Comparative effect of inorganic N on plant growth and N2 fixation of ten legume crops: towards a better understanding of the differential response among species - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Accéder directement au contenu
Article Dans Une Revue Plant and Soil Année : 2018

Comparative effect of inorganic N on plant growth and N2 fixation of ten legume crops: towards a better understanding of the differential response among species

Maé Guinet
Bernard Nicolardot
Cécile Revellin
Anne-Sophie Voisin

Résumé

AimsA better understanding of how plant growth, N nutrition and symbiotic nitrogen fixation (SNF) are influenced by soil inorganic N availability, for a wide range of legume species, is crucial to optimise legume productivity, N2 fixation, while limiting environmental risks such as N leaching. MethodsA comparative analysis was performed for ten legume crops, grown in a field experiment and supplied with four N fertiliser rates. Dry matter, N concentration and SNF were measured. In parallel, root elongation rates were studied in a greenhouse experiment. ResultsFor most species, N fertilisation had little effect on plant growth and N accumulation. SNF was reduced by soil inorganic N available at sowing but with large differences in the magnitude of the response among species. The response varied according to plant N requirements for growth and plant ability to retrieve inorganic N. Accordingly, root lateral expansion rate measured in RhizoTubes was highly correlated with plant ability to retrieve inorganic N measured in the field experiment. Conclusion Combining SNF response to soil inorganic N, shoot N and plant ability to retrieve inorganic N, allowed a robust evaluation of differential response to soil inorganic N among a wide range of legume species.
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hal-01866918 , version 1 (03-09-2018)

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Maé Guinet, Bernard Nicolardot, Cécile Revellin, Vincent Durey, Georg Carlsson, et al.. Comparative effect of inorganic N on plant growth and N2 fixation of ten legume crops: towards a better understanding of the differential response among species. Plant and Soil, 2018, 432 (1-2), pp.207-227. ⟨10.1007/s11104-018-3788-1⟩. ⟨hal-01866918⟩
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