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. 1979 May;63(5):892–897. doi: 10.1104/pp.63.5.892

Environmental and Genotypic Effects on the Respiration Associated with Symbiotic Nitrogen Fixation in Peas 1

John D Mahon a
PMCID: PMC542940  PMID: 16660833

Abstract

Estimated values for the respiration associated with symbiotic nitrogen fixation in Pisum sativum L. were independent of irradiance, temperature, plant age, and CO2 concentration, despite large variation in the total rates of C2H2 reduction and root + nodule respiration. Similar values were also found in Phaseolus vulgaris L., Vicia faba L. and Glycine max (L.) Merr. Among all combinations of four Pisum cultivars with four Rhizobium leguminosarum inoculants only the plant genotype significantly affected the fixation-linked respiration, although both plant and bacterial types significantly influenced the total rate of C2H2 reduction. On the basis of measured rates of H2 evolution and C2H2 reduction, or total nitrogen gain in the same system, the least respiration per unit of ammonia produced symbiotically was estimated as 4.8 to 6.9 moles CO2 (mole NH3)−1 in Laxton's Progress and the greatest as 9.3 to 13.3 moles CO2 (mole NH3)−1 in an Indian cultivar, as compared to a theoretical minimum respiration requirement of 4.7 moles CO2 (mole NH3)−1 in peas.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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