Details

Autor(en) / Beteiligte

• Mantelin, S
• Touraine, B

Titel

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

Ist Teil von

• Journal of experimental botany, 2004-01, Vol.55 (394), p.27-34

Ort / Verlag

England: Oxford University Press

Erscheinungsjahr

2004

Link zum Volltext

Quelle

EZB-FREE-00999 freely available EZB journals

Beschreibungen/Notizen

• Plant growth-promoting bacteria (PGPB) and NO3(-) availability both affect NO3(-) uptake and root architecture. The presence of external NO3(-) induces the expression of NO3(-) transporter genes and elicits lateral root elongation in the part of the root system exposed to the NO3(-) supply. By contrast, an increase in NO3(-) supply leads to a higher plant N status (low N demand), which represses both the NO3(-) transporters and lateral root development. The effects of PGPB on NO3(-) uptake and root development are similar to those of low NO3(-) availability (concomitant stimulation of NO3(-) uptake rate and lateral root development). The mechanisms responsible for the localized and long-distance regulation of NO3(-) uptake and root development by NO3(-) 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 NO3(-) availability and PGPB on root morphogenesis and NO3(-) uptake, in order to determine whether interactions exist between the NO3(-)-dependent and the PGPB-dependent regulatory pathways.