Increased Molecular Mass of Hemicellulosic Polysaccharides is Involved in Growth Inhibition of Maize Coleoptiles and Mesocotyls under Hypergravity Conditions |
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Authors: | Kouichi Soga Keita Harada 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, Osaka, 558–8585 Japan, JP |
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Abstract: | Zea mays L. cv. Cross Bantam T51) coleoptiles and mesocotyls was suppressed by hypergravity at 30 g and above. Acceleration at 300 g significantly decreased the mechanical extensibility of cell walls of both organs. Hypergravity increased the amounts of
hemicellulose and cellulose per unit length in mesocotyl walls, but not in coleoptile walls. The weight-average molecular
masses of hemicellulosic polysaccharides were also increased by hypergravity in both organs. On the other hand, the activities
of β-glucanases extracted from coleoptile and mesocotyl cell walls were decreased by hypergravity. These results suggest that
the decreased activities of β-glucanases by hypergravity cause an increase in the molecular mass of hemicellulosic polysaccharides
of both organs. The upshift of molecular mass of hemicellulosic polysaccharides as well as the thickening of cell walls under
hypergravity conditions seems to be involved in making the cell wall mechanically rigid, thereby inhibiting elongation growth
of maize coleoptiles and mesocotyls.
Received 22 February 1999/ Accepted in revised form 20 April 1999 |
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Keywords: | : Cell wall extensibility Coleoptile Hypergravity Maize (Zea mays) Mesocotyl Molecular mass of hemicellulosic polysaccharides |
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