Neighbourhood effect of genotypes of Rhizobium leguminosarum biovar trifolii, Trifolium repens and Lolium perenne |
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Authors: | J M Expert P Jacquard M Obaton A Lu¨scher |
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Institution: | Centre Louis Emberger, CNRS, Route de Mende, BP 5051, 34033 Montpellier Cedex, France, FR Laboratoire de Recherche sur les Symbiotes des Racines, INRA, 1 place Pierre Viala, 34060 Montpellier Cedex 1, France, FR Eidgen?ssische Technische Hochschule, Institut für Pflanzenwissenschaften, ETH-Zentrum, 8092 Zürich, Switzerland, CH
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Abstract: | Ryegrass, white clover and Rhizobium isolated from the corresponding clover nodules, were harvested from a natural pasture in the Massif Central mountains (France).
The specificity between Lolium, Trifolium and Rhizobium, and the genetic diversity of Rhizobium were examined. This study showed that:
1) Natural neighbouring combinations of white clover and ryegrass, re-planted together in pots, accumulated a higher biomass
than non-neighbouring ones. This increase of mass is higher in the presence of the native strain of Rhizobium.
2) When white clover was inoculated with a mixture of Rhizobium strains, nodules were more often formed by its native strain.
3) The genetical diversity of the Rhizobium leguminosarum biovar trifolii was very high, as revealed by electrophoresis of esterases on seven substrates.
These results support the hypothesis that there is a co-adaptation between white clover, ryegrass and Rhizobium
Received: 25 March 1996 / Accepted: 13 September 1996 |
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Keywords: | Rhizobium leguminosarum biovar trifolii Trifolium repens L Lolium perenne L Co-adaptation Esterase |
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