EVALUACIÓN DE LA PROMOCIÓN DEL CRECIMIENTO DE CYNODON DACTYLON L. POR RIZOBACTERIAS PRODUCTORAS DE FITOHORMONAS AISLADAS DE UN SUELO CONTAMINADO CON HIDROCARBUROS DERIVADOS DEL PETRÓLEO

Abstract

The selection of plant growth-promoting
rhizobacteria (PGPR) can be based on the
in vitro analysis of their auxin-producing
and growth-promoting capabilities. This
study determined the intrinsic production
of indole acetic acid (IAA) by rhizobacteria
isolated from petroleum-contaminated soil
and tested its potential for growth promotion. The three isolated rhizobacteria (I,
II and III) were high producers of indole
acetic acid in vitro. Cynodon dactylon
L. was inoculated with these isolates in
hydroponic systems. The Rhizobacterium
spp. strains I and II showed plant growth
promotion without the addition of Trp (a
common precursor in the biosynthesis of
IAA), whereas strain III required the addition of Trp to promote foliar development
in C. dactylon.