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Vincent B., Juillot Farid, Fritsch Emmanuel, Klonowska Agnieszka, Gerbert N., Acherar S., Grangeteau C., Hannibal Laure, Galiana A., Ducousso M., Jourand Philippe. (2019). A leguminous species exploiting alpha- and beta-rhizobia for adaptation to ultramafic and volcano-sedimentary soils : an endemic Acacia spirorbis model from New Caledonia. FEMS Microbiology Ecology, 95 (8), p. fiz099 [15 p.]. ISSN 0168-6496.

Titre du document
A leguminous species exploiting alpha- and beta-rhizobia for adaptation to ultramafic and volcano-sedimentary soils : an endemic Acacia spirorbis model from New Caledonia
Année de publication
2019
Type de document
Article référencé dans le Web of Science WOS:000484392400004
Auteurs
Vincent B., Juillot Farid, Fritsch Emmanuel, Klonowska Agnieszka, Gerbert N., Acherar S., Grangeteau C., Hannibal Laure, Galiana A., Ducousso M., Jourand Philippe
Source
FEMS Microbiology Ecology, 2019, 95 (8), p. fiz099 [15 p.] ISSN 0168-6496
Acacia spirorbis subsp. spirorbis Labill. is a widespread tree legume endemic to New Caledonia that grows in ultramafic (UF) and volcano-sedimentary (VS) soils. The aim of this study was to assess the symbiotic promiscuity of A. spirorbis with nodulating and nitrogen-fixing rhizobia in harsh edaphic conditions. Forty bacterial strains were isolated from root nodules and characterized through (i) multilocus sequence analyses, (ii) symbiotic efficiency and (iii) tolerance to metals. Notably, 32.5% of the rhizobia belonged to the Paraburkholderia genus and were only found in UF soils. The remaining 67.5%, isolated from both UF and VS soils, belonged to the Bradyrhizobium genus. Strains of the Paraburkholderia genus showed significantly higher nitrogen-fixing capacities than those of Bradyrhizobium genus. Strains of the two genera isolated from UF soils showed high metal tolerance and the respective genes occurred in 50% of strains. This is the first report of both alpha- and beta-rhizobia strains associated to an Acacia species adapted to UF and VS soils. Our findings suggest that A. spirorbis is an adaptive plant that establishes symbioses with whatever rhizobia is present in the soil, thus enabling the colonization of contrasted ecosystems.
Plan de classement
Biotechnologies [084]
Description Géographique
NOUVELLE CALEDONIE
Localisation
Fonds IRD [F B010076672]
Identifiant IRD
fdi:010076672
Contact