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Plant and Cell Physiology, 1980, Vol. 21, No. 6 999-1005
© 1980

Article

Oriented structure of pectic polysaccharides in pea epidermal cell walls

Ryuzo Hayashi1, Hiromichi Morikawa, Norihiko Nakajima2, Yoshiaki Ichikawa and Mitsugi Senda

Department of Agricultural Chemistry, Faculty of Agriculture, Kyoto University Kyoto 606, Japan

Polarized infrared absorption spectra of film specimens of the epidermal cell wall of the third internode of pea stems were recorded before and after treatment with endopolygalacturonase (endo-PG) and endo-pectin lyase (endo-PL). The spectra showed that the pectic polysaccharides solubilized with endo-PG were essentially the same as those solubilized with endo-PL. The degree of esterification of the pectic polysaccharides was about 20%, and their major sugar components were uronic acids (32.8%), arabinose (48.1%) and galactose (19.2%). The polarized infrared spectra showed that pectic polysaccharides have an oriented structure in cell walls with their molecular chains oriented preferentially parallel to the direction of cell elongation.

1Present address: Research and Development, Kanzaki Paper Mfg. Co., Ltd., Amagasaki, Hyogo 660, Japan.

2Present address: Wakayama Research Laboratories, Kao Soap Co., Ltd., Wakayama 640-91, Japan.

(Received June 28, 1980; )
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