Num 29 March 2010.    POLIBOTANICA 29:131-147

ISSN 1405-2768

EVALUATION OF GROWTH PROMOTION OF CYNODON DACTYLON L., BY PHYTOHORMONE-PRODUCING RHIZOBACTERIA ISOLATED FROM SOIL CONTAMINATED WITH PETROLEUM HYDROCARBONS

Adriana Rojas Contreras, Angélica Ma. Rodríguez Dorantes, Silvano Montes Villafán, Sandra Pérez Jiménez

Lab. Fisiología Vegetal, Departamento de Botánica, Escuela Nacional de Ciencias Biológicas, IPN, Prol. Carpio y Plan de Ayala s/n. CP 11340, México, DF Correo electrónico: anrodo2000@hotmail.com

Aída Rodríguez Tovar

Lab. Micología Médica, Departamento de Microbiología, Escuela Nacional de Ciencias Biológicas, IPN, Prol. Carpio y Plan de Ayala s/n. CP 11340, México, DF

L. Angélica Guerrero Zúñiga

Dirección de Seguridad y Medio Ambiente, Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas 152, CP 07730, México, DF

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.

Key words: indoleacetic acid, plant growth-promoting rhizobacteria,Cynodon dactylon.

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