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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Partner choice in medicago truncatulasinorhizobium symbiosis
Proceedings of the Royal Society B: Biological Sciences, Volume 277, No. 1690, Year 2010
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Description
In nitrogen-fixing symbiosis, plant sanctions against ineffective bacteria have been demonstrated in previous studies performed on soybean and yellow bush lupin, both developing determinate nodules with Bradyrhizobium sp. strains. In this study, we focused on the widely studied symbiotic association Medicago truncatula-Sinorhizobium meliloti, which forms indeterminate nodules. Using two strains isolated from the same soil and displaying different nitrogen fixation phenotypes on the same fixed plant line, we analysed the existence of both partner choice and plant sanctions by performing split-root experiments. By measuring different parameters such as the nodule number, the nodule biomass per nodule and the number of viable rhizobia per nodule, we showed that M. truncatula is able to select rhizobia based on recognition signals, both before and after the nitrogen fixation step. However, no sanction mechanism, described as a decrease in rhizobia fitness inside the nodules, was detected. Consequently, even if partner choice seems to be widespread among legumes, sanction of non-effective rhizobia might not be universal. © 2010 The Royal Society.
Authors & Co-Authors
Gubry-Rangin, Cécile
Morocco, Agdal Rabat
Ird
France, Montpellier
Université de Montpellier
United Kingdom, Aberdeen
University of Aberdeen
Garcia, Marjorie
France, Montpellier
Laboratoire Des Symbioses Tropicales et Méditerranéennes
Béna, Gilles
Morocco, Agdal Rabat
Ird
Morocco, Rabat
Faculté Des Sciences Rabat
Statistics
Citations: 78
Authors: 3
Affiliations: 5
Identifiers
Doi:
10.1098/rspb.2009.2072
ISSN:
09628452