Relationships between nitrogen fixation and photosynthesis as the main components of the productivity in alfalfa

Kirizii, D. A.; Воробей, Н. А.; Kots, S.Yа.

doi:10.1134/s1021443707050032

Cited by 14 publications

(8 citation statements)

References 10 publications

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“…Biological N fixation has a high energy demand and the rate of legume BNF depends on the C supply, which is the energy source for N fixation. Experimental observations demonstrate that the enhancement of photosynthetic C allocated to roots which is available for N fixation and nodule establishment increases nodule numbers and N fixation rate (Voisin et al, 2003;Haase et al, 2007;Kirizii et al, 2007). However, among the reviewed models only the Hurley Pasture and CROPGRO models implemented this mechanism.…”

Section: Influence Of Plant Substrate C or C Supplymentioning

confidence: 99%

Models of biological nitrogen fixation of legumes. A review

Liu

Baddeley

et al. 2011

Agronomy Sust. Developm.

150

104

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Leguminous crops have the ability to fix nitrogen (N) biologically from the atmosphere. This can benefit not only the legumes themselves but also any intercropped or subsequent crops, thus reducing or removing the need to apply N fertilizers. Improved quantification of legume biological nitrogen fixation (BNF) will provide better guidance for farmers on managing N to optimise productivity and reduce harmful losses to the environment. There are many techniques available for the direct quantitative measurement of legume BNF in the field and in controlled environments. However, these are time-consuming and therefore expensive, and generate data relevant only to the time and place of measurement. Alternatively, legume BNF can be estimated by either empirical models or dynamic mechanistic simulation models. Comparatively, simulation by a dynamic model is preferable for quantifying legume BNF, because of its capability to simulate the response of N fixation to a wide range of environmental variables and legume growth status. Currently there is no published review of the approaches used to simulate, rather than measure, legume BNF. This review of peer-reviewed literature shows that most simulation models estimate the N fixation rate from a pre-defined potential N fixation rate, adjusted by the response functions of soil temperature, soil/plant water status, soil/plant N concentration, plant carbon (C) supply and crop growth stage. Here, we highlight and compare the methods used to estimate the potential N fixation rate, and the response functions to simulate legume BNF, in nine widely-cited models over the last 30 years. We then assess their relative strengths in simulating legume BNF with varying biotic and abiotic factors, and identify the discrepancies between experimental findings and simulations. After this comparison, we identify the areas where there is the potential to improve legume BNF simulation in the future. These include; (1) consideration of photosynthetic C supply, (2) refining the various effects of soil mineral N concentration, (3) characterization and incorporation of excess soil water stress and other factors into models, and (4) incorporation of the effects of grazing, coexistence and competition with intercrops and weeds into models to improve their practical relevance to sustainable agricultural systems. This review clarifies, for the first time, the current progress in legume BNF quantification in simulation models, and provides guidance for their further development, combining fundamental experimental and modelling work. nitrogen fixation / soil mineral nitrogen / legume / simulation / review Contents

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Section: Influence Of Plant Substrate C or C Supplymentioning

confidence: 99%

Models of biological nitrogen fixation of legumes. A review

Liu

Baddeley

et al. 2011

Agronomy Sust. Developm.

150

104

View full text Add to dashboard Cite

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“…A strong, positive correlation should occur between symbiotic nitrogen fixation and photosynthesis, since an actively operating symbiotic apparatus with its high demand for assimilates would promote the export of assimilates from leaves and thus stimulate photosynthetic function (Kirizii et al 2007). In our study, we observed a strong positive correlation between SNF and photosynthate accumulation.…”

