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Bethlenfalvay GJ, Abu-Shakra SS, Phillips DA. Interdependence of Nitrogen Nutrition and Photosynthesis in Pisum sativum L: II. Host Plant Response to Nitrogen Fixation by Rhizobium Strains. Plant Physiol. 1978;62(1):131-3doi: 10.1104/pp.62.1.131.
Bethlenfalvay, G. J., Abu-Shakra, S. S., & Phillips, D. A. (1978). Interdependence of Nitrogen Nutrition and Photosynthesis in Pisum sativum L: II. Host Plant Response to Nitrogen Fixation by Rhizobium Strains. Plant physiology, 62(1), 131-3. https://doi.org/10.1104/pp.62.1.131
Bethlenfalvay, G J, et al. "Interdependence of Nitrogen Nutrition and Photosynthesis in Pisum sativum L: II. Host Plant Response to Nitrogen Fixation by Rhizobium Strains." Plant physiology vol. 62,1 (1978): 131-3. doi: https://doi.org/10.1104/pp.62.1.131
Bethlenfalvay GJ, Abu-Shakra SS, Phillips DA. Interdependence of Nitrogen Nutrition and Photosynthesis in Pisum sativum L: II. Host Plant Response to Nitrogen Fixation by Rhizobium Strains. Plant Physiol. 1978 Jul;62(1):131-3. doi: 10.1104/pp.62.1.131. PMID: 16660451; PMCID: PMC1092071.
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Plant Physiol. 1978 Jul;62(1):131-3. doi: 10.1104/pp.62.1.131.

Interdependence of Nitrogen Nutrition and Photosynthesis in Pisum sativum L: II. Host Plant Response to Nitrogen Fixation by Rhizobium Strains.

Plant physiology

G J Bethlenfalvay, S S Abu-Shakra, D A Phillips

Affiliations

  1. Department of Agronomy and Range Science, University of California, Davis, California 95616.

PMID: 16660451 PMCID: PMC1092071 DOI: 10.1104/pp.62.1.131

Abstract

Physiological responses to infection by strains of Rhizobium leguminosarum which differed in their capacity to reduce N(2) were determined in 26-day-old pea plants (Pisum sativum L. cv. Alaska) grown under uniform environmental conditions in the absence of combined N. The highest N(2) reduction rates, calculated from H(2) evolution and C(2)H(2)-dependent C(2)H(4) production measurements, were approximately 6-fold greater than the lowest. Higher N(2) fixation rates were associated with greater CO(2) exchange rates (R(2) = 0.92) and carboxylation efficiency (R(2) = 0.99). Increases in the apparent relative efficiency of N(2) fixation [1-(H(2) evolved in air/C(2)H(2) reduced)] (acteroid efficiency) were associated with increases in whole-plant N(2) fixation efficiency (N(2)/CO(2) reduction ratio) (R(2) = 0.95). Whole-plant dry weight and total N content were related by regression analysis (R(2) = 0.98); both parameters were enhanced by increased N(2) fixation in a manner analogous to previously reported increases caused by greater external applications of NH(4) (+). These data reveal that photosynthetic parameters in genetically uniform host plants grown under identical environmental conditions are affected by N(2) fixation characteristics of the rhizobial symbiont. The measured efficiencies of micro- and macrosymbiont are directly related under uniform environments.

References

  1. Plant Physiol. 1977 Dec;60(6):868-71 - PubMed
  2. Plant Physiol. 1978 Jul;62(1):127-30 - PubMed
  3. Plant Physiol. 1976 Feb;57(2):325-33 - PubMed
  4. Plant Physiol. 1977 Sep;60(3):419-21 - PubMed
  5. Proc Natl Acad Sci U S A. 1976 Apr;73(4):1207-11 - PubMed

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