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Plant and Cell Physiology, 1982, Vol. 23, No. 3 351-364
© 1982

Article

Xyloglucan and rß-D-Glucan in Cell Walls of Rice Seedlings

Yoji Kato1, Shuzo Ito, Katsuhiro Iki and Kazuo Matsuda

Department of Agricultural Chemistry, Faculty of Agriculture, Tohoku University Tsutsumidori, Sendai 980, Japan

Cell walls of 4-day old rice seedlings were extracted successively with ammonium oxalate-oxalic acid, 4% KOH and 24% KOH. A rß-D-glucan preparation and a xyloglucan preparation were isolated from the 4% KOH extract and 24% KOH extract, respectively. Methylation analysis and enzymic degradation studies of the polysaccharides showed that the former was built up predominantly of repeating-oligosaccharide units of 3-O-rß-cellobiosyl-D-glucose and 3-O-rß-cellotriosyl-D-glucose in a molar ratio of 2.6 : 1.0, and the latter was of repeating-oligosaccharide units of {alpha}-D-xylosyl-(1->6)-rß-D-glucosyl-(1->4)-[{alpha}-D-xylosyl-(1->6)]-rß-D-glucosyl-(1->4)-D-glucose, {alpha}-D-xylosyl-(1->6)-rß-D-glucosyl-(1->4)-D-glucose and cellobiose.

1 Present address: Department of Botany, Iowa State University, Ames, Iowa 50011, U.S.A.

(Received August 29, 1981; Accepted January 12, 1982)
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