Section: Discussionmentioning

confidence: 98%

Variability in the response of six genotypes of N2-fixing Medicago ciliaris to NaCl

et al. 2011

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Genotypic variability was assessed within six Medicago ciliaris genotypes growing symbiotically with Sinorhizobium medicae in order to identify physiological criteria (growth, ion content, and plant health) associated with salt tolerance. Response to salt stress depended on the line and the level of salt. Two lines with lower dry biomass under non-saline conditions (TNC 1.8 from a semi-arid area and TNC 10.8 from a sub-humid area), were more tolerant to NaCl, whereas the most productive lines (TNC 11.5 and TNC 11.9 from a humid bioclime) were more sensitive in terms of growth and nitrogen fixation. Susceptibility of symbiotic nitrogen fixation to saline stress was not associated with a higher accumulation of Na + in nodules, since the most tolerant lines TNC 1.8 and TNC 10.8 accumulated the highest Na + amount in nodules. Leaf area and net photosynthate assimilation rate were conserved in line TNC 1.8 and to a lesser extent in line TNC 10.8 potentially owing to a greater ability to protect aerial organs and nodules from Na + damage and to insure a better supply of leaves with nitrogen. Our results suggest that nodule growth and number and nodule Na + content should not be used as selection tools for tolerance or susceptibility, since two of the tested lines maintained consistent growth in spite of reduced nodule and high Na + content. Instead, the most reliable physiological indicators for tolerance appear to be consistent growth (i.e., no growth changes) and reduced leaf Na + accumulation with increasing concentrations of NaCl.

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“…Cyanobacterium was grown on Fitzgerald medium with the modification by Zehnder and Gorham [ 8 ] in Erlenmeyer flask at 22°C ± 2°C and illumination of 2500 lux until the stationary growth phase. The concentration of chlorophyll (Chl) in cyanobacterial cells was determined by differential fluorometry (Fluorometer FL300 3M, Russia) [ 9 ]. The binary composition was prepared by mixing the bacterial suspensions consisting of nodule bacteria (1 × 10 9 cells/mL) and cyanobacteria (Chl, mg/L = 1506,6 ± 13,4, Δ F = 0,088) in the ratio 1 : 1.…”

Section: Methodsmentioning

confidence: 99%

Biochemical and Molecular Phylogenetic Study of Agriculturally Useful Association of a Nitrogen-Fixing Cyanobacterium and NoduleSinorhizobiumwithMedicago sativaL.

Karaushu

Lazebnaya

Kravzova

et al. 2015

BioMed Research International

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Seed inoculation with bacterial consortium was found to increase legume yield, providing a higher growth than the standard nitrogen treatment methods. Alfalfa plants were inoculated by mono- and binary compositions of nitrogen-fixing microorganisms. Their physiological and biochemical properties were estimated. Inoculation by microbial consortium of Sinorhizobium meliloti T17 together with a new cyanobacterial isolate Nostoc PTV was more efficient than the single-rhizobium strain inoculation. This treatment provides an intensification of the processes of biological nitrogen fixation by rhizobia bacteria in the root nodules and an intensification of plant photosynthesis. Inoculation by bacterial consortium stimulates growth of plant mass and rhizogenesis and leads to increased productivity of alfalfa and to improving the amino acid composition of plant leaves. The full nucleotide sequence of the rRNA gene cluster and partial sequence of the dinitrogenase reductase (nifH) gene of Nostoc PTV were deposited to GenBank (JQ259185.1, JQ259186.1). Comparison of these gene sequences of Nostoc PTV with all sequences present at the GenBank shows that this cyanobacterial strain does not have 100% identity with any organisms investigated previously. Phylogenetic analysis showed that this cyanobacterium clustered with high credibility values with Nostoc muscorum.

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Relationships between nitrogen fixation and photosynthesis as the main components of the productivity in alfalfa

Cited by 14 publications

References 10 publications

Models of biological nitrogen fixation of legumes. A review

Models of biological nitrogen fixation of legumes. A review

Variability in the response of six genotypes of N2-fixing Medicago ciliaris to NaCl

Biochemical and Molecular Phylogenetic Study of Agriculturally Useful Association of a Nitrogen-Fixing Cyanobacterium and NoduleSinorhizobiumwithMedicago sativaL.

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