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JXB Advance Access published online on November 17, 2003
Journal of Experimental Botany, doi:10.1093/jxb/erh010
© 2003 by Oxford University Press
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Received May 19, 2003; accepted August 11, 2003
© 2003 Society for Experimental Biology

FOCUS PAPER

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

Sophie Mantelin 1 and Bruno Touraine 1*

1 Université 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. E-mail: touraine{at}univ-montp2.fr.


  Abstract

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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