G. O’Hara

Publications164
h-index33
Citations3,212
Highly Influential Citations160
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Changing roles for legumes in Mediterranean agriculture: developments from an Australian perspective
TLDR
Examining the factors influencing legume usage in Mediterranean agriculture and the changing focus on legumes in southern Australia is used to illustrate new roles for legume in evolving farming systems shows that root-nodule bacteria are important in maximising productivity in these systems.
Maintenance of Intracellular pH and Acid Tolerance in Rhizobium meliloti
TLDR
The ability to generate a large pH gradient under acid conditions may be a better indicator of acid tolerance in R. meliloti under field conditions than is growth on acidic agar plates.
The model legume Medicago truncatula A17 is poorly matched for N2 fixation with the sequenced microsymbiont Sinorhizobium meliloti 1021.
Medicago truncatula (barrel medic) A17 is currently being sequenced as a model legume, complementing the sequenced root nodule bacterial strain Sinorhizobium meliloti 1021 (Sm1021). In this study,…
Microvirga lupini sp. nov., Microvirga lotononidis sp. nov. and Microvirga zambiensis sp. nov. are alphaproteobacterial root-nodule bacteria that specifically nodulate and fix nitrogen with…
TLDR
Three novel species of Microvirga are proposed on the basis of genotypic, phenotypic and DNA relatedness data, and concatenated sequences show that the sequences of Lut6(T), WSM3557(T) and WSM3693 (T) were most closely related to that of Rhizobium etli CFN42(T).
Nutritional constraints on root nodule bacteria affecting symbiotic nitrogen fixation: a review
TLDR
An integration of molecular approaches with more traditional biochemical, physiological and field-based studies is needed to improve understanding of the agricultural importance of rhizobia response to nutrient stress.
Ferroplasma cupricumulans sp. nov., a novel moderately thermophilic, acidophilic archaeon isolated from an industrial-scale chalcocite bioleach heap
A new species of Archaea was isolated from an industrial mineral sulphide bioleach heap. Strain BH2, a non-motile pleomorphic coccus, was capable of chemomixotrophic growth on ferrous sulphate and…
Mesorhizobium ciceri biovar biserrulae, a novel biovar nodulating the pasture legume Biserrula pelecinus L.
TLDR
Significant differences were revealed between the Biserrula mesorhizobia and M. ciceri in growth conditions, antibiotic resistance and carbon source utilization, and warrant the proposal of a novel biovar for BiserRula mesOrhizobium cicera biserrulae.
Mineral constraints to nitrogen fixation
TLDR
It is concluded that the whole legume-Rhizobium symbiosis should be considered when improving legume growth and yield under nutrient stress conditions.
Rapid In Situ Evolution of Nodulating Strains for Biserrula pelecinus L. through Lateral Transfer of a Symbiosis Island from the Original Mesorhizobial Inoculant
TLDR
Diverse rhizobia able to nodulate Biserrula pelecinus evolved following in situ transfer of nodA and nifH from an inoculant to soil bacteria, indicating that there was lateral transfer of a symbiosis island.
Bradyrhizobium manausense sp. nov., isolated from effective nodules of Vigna unguiculata grown in Brazilian Amazonian rainforest soils.
TLDR
Analysis of the 16S rRNA gene sequences of six strains isolated from cowpea nodules showed that they formed a distinct group within the genus Bradyrhizobium, which was separate from previously identified type strains.
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