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Denitrification in intact lucerne plants

, : Denitrification in intact lucerne plants. Journal of Plant Physiology 146(4): 563-565

Denitrification activity upon nitrate supply by intact, attached nodules of lucerne has been measured. This activity clearly shows that nitrate is metabolised in nodules. However, the extent of such an activity was extremely low and only represented 2% of the potential activity of the isolated bacteroids. Also, this activity represented only 0.05% of the nitrogen fixation rate of these nodules. It is concluded that this process is of a very limited impact in normal circumstances and its physiological significance in nodules remains to be understood.

Accession: 002590455

DOI: 10.1016/s0176-1617(11)82024-9

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Related references

Arrese Igor C.; Garcia Plazaola J.I.; Hernandez A.; Diaz A.; Aparicio Tejo P.M., 1990: Denitrification in lucerne nodules. Physiologia Plantarum 79(2 PART 2): A76

Arrese Igor C.; Royuela M.; Aparicio Tejo P.M., 1992: Denitrification in lucerne nodules and bacteroids supplied with nitrate. Physiologia Plantarum. 84(4): 531-536

Garcia Plazaola, J.I.; Arrese Igor, C.; Gonzalez, A.; Aparicio Tejo, P.M.; Becerril, J.M., 1996: Denitrification in lucerne nodules is not involved in nitrite detoxification. Dissimilatory reduction of ionic nitrogen oxides to gaseous forms such as nitrous oxide or nitrogen can be carried out by free living or symbiotic forms of some strains of Rhizobium meliloti. In this paper we investigate whether bacteroid denitrif...

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