Changing roles for legumes in Mediterranean agriculture: developments from an Australian perspective
Nutritional constraints on root nodule bacteria affecting symbiotic nitrogen fixation: a review
- G. O’Hara
- 3 May 2001
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.
Maintenance of Intracellular pH and Acid Tolerance in Rhizobium meliloti
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.
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…
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).
The model legume Medicago truncatula A17 is poorly matched for N2 fixation with the sequenced microsymbiont Sinorhizobium meliloti 1021.
- J. Terpolilli, G. O’Hara, R. Tiwari, M. Dilworth, J. Howieson
- Biology, MedicineNew Phytologist
- 1 July 2008
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,…
Inoculating legumes: a practical guide
Elizabeth Drew, David Herridge, Ross Ballard, Graham O’Hara, Rosalind Deaker, Matthew Denton, Ron Yates, Greg Gemell, Elizabeth Hartley, Lori Phillips, Nikki Seymour, John Howieson and Neil Ballard
Rapid In Situ Evolution of Nodulating Strains for Biserrula pelecinus L. through Lateral Transfer of a Symbiosis Island from the Original Mesorhizobial Inoculant
- K. Nandasena, G. O’Hara, R. Tiwari, J. Howieson
- BiologyApplied and Environmental Microbiology
- 25 August 2006
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.
Enhanced nodulation and symbiotic effectiveness of Medicago truncatula when co-inoculated with Pseudomonas fluorescens WSM3457 and Ensifer (Sinorhizobium) medicae WSM419
This study investigated the effect of co-inoculation with a helper bacterium, Pseudomonas fluorescens WSM3457 on the Medicago truncatula - Ensifer (Sinorhizobium) medicae WSM419 symbiosis challenged by a low inoculum dose.
Mesorhizobium ciceri biovar biserrulae, a novel biovar nodulating the pasture legume Biserrula pelecinus L.
- K. Nandasena, G. O’Hara, R. Tiwari, Anne Willlems, J. Howieson
- BiologyInternational Journal of Systematic and…
- 1 May 2007
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
It is concluded that the whole legume-Rhizobium symbiosis should be considered when improving legume growth and yield under nutrient stress conditions.