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Plant and Cell Physiology, 1984, Vol. 25, No. 6 955-963
© 1984

Article

Sugar Compositions, Intrinsic Viscosities and Molecular Weights of Hemicellulosic Polysaccharides of the Coleoptile Cell Walls in a Semi-Brachytic and a Normal Type Barley

Naoki Sakurai and Susumu Kuraishi

Department of Environmental Studies, Faculty of Integrated Arts and Sciences, Hiroshima University Hiroshima 730, Japan

The sugar compositions and intrinsic viscosities of the hemicellulosic polysaccharides of the coleoptile cell wall were determined in a normal type barley and a semi-brachytic type which produced less IAA than the normal type. The major sugar components of hemicelluloses for both strains were arabinose (Ara), xylose (Xyl) and glucose (Glc). The Ara and Xyl content per unit length in the normal type did not change during growth, while those in the semi-brachytic type decreased during growth. The Glc contents per unit length and per coleoptile decreased during growth in both types of barley. The intrinsic viscosity of hemicelluloses from the coleoptile of the normal type was lower than that of the semi-brachytic type.

These results suggested that the synthesis of arabinoxylan kept pace with the growth of the coleoptile in the normal type but not in the semi-brachytic type, and that the average mol wt of the hemicelluloses in the normal type was lower than that in the semibrachytic type. These chemical and physical changes in the hemicellulosic polysaccharides may account for the stunted coleoptile of the semi-brachytic barley with its less amount of endogenous IAA.

(Received March 14, 1984; Accepted June 8, 1984)
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