Abstract
Root nodule bacteria isolated from native legumes in various biogeographical areas have demonstrated that rhizobia are more phylogenetically diverse than originally supposed. We present here an overview of our studies on novel species, isolated from nodules of legume hosts in Australia and Africa, which are affiliated to Burkholderia, Methylobacterium and Microvirga. The microsymbionts’ physiological adaptations to their environment, host specificity and phylogeny of nodulation and nitrogen fixation genes were examined, along with the modes of plant infection and nodule formation. Important findings include the apparent adaptation of Burkholderia spp. to infertile soils of wide pH range, the confirmation of specificity in the non-root hair-mediated Lotononis/Methylobacterium symbiosis and the potential of legume nodule morphology as a taxonomic aid. These species’ inclusion in the Genomic Encyclopedia for Bacteria and Archaea sequencing project will aid elucidation of the diverse rhizobial genomic architecture that underlies symbiotic ability and specificity.
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Claims 4
Claim · model-written summary
Rhizobia from native legumes were more phylogenetically diverse than previously supposed.
Verbatim
e0“Root nodule bacteria isolated from native legumes in various biogeographical areas have demonstrated that rhizobia are more phylogenetically diverse than originally supposed”
Claim · model-written summary
Burkholderia species apparently adapted to infertile soils across a wide pH range.
- Taxon
- legumet0
- Interactor
- Burkholderia spp.
Burkholderiae0symbiont - Outcome
- adaptation of Burkholderia spp. to infertile soils of wide pH rangee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“apparent adaptation of Burkholderia spp. to infertile soils of wide pH range”
t0“Novel genera of root nodule bacteria demonstrate the microsymbiont diversity of the legume/rhizobia symbiosis”
Claim · model-written summary
Specificity was confirmed in the non-root hair mediated Lotononis/Methylobacterium symbiosis.
- Interactor
- MethylobacteriumMethylobacteriume0symbiont
- Outcome
- specificity in the non-root hair-mediated Lotononis/Methylobacterium symbiosise0
LotononisOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“confirmation of specificity in the non-root hair-mediated Lotononis/Methylobacterium symbiosis”
Claim · model-written summary
Legume nodule morphology may aid taxonomy.
Not reportedComparatorValue
Verbatim
e0“potential of legume nodule morphology as a taxonomic aid”