Nitrogen fixation efficiency, natural15N abundance, and morphology of mesquite (Prosopis glandulosa) root nodules

Virginia, Ross A.; Baird, Lisa; Favre, J. S. La; Jarrell, W. M.; Bryan, Barbara A.; Shearer, Georgia

doi:10.1007/bf02182350

Cited by 26 publications

(13 citation statements)

References 19 publications

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“…They are also comparable to values given for the woody legume mesquite (Virginia et al, 1984) and for a diversity of commercial rhizobial isolates tested by Schubert and Evans (1976). Thus, the potential nitrogenase activity of P. spinosus is similar to that of other native and agricultural legumes.…”

Section: Discussionsupporting

confidence: 75%

“…The range of H2 evolved, is less than mesquite nodulating rhizobial isolates (Virginia et al, 1984). The range of rates for P. spinosus rhizobia are lower than the rates reported for Rhizobium leguminosarum isolates, 7.2 to 22.4 micromoles H2 h-~ g fresh nodules-~ (Ruiz- Argueso et al 1978), the only species of Rhizobium reported to be capable of recycling symbiotically evolved H, (Lambert et al, 1985).…”

Section: Discussionmentioning

confidence: 97%

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Rhizobial ecology of the woody legumePsorothamnus spinosus in a Sonoran Desert Arroyo

1988

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Psorothamnus spinosus seedlings were selected at random and excavated from 10 • 30 m quadrats along a 270 m transect in a southern Californian desert arroyo. Forty-six of the fifty seedlings excavated (92%) were nodulated. The mean number of nodules/plant was 7.0 ___ 3.6. Maximum rooting depth was 40 cm, and most (58.8%) of the nodules were found between 15 and 30cm depth. The mean root/shoot ratio was 1.4 _+ 0.4. The rhizobial population density between 10 to 40cm depth across all quadrats was non-detectable using a plant infection, most probable number method. All 70 isolates from field nodules were fast-growing Rhizobium spp. Two colony morphologies were observed: wet, translucent, and wet, opaque. All isolates tested were effective on both P. spinosus and another desert woody legume, mesquite (Prosopis glandulosa). Many isolates had a high relative efficiency, and seven of eight efficient isolates had uptakehydrogenase activity. Root stimulation of the low rhizobial population found in the arroyo and subsequent root nodulation may be an important factor in seedling establishment by woody legumes in N-limited desert arroyo systems.

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Section: Discussionsupporting

confidence: 75%

Section: Discussionmentioning

confidence: 97%

Rhizobial ecology of the woody legumePsorothamnus spinosus in a Sonoran Desert Arroyo

1988

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“…Nitrogen-15 natural abundance measurements have been useful presumptive indicators of nitrogen fixation for broad surveys or for symbiotic systems of unusual difficulty for study (Shearer et al 1983;Virginia et al 1984). However, isotopic discrimination of i5N during microbial transformations may invalidate natural abundance techniques as useful quantitative tools for measuring and tracing fixed nitrogen in the soil (Turner et al 1983;Binkley et al 1985).…”

Section: Problems With Measurement Of Njixationmentioning

confidence: 99%

Sources, fates, and impacts of nitrogen inputs to terrestrial ecosystems: review and synthesis

et al. 1988

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Abstract. The relative importance of nitrogen inputs from atmospheric deposition and biological fixation is reviewed in a number of diverse, non-agricultural terrestrial ecosystems. Bulk precipitation inputs of N (I-12kgN ha-' yr-') are the same order of magnitude as, or frequently larger than, the usual range of inputs from nonsymbiotic fixation (< 1 -5 kg N ha-' yr-I), especially in areas influenced by industrial activity. Bulk precipitation measurements may underestimate total atmospheric deposition by 3040% because they generally do not include all forms of wet and dry deposition. Symbiotic fixation generally ranges from z lo-160 kg N ha-' yr-' in ecosystems where N-fixing species are present during early successional stages, and may exceed the range under unusual conditions.Rates of both symbiotic and nonsymbiotic fixation appear to be greater during early successional stages of forest development, where they have major impacts on nitrogen dynamics and ecosystem productivity. Fates and impacts of these nitrogen inputs are important considerations that are inadequately understood. These input processes are highly variable in space and time, and few sites have adequate comparative information on both nitrogen deposition and fixation.The existing information on N inputs is deficient in several areas: -more intensive studies of total atmospheric deposition, especially of dry deposition, are needed over a wide range of ecosystems; -additional studies of symbiotic fixation are needed that carefully quantify variation over space and time, examine more factors regulating fixation, and focus upon the availability of N and its effects upon productivity and other nutrient cycling processes; -process-level studies of associative N-fixation should be conducted over a range of ecosystems to determine the universal importance of rhizosphere fixation; -further examination of the role of free-living fixation in wood decomposition and soil organic matter genesis is needed, with attention upon spatial and temporal variation; and -investigations of long-term biogeochemical impacts of these inputs must be integrated with process-level studies using modem modelling techniques.

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“…The great majority of Mimosoideae have been demonstrated to nodulate and accumulate N from biological nitrogen-fixation (BNF) (Allen and Allen, 1981;de Faria et al, 1989). Most are deep-rooted trees or shrubs and are known to account for significant fractions of N input and cycling in many dryland ecosystems (Bernhard-Reversat and Poupon, 1980;Jenkins et al, 1987;Virginia et al, 1984;West and Skujins, 1978 etc). However, little is known about spatial and temporal variations in the BNF of NFTs due to environmental, genetic or ecological determinants (H6gberg, 1986;Shearer et al, 1983;Schulze et al, 1991).…”

Section: Introductionmentioning

confidence: 99%

N2-Fixation, nodule efficiency and biomass accumulation after two years in three Chilean legume trees and Tagasaste Chamaecytisus proliferus subsp. palmensis

et al. 1996

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Nitrogen fixation efficiency, natural15N abundance, and morphology of mesquite (Prosopis glandulosa) root nodules

Cited by 26 publications

References 19 publications

Rhizobial ecology of the woody legumePsorothamnus spinosus in a Sonoran Desert Arroyo

Rhizobial ecology of the woody legumePsorothamnus spinosus in a Sonoran Desert Arroyo

Sources, fates, and impacts of nitrogen inputs to terrestrial ecosystems: review and synthesis

N2-Fixation, nodule efficiency and biomass accumulation after two years in three Chilean legume trees and Tagasaste Chamaecytisus proliferus subsp. palmensis

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