Abstract
Rapidly growing, cultured tobacco cells secreted pectic substances, glycoprotein, and 50% ethanol-soluble polysaccharide into the medium. The extracellular pectic substances lacked rhamnose which was present in the cell-wall pectic substances. The protein moieties of the extracellular and cell-wall glycoproteins were hydroxy. proline-rich and similar in amino-acid composition. The sugar moiety of the cell-wall glycoprotein was similar in monosaccharide composition to that of the combined extracellular glycoprotein plus the 50% ethanol soluble polysaccharide.
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