Phosphate-solubilizing peanut associated bacteria: screening for plant growth-promoting activities

TANIA, TAURIAN; ANZUAY, S.; ANGELINI, J.; TONELLI, M.; LUDUENA, L.; PENA, D.; IBAÑEZ, F.; FABRA, A.

PLANT AND SOIL

SPRINGER

Año: 2010 vol. 329 p. 421 - 431

0032-079X

In the present study, attemps were made to identify the potential of bacterial strains for promoting Arachis hypogaea L. growth. Four hndred and thirty three bacteria were isolated from rhizosphere, phyllosphere and plant tissues from peanut cultivated in the productin area of Cordoba, Argentina. From this collection, 37 epiphytic isolates and 73 endophytic isolates were selected on the basis of tricalcium phosphate solubilizing activity.These isolates were further tested for other plant growth-promoting attributes and some of them evaluated to examine the effect of inoculation on peanut growth. Siderophore production was observed in a high percentage of the isolates, especially in the root nodule endophytes. Antibiosis was evaluated agains the phytopathogen fungus sclerotinia minors and S. sclerotiorum. Endophytes from nodules showed the highest levels of fungal growth inhibition. A lownumber of isolates was able to produce auxin like molecules and inoculation of peanut seedlings with these bacteria showed variability.