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Effect of salinity on root-nodule conductance to the oxygen diffusion in the Cicer arietinum-Mesorhizobium ciceri symbiosis.
- Source :
-
Journal of plant physiology [J Plant Physiol] 2007 Aug; Vol. 164 (8), pp. 1028-36. Date of Electronic Publication: 2006 Aug 10. - Publication Year :
- 2007
-
Abstract
- Nodule conductance to O2 diffusion has been involved as a major factor of the inhibition of N2 fixation by soil salinity that severely reduces the production of grain legumes. In order to determine the effect of this constraint on the nodule conductance, oxygen uptake by the nodulated roots of Cicer arietinum was measured by recording the concentration of O2 as a function of pO2 in a gas-tight incubator. After germination and inoculation with the strain Mesorhizobium ciceri UPMCa7, the varieties Amdoun 1 and INRAT 93-1 were hydroponically grown in a glasshouse on 1L glass bottles filled with nutrient solution containing 25 mM NaCl. Salinity induced a marked decrease in shoot (30% versus 14%), root (43% versus 20%), and nodule biomass (100% versus 43%) for Amdoun 1 relative to INRAT 93-1. Although salinity completely prevented nodule formation in the sensitive variety Amdoun 1, nodule number and biomass were higher in the first than in the second variety in the absence of salt. This effect was associated with a significantly higher O2 uptake by nodulated root (510 versus 255 micromol O2 plant(-1)h(-1)) and nodule conductance (20 versus 5 microm s(-1)) in Amdoun 1 than in INRAT 93-1. Salinity did not significantly change the nodule conductance and nodule permeability for INRAT 93-1. Thus, the salt tolerance of this variety appears to be associated with stability in nodule conductance and the capacity to form nodules under salt constraint.
- Subjects :
- Biomass
Cicer drug effects
Cicer microbiology
Kinetics
Plant Roots drug effects
Plant Roots microbiology
Plant Shoots growth & development
Rhizobium drug effects
Cicer growth & development
Oxygen Consumption
Plant Roots growth & development
Rhizobium growth & development
Sodium Chloride pharmacology
Subjects
Details
- Language :
- English
- ISSN :
- 0176-1617
- Volume :
- 164
- Issue :
- 8
- Database :
- MEDLINE
- Journal :
- Journal of plant physiology
- Publication Type :
- Academic Journal
- Accession number :
- 16904230
- Full Text :
- https://doi.org/10.1016/j.jplph.2006.05.016