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Growth Regulation in Dwarf Barley Coleoptiles by the Minor Cell Wall Components, Galactose and Mannose
Authors:Sakurai  Naoki; Inouhe  Masahiro; Masuda  Yoshio; Kuraishi  Susumu
Institution:2Department of Environmental Studies, Faculty of Integrated Arts and Sciences, Hiroshima University Hiroshima 730, Japan
3Department of Biology, Faculty of Science, Osaka City University Osaka 558, Japan
Abstract:Sugar compositions of cell walls of dark-grown coleoptiles from12 barley strains, 11 of which were coleoptilar semi-dwarf strains,were analyzed on days 2 and 3 after germination. Major wallcomponents of the 12 strains were arabinose, xylose, and glucosein hemicellulose and cellulose; minor components were galactoseand mannose. The sugar content of each wall component per unit length wasnot correlated to any growth parameters calculated from a logisticequation simulating coleoptile growth, but the relative contentsof galactose and mannose in relation to the total wall sugarcontent was correlated to the growth rate on day 3 and the growthcontinuing period. These facts suggest that growth of these12 barley strains in the late growth stage is regulated by theminor wall components, galactose and mannose. 1 Dedicated to the late Professor Joji Ashida. (Received October 12, 1982; Accepted January 12, 1983)
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