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Effect of Rhizobium Polysaccharide on the Formation of Polygalacturonase in Lucerne and Clover


IN a previous paper1 results were presented showing that polygalacturonase is produced in associations of lucerne or clover plants and their specific bacteria. Some of the results suggested that it was formed by the plants not by the bacteria, and it was assumed that the bacteria secrete a substance which specifically induces the synthesis of polygalacturonase by the plant. It was further suggested that the active component might be a polysaccharide; the nodule bacteria used form abundant slime, and from work with the chemically related Pneumococcus polysaceharides it is known that such substances may exhibit a marked specificity in antigenic properties and chemical structure2.

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  1. 1

    Fåhraeus, G., and Ljunggren, H., Physiol. Plant., 12, 145 (1959).

  2. 2

    Heidelberger, M., “Lectures in immunochemistry” (Academic Press, New York, 1956).

  3. 3

    Dorn, M., Zbl. Bakt., II Abt., 109, 120 (1956).

  4. 4

    Wiley, B. B., and Scherp, H. W., Canad. J. Microbiol., 4, 505 (1958).

  5. 5

    Morgan, W. T. J., in “The Nature of the Bacterial Surface”, Symp. Soc. Gen. Microbiol. (Oxford, 1949).

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