Flamingo is a new common bean (Phaseolus vulgaris L.)
genotype with tolerance of symbiotic nitrogen fixation to
2, 3*, Jean-Jacques Drevon1 and Mustapha
UMR Eco and Sols, place Viala, 34060 Montpellier Cedex 01,
Supérieure d’Agriculture de Mateur, Bizerte, 7030, Tunisie.
des Sciences de Gafsa, 2112 Sidi Ahmed Zarroug, Tunisie.
email@example.com. Tel: +216 94120093.
Accepted 1 March, 2012
Salinity is one of the major environmental threats to
agriculture. In particular, soil salinization is a major
limiting factor of symbiotic nitrogen fixation for legume
growth. The adverse effects of salinity on the rhizobial
symbiosis of common bean genotypes CocoT and Flamingo and
the subsequent photosynthesis and plant-growth were
investigated in glasshouse. Common bean plants were grown in
and irrigated with salt concentrations of 2, 4, 6, 8 and 10
gl-1, respectively and inoculated with
rhizobial strains of Rhizobium tropici CIAT899 or
Rhizobium etli 12a3. Nodule number and biomass, shoot
content of nitrogen and chlorophyll were decreased by
increasing salinity with all used symbiosis, whereas, the
proline accumulation increased. The interaction between
symbioses and salt levels for all parameters was highly
significant. Overall, Flamingo inoculated with R. etli
had the highest plant growth and nitrogen fixation under
salinity. It is concluded that Flamingo has potential for
application in field conditions exposed to soil salinization
or irrigated with saline water, unless native rhizobial
would interact negatively.
Legume, mediterranean area, rhizobia, salinity.