Bradyrhizobia nodulating the Acacia mangium x A. auriculiformis interspecific hybrid are specific and differ from those associated with both parental species

Le Roux Christine, Tentchev Diana, Prin Yves, Goh Doreen Kim Soh, Japarudin Yani, Perrineau Marie-Mathilde, Duponnois Robin, Domergue Odile, De Lajudie Philippe, Galiana Antoine. 2009. Bradyrhizobia nodulating the Acacia mangium x A. auriculiformis interspecific hybrid are specific and differ from those associated with both parental species. Applied and Environmental Microbiology, 75 (24) : 7752-7759.

https://doi.org/10.1128/AEM.01887-09

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Quartile : Q1, Sujet : BIOTECHNOLOGY & APPLIED MICROBIOLOGY / Quartile : Q2, Sujet : MICROBIOLOGY

Résumé : In the context of an increasing utilization of the interspecific hybrid Acacia mangium x A. auriculiformis as a plantation tree in the tropical humid zone, its symbiotic characterization was carried out in comparison with that of its two parental species. Rhizobium strains of diverse geographical origins were isolated from root nodules of the hybrid and its parents. Almost all Acacia hybrid isolates were fast growing on yeast extractmannitol medium, in contrast to those isolated from both parental species, which were mostly slow growing. The rhizobium strains were characterized through partial sequencing of the rRNA operon. In the phylogenetic tree, almost all strains isolated from the hybrid were grouped together in a clade close to Bradyrhizobium japonicum, while all strains isolated from both parental species were close to Bradyrhizobium elkanii. Inoculation experiments performed under in vitro or greenhouse conditions showed that all strains were infective with their original hosts but exhibited very variable degrees of effectivity according to the host plant tested. Thus, homologous strain-host associations were more effective than heterologous ones. This shows that there is still a high potential for isolating and testing new strains from hybrids to be used as inoculants in the context of large-scale afforestation programs.

Mots-clés Agrovoc : Acacia auriculiformis, Acacia mangium, Bradyrhizobium

Mots-clés géographiques Agrovoc : Malaisie, Australie

Mots-clés complémentaires : Hybride interspécifique

Classification Agris : P34 - Biologie du sol
F62 - Physiologie végétale - Croissance et développement
K10 - Production forestière

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

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