Rhizobium Strain Effects on Yield and Bleeding Sap Amino Compounds in Pisum sativum.

Lis Rosendahl

    Research output: Contribution to journalJournal articleResearchpeer-review


    Bleeding sap composition, dry matter production and N distribution in pea (P. sativum L. cv. Bodil) grown with and without nitrate and nodulated with either R. leguminosarum strain 128c53 or strain 1044 were compared. Nitrate increased the total dry matter production of both symbioses, but decreased both the proportions of belowground dry matter to total dry matter production and nodule dry matter to total belowground dry matter production. The total dry matter yield and N accumulation was greater in the symbiosis with strain 1044, whereas the accumulation of N in the roots plus nodules relative to the total N-accumulation was greater with strain 128c53 due to a higher production of nodule tissue. The root bleeding sap of the symbiosis with the greater yield (strain 1044) contained high levels of asparagine and aspartic acid. In the 128c53 symbiosis, glutamine plus homoserine accounted for a higher percentage of the organic solutes transporting newly assimilated N from the root system than in the association with 1044. The Rhizobium strain effect on amino compound composition of the bleeding sap may indicate an influence of the bacteroids on either the N-assimilatory enzyme system in the plant cytosol, or on the pools of the Krebs cycle intermediates or related compounds in the nodules.
    Original languageEnglish
    JournalPhysiologia Plantarum
    Issue number2
    Pages (from-to)215-220
    Publication statusPublished - 1984


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