By Alan D. Elbein (auth.), Frank A. Loewus, Clarence A. Ryan (eds.)

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Findings of W. D. Bauer and his coworkers at the Charles Kettering Institute. They have obtained evidence that the acidic polysaccharides are required for the development of legume root hairs capable of being infected by symbiont rhizobia; root hairs developed in the absence of these polysaccharides can not be infected (ref. 59 and personal communication). Therefore, these polysaccharides constitute a good example of complex carbohydrates with regulatory properties, in this case an ability to cause a specific differentiation of the epidermal cells of legume roots.

Soc. Trans. 7:783-799. Kornfeld, R. and S. Kornfeld. 197~ Comparative aspects of glycoprotein structure. Ann. Rev. Biochem. 45:213-237. Elbein, A. D. 1979. The role of lipid-linked saccharides in the biosynthesis of complex carbohydrates. Ann. Rev. Plant Physiol. 30:239-272. Waechter, C. J. and W. J. Lennarz. 1976. The role of polyprenol-linked sugars in glycoprotein synthesis. Ann. Rev. Biochem. 45:95-112. Sanford, B. , A. Shelokov and M. A. Ramsey. 1978. Bacterial adherence to virus-infected cells: A cell culture model of bacterial superinfection.

The "~-glucan elicitor" is very active in stimulating phytoalexin accumulation in soybean tissues. The smallest ~-glucan fragments which have elicitor activity contain approximately nine ~-glucosyl residues interconnected by 3-, 6-, and 3,6-g1ucosidic linkages. sp. glycinea S and from the yeast Saccharomyces cerevisiae 17 do not differ significantly in their elicitation of phytoalexin accumulation in several soybean cultivars,S / 17 in French beans,18 and in potatoes. 18 Thus, as is common for regulatory molecules, elicitors are not species specific with regard to their source nor with regard to the cells whose metabolism they regulate.

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