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Annals of Botany 82: 687-690, 1998
© 1998 Annals of Botany Company

COMMUNICATION

Nodule Function in Symbiotic Bambara Groundnut (Vigna subterraneaL.) and Kersting's Bean (Macrotyloma geocarpumL.) is Tolerant of Nitrate in the Root Medium

FELIX D. DAKORA+,

Botany Department, University of Cape Town, Private Bag, Rondebosch, 7700, Cape Town, South Africa

October 29, 1997 ; November 27, 1997 . June 28, 1998 .

ABSTRACT

Nitrogen-fixing activity in two nodulated African legumes, Bambara groundnut (Vigna subterraneaL.) and Kersting's bean (Macrotyloma geocarpumL.), was assessed in the presence of nitrate (NO3-) ions in the rooting medium. Nitrogenase activity was unimpaired by the supply of 5 mol m-3NO3to both species. Also, large concentrations of ureides dominated the transpiration stream of NO3-fed plants. Compared to other symbiotic legumes cultured with similar NO3concentrations, nodule functioning in the tested landraces of Bambara groundnut and Kersting's bean is tolerant of NO3ions in the rhizosphere. The potential benefits of such naturally occurring NO3-tolerant symbioses are substantial, as they would permit inorganic N fertilizer application in intercropping systems without inhibiting N2fixation in the associated legumes.Copyright 1998 Annals of Botany Company

NO3tolerance, Bambara groundnut, Kersting's bean, nitrogenase activity, xylem ureides.


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