cell wall in various regions of light-grown azuki bean epicotyls revealed that the minimum stress-relaxation time (T_o) was the shortest in the upper region (0-30 mm below the apex) of the epicotyl, where vigorous endogenous growth took place, and became longer toward the basal region, which was mature and not growing. In the upper region of the epicotyl, a lower percentage of α-cellulose and a higher percentage of pectic substances than in the lower region were found. The percentage of hemicellulose content was almost constant over the whole epicotyl. Major components of noncellulosic neutral sugars in the cell wall were galactose and xylose. The percentage of the galactose content to the noncellulosic polysaccharide was highest in the upper region and lowest in the basal region of the epicotyl, and a clearly negative correlation between the galactose composition and the T_o value was obtained. On the contrary, the percentage of the xylose content was highest in the basal region and lowest in the upper region, and a clearly positive correlation between the xylose composition and the T_o value was obtained. During the endogenous growth of the intact epicotyl, all the neutral sugars, particularly galactose, increased in the upper region, whereas in the middle and basal regions, only xylose increased. Similar changes in sugar compositions were observed during IAA-induced elongation of the segment excised from various regions of the epicotyl.
- 日本植物生理学会の論文
著者
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NISHITANI Kazuhiko
Department of Developmental Biology and Neurosciences, Tohoku University
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MATSUDA Yoshio
Department of Obstetrics and Gynecology, Tokyo Womens' Medical University
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Nishitani Kazuhiko
Department Of Biology Faculty Of Science Osaka City University
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Nishitani Kazuhiko
Department Of Biology Facully Of Science Osaka City University
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Matsuda Yoshio
Department Of Obstetrics And Gynecology Tokyo Women's Medical University
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Matsuda Yoshio
Department Of Biology Faculty Of Science Osaka City University
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Matsuda Yoshio
Department Of Applied Physics Osaka University
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