Characterization of genotypic variability associated to the phosphorus bioavailability in peanut (Arachis hypogaea L.)

In order to assess genotypic variability in some peanut genotypes depending on phosphorus availability, both effects of tri-calcium phosphate (TCP) and inoculation by Bradyrhizobium strain (BR) on morphological and physiological parameters were studied in five peanut genotypes (Arachis hypogaea L.), originated from two Algerian areas (Northern and Southern). The results obtained during the flowering stage of crop development, confirmed the positive effect of the contribution of tri-calcium phosphate (TCP) with Bradyrhizobium strains on the morphological characters (shoot biomass, root biomass, nodular biomass and leaf) and the physiological (nitrogenase activity, phosphorus absorption efficiency by roots (RPAE) and phosphorus use efficiency (PUE)) for the peanut genotypes cultivated in this experiment. Among five genotypes tested, it was noted that the Southern genotypes were more efficient to use TCP in the presence of Bradyrhizobium strain after a screening of these local genotypes, in particular, with phosphorus use efficiency (PUE) and shoot biomass production.