Rhizobium leguminosarum strains forming nitrogen-rich nodules inPisum sativum |
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Authors: | V. Škrdleta M. Němcová L. Lisá D. Kovářová K. Novák |
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Affiliation: | (1) Institute of Microbiology, Czechoslovak Academy of Sciences, 142 20 Progue 4 |
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Abstract: | The nodules which developed on the roots ofPisum sativum after inoculation withRhizobium leguminosarum bv.viciae strains showing a Hup+ symbiotic phenotype and/or a high relative efficiency of electron transfer to dinitrogen (RE) had a high nitrogen content of their tissue. In comparison with the nodules initiated by a strain possessing the Hup− symbiotic phenotype or by an indigenous soilRhizobium population, the nitrogen-rich root nodules contained up to four times more nitrogen (9.2% of dry mass). In the nitrogen-rich nodules, total amino acid, and especially Ala, Lys and Phe contents were significantly increased. The nitrogen-rich nodule symbiotic phenotype (Nrn) was well expressed, irrespective of pea cultivars and host plant age. If a strain showing the Nrn phenotype was applied in double-strain inocula, a significant correlation was found between increasing rates of the strain and increasing percentage nitrogen content of nodule tissue in the nodulated plants. |
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