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

TANIA TAURIAN, MARÍA SOLEDAD ANZUAY, JORGE GUILLERMO ANGELINI, MARÍA LAURA TONELLI, LILIANA LUDUEÑA, DAYANA PENA, FERNANDO IBAÑEZ, ADRIANA FABRA

PLANT AND SOIL

SPRINGER

Año: 2010 vol. 329 p. 421 - 431

0032-079X

Abstract  In the present study, attempts were made to identify the potential of bacterial strains for promotingArachis hypogaea L. growth. Four hundred and thirty three bacteria were isolated from rhizosphere, phyllosphere and plant tissues from peanuts cultivated in the producing 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 against the phytopathogen fungus Sclerotinia minor and S. Sclerotiorum. Endophytesfrom nodules showed the highest levels of fungal growth inhibition. A low number of isolates was able to produce auxin like molecules and inoculation of peanut seedlings with these bacteria showed variability