Archives of Microbiology

, Volume 181, Issue 5, pp 337–344

Rhizobium etli maize populations and their competitiveness for root colonization

Original Paper

DOI: 10.1007/s00203-004-0661-9

Cite this article as:
Rosenblueth, M. & Martínez-Romero, E. Arch Microbiol (2004) 181: 337. doi:10.1007/s00203-004-0661-9

Abstract

Rhizobium etli, which normally forms nitrogen-fixing nodules on Phaseolus vulgaris (common bean), is a natural maize endophyte. The genetic diversity of R. etli strains from bulk soil, bean nodules, the maize rhizosphere, the maize root, and inside stem tissue in traditional fields where maize is intercropped with P. vulgaris-beans was analyzed. Based on plasmid profiles and alloenzymes, it was determined that several R. etli types were preferentially encountered as putative maize endophytes. Some of these strains from maize were more competitive maize-root colonizers than other R. etli strains from the rhizosphere or from bean nodules. The dominant and highly competitive strain Ch24-10 was the most tolerant to 6-methoxy-2-benzoxazolinone (MBOA), a maize antimicrobial compound that is inhibitory to some bacteria and fungi. The R. tropici strain CIAT899, successfully used as inoculant of P. vulgaris, was also found to be a competitive maize endophyte in inoculation experiments.

Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Mónica Rosenblueth
    • 1
  • Esperanza Martínez-Romero
    • 1
  1. 1.Centro de Investigación sobre Fijación de NitrógenoUniversidad Nacional Autónoma de MéxicoMorelosMexico

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