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Co-inoculation with Bacillus sp. CECT 450 improves nodulation in Phaseolus vulgaris L.

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The strain Bacillus sp. CECT 450 increased nodulation on bean (Phaseolus vulgaris L.) when co-inoculated with Rhizobium tropici CIAT 899. This positive effect occured under controlled conditions on perlite–vermiculite, sand, or in a mixture of soil and sand. This increase was also observed in a field assay. Nodulation kinetic studies suggested that the synergistic effect is pronounced during the latter stages of cultivation. In contrast, the same bacteria co-inoculated with Bradyrhizobium japonicum USDA 110 reduced nodulation on soybean (Glycine max (L.) Merr.). Inoculation with Bacillus sp. CECT 450 alone had no effect on bean plants, but reduced root growth in soybean. The survival of Bacillus sp. CECT 450 on inoculated seeds was high, even when inoculated seeds were maintained for several months at room temperature.Key words: Rhizobium spp., Bacillus sp., Phaseolus vulgaris, nodulation, co-inoculation.

La souche de Bacillus sp. CECT 450 a augmenté la formation de nodules chez l'haricot (Phaseolus vulgaris L.) commun lorsqu'elle était co-inoculée avec le Rhizobium tropici CIAT 899. Cet effet de synergie a été observé dans des conditions contrôlées avec un substrat inerte (perlite-vermiculite) ainsi que dans du sable ou dans un mélange de sable et de terre. Cette augmentation a aussi été observée dans une expérience au champ. La cinétique de la formation des nodules indique que l'effet synergique était plus prononcé durant les dernières étapes de la culture. À l'inverse, cette même souche a entraîné une diminution de la formation de nodules chez le soja (Glycine max (L.) Merr.) lorsqu'elle était co-inoculée avec le Bradyrhizobium japonicum USDA 110. L'inoculation du Bacillus sp. CECT 450 seul n'a pas eu d'effet chez l'haricot mais elle causait une diminution du système racinaire chez le soja. La survie du Bacillus sp. CECT 450 sur des graines inoculées était très élevée même après plusieurs mois de conservation à la température ambiante.Mots clés : Rhizobium spp., Bacillus sp., Phaseolus vulgaris, formation de nodules, co-inoculation.[Traduit par la Rédaction]

Keywords: Rhizobium spp

Document Type: Research Article

Publication date: November 1, 2001

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  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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