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JXB Advance Access originally published online on November 17, 2003
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Journal of Experimental Botany, Vol. 55, No. 394, pp. 27-34, January 1, 2004
© 2004 Oxford University Press

Plant Carbon-Nitrogen Interactions from Rhizospheres to Planet

Plant growth-promoting bacteria and nitrate availability: impacts on root development and nitrate uptake

Received 19 May 2003; Accepted 11 August 2003

Sophie Mantelin and Bruno Touraine*

1Université Montpellier II, Laboratoire des Symbioses Tropicales et Méditerranéennes, UMR 113 UM2/IRD/CIRAD/INRA/ENSAM, CC 02, Place E Bataillon, 34095 Montpellier cedex 05, France

* To whom correspondence should be addressed. Fax: +33 4 6714 3637. E-mail: touraine{at}univ-montp2.fr

Plant growth-promoting bacteria (PGPB) and NO–3 availability both affect NO–3 uptake and root architecture. The presence of external NO–3 induces the expression of NO–3 transporter genes and elicits lateral root elongation in the part of the root system exposed to the NO–3 supply. By contrast, an increase in NO–3 supply leads to a higher plant N status (low N demand), which represses both the NO–3 transporters and lateral root development. The effects of PGPB on NO–3 uptake and root development are similar to those of low NO–3 availability (concomitant stimulation of NO–3 uptake rate and lateral root development). The mechanisms responsible for the localized and long-distance regulation of NO–3 uptake and root development by NO–3 availability are beginning to be elucidated. By contrast, the signalling and transduction pathways elicited by the rhizobacteria remain totally unknown. This review will compare the effects of NO–3 availability and PGPB on root morphogenesis and NO–3 uptake, in order to determine whether interactions exist between the NO–3-dependent and the PGPB-dependent regulatory pathways.

Key words: N demand, nitrate uptake, plant growth-promoting bacteria, plasticity, rhizosphere, root development.


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