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| Titel |
Bradyrhizobium-Lupinus mariae-josephae: a unique symbiosis endemic of a basic soil in Eastern Spain |
| VerfasserIn |
D. Durán, C. Sánchez-Cañizares, A. Navarro, L. Rey, J. Imperial, T. Ruiz-Argüeso |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250062305
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| Zusammenfassung |
| Lupinus mariae-josephae is an intriguing lupine species recently discovered in the
Mediterranean region and constitutes an endemism of a small area of Eastern Spain (Valencia
province; Pascual, 2004; Mahé et al. 2011). It opens new perspectives for ecological and
agronomic interests, as it represents the sole lupine species that preferentially grows in basic
soils, while almost all other lupine species occur in acid to neutral soils. The L.
mariae-josephae symbionts isolated from soils of calcareous areas of Valencia are extremely
slow-growing bacteria belonging to the Bradyrhrizobium genus and showing symbiotic
specificity that prevents nodulation of other Lupinus spp. such as L. angustifolius or L. luteus
typically thriving in acid soils (Sanchez-Cañizares et al, 2011). Their phylogenetic analysis
based on housekeeping and symbiotic genes showed that L. mariae-josephae symbionts
belong to an evolutionary lineage that also includes endosymbiotic bacteria from Retama
spp. of Northern Algeria basic soils (Boulila et al. 2009). Conversely, this new
lineage is phylogenetically distinct from that of endosymbiotic bacteria from other
Lupinus spp. native of the Iberian Peninsula, which were nested mainly within B.
canariense and B. japonicum lineages. A genomic diversity study of the indigenous
bradyrhizobia population of the calcareous areas in Valencia, based on fingerprint and
phylogenetic analysis, showed the existence of a large diversity of genotypes, some
of which are related to bacteria from the Retama spp. symbiosis in Algeria. This
singular genomic divergence of L. mariae-josephae symbiotic bacteria in such a small
geographical area fosters attractive studies on the origin, ecology and evolution
of both partners of the symbiosis. Furthermore, it is expected that ongoing seed
inoculation experiments with selected strains will allow us to extend the extant
distribution spots of L. mariae-josephae plants in Valencia area, and also to determine
whether the observed edaphic restrictions represent a limitation to the expansion of L.
mariae-josephae crops to wide areas of poor calcareous soils in the Mediterranean
region.
Work supported by FBBVA Contract BIOCON08-078 to TRA and MICINN Project
CGL2011-26932 to JI.
Mahé et al. 2010 Genet Resour Crop Evol 58, 101-114.
Pascual, H. 2004 Anal Jardín Botán Madrid 61(1): 69-72.
Sánchez-Cañizares et al 2011 Syst Appl Microbiol 34 207–215
Boulila et al 2009 Syst. Appl. Microbiol. 32, 245–255. |
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