Nodulation in peanut (Arachis hypogaea L.) roots in the presence of native and inoculated rhizobia strains

CASTRO, S.; PERMIGIANI,M.; VINOCUR,M.; FABRA, ADRIANA

APPLIED SOIL ECOLOGY

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 1999 vol. 13 p. 39 - 44

0929-1393

There is considerable interest in improving nitrogen ®xation in legumes to increase soil fertility, particularly in the developingcountries. The effect of inoculation of peanut (Arachis hypogaea L.) seed with Bradyrhizobium sp. USDA 3187 was examinedunder ®eld conditions. In order to determine nodule occupancy, bacterial cells from surface-sterilized nodules of inoculatedplants were isolated and characterized by their intrinsic antibiotic resistance and by agglutination test. Results obtainedrevealed that peanut roots were nodulated by native strain rather than the introduced one, indicating that strain USDA 3187was not as competitive as naturalized peanut rhizobia. Data also showed that there were no signi®cant differences in noduledry weight, plant dry biomass, nitrogenase activity and seed yield between uninoculated and inoculated treatments