Publications: O'Hara, Graham
2012
Gerding, M., O'Hara, G.W., Bräu, L., Nandasena, K. and Howieson, J.G. (2012) Diverse Mesorhizobium spp. with unique nodA nodulating the South African legume species of the genus Lessertia. Plant and Soil, 358 (1-2). pp. 385-401.
Melino, V.J., Drew, E.A., Ballard, R.A., Reeve, W.G., Thomson, G., White, R.G. and O'Hara, G.W. (2012) Identifying abnormalities in symbiotic development between Trifolium spp. and Rhizobium leguminosarum bv. trifolii leading to sub-optimal and ineffective nodule phenotypes. Annals of Botany, 110 (8). pp. 1559-1572.
Ardley, J.K., Parker, M.A., De Meyer, S.E., Trengove, R.D., O'Hara, G.W., Reeve, W.G., Yates, R.J., Dilworth, M.J., Willems, A. and Howieson, J.G. (2012) 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 geographically and taxonomically separate legume hosts. International Journal of Systematic and Evolutionary Microbiology, 62 (11). pp. 2579-2588.
2011
Fox, S.L., O'Hara, G.W. and Bräu, L. (2011) Enhanced nodulation and symbiotic effectiveness of Medicago truncatula when co-inoculated with Pseudomonas fluorescens WSM3457 and Ensifer (Sinorhizobium) medicae WSM419. Plant and Soil, 348 (1-2). pp. 245-254.
Yates, R.J., Howieson, J.G., Reeve, W.G. and O'Hara, G.W. (2011) A re-appraisal of the biology and terminology describing rhizobial strain success in nodule occupancy of legumes in agriculture. Plant and Soil, 348 (1-2). pp. 255-267.
2010
Reeve, W.G., O'Hara, G.W., Chain, P., Ardley, J.K., Bräu, L., Nandasena, K.G., Tiwari, R., Malfatti, S., Kiss, H., Lapidus, A., Copeland, A., Nolan, M., Land, M., Ivanova, N., Mavromatis, K., Markowitz, V., Kyrpides, N, Melino, V., Denton, M., Yates, R.J. and Howieson, J.G. (2010) Complete genome sequence of Rhizobium leguminosarum bv trifolii strain WSM2304, an effective microsymbiont of the South American clover Trifolium polymorphum. Standards in Genomic Sciences, 2 (1). pp. 66-76.
Reeve, W.G., O'Hara, G.W., Chain, P., Ardley, J.K., Bräu, L., Nandasena, K.G., Tiwari, R., Copeland, A., Nolan, M., Han, Cliff, Brettin, T., Land, M., Ovchinikova, G., Ivanova, N., Mavromatis, K., Markowitz, V., Kyrpides, N., Melino, V., Denton, M., Yates, R.J. and Howieson, J. (2010) Complete genome sequence of Rhizobium leguminosarum bv. trifolii strain WSM1325, an effective microsymbiont of annual Mediterranean clovers. Standards in Genomic Sciences, 2 (3). pp. 347-356.
Reeve, W.G., Chain, P., O'Hara, G.W., Ardley, J.K., Nandasena, K.G., Bräu, L., Tiwari, R., Malfatti, S., Kiss, H., Lapidus, A., Copeland, A., Nolan, M., Land, M., Hauser, L., Chang, Y-J, Ivanova, N., Mavromatis, K., Markowitz, V., Kyrpides, N, Gollagher, Margaret, Yates, R.J., Dilworth, M.J. and Howieson, J.G. (2010) Complete genome sequence of the Medicago microsymbiont Ensifer (Sinorhizobium) medicae strain WSM419. Standards in Genomic Sciences, 2 (1). pp. 77-86.
Ardley, J.K., Garau, G., Yates, R.J., Parker, M.A., O'Hara, G.W., Reeve, W.G., De Meyer, S., Walker, R., Dilworth, M.J., Willems, A., Watkin, E. and Howieson, J.G. (2010) Novel genera of root nodule bacteria demonstrate the microsymbiont diversity of the legume/rhizobia symbiosis. In: 5th International Legumes Conference, 8 - 14 August, Buenos Aires, Argentina .
Ardley, J.K., Parker, M.A., De Meyer, S., O'Hara, G.W., Reeve, W.G., Yates, R.J., Dilworth, M.J., Willems, A. and Howieson, J.G. (2010) Species of Microvirga are novel alpha-proteobacterial root nodule bacteria that specifically nodulate Lotononis angolensis and Lupinus texensis. In: 9th European Nitrogen Fixation Conference, 6 - 10 September, Geneva, Switzerland .
Ardley, J.K., Parker, M., De Meyer, S., O'Hara, G.W., Reeve, W.G., Yates, R.J., Dilworth, M.J., Willems, A. and Howieson, J.G. (2010) Species of Microvirga are novel root nodule bacteria from widely separate biogeographical areas that nodulate and fix nitrogen with a narrow range of legume hosts. In: Australian Nitrogen Fixation Conference, 1 - 7 December, Margaret River, Western Australia.
2009
Tiwari, R.P., Bräu, L., O'Hara, G., Howieson, J.G. and Reeve, W.G. (2009) Acid-adaption by a medic microsymbiont: new insights from the genome of Sinorhizobium medicae WSM419. In: 15th Australian Nitrogen Fixation Conference, 8 - 13 November, Margaret River, Western Australia.
Howieson, J., O'Hara, G.W., Yates, R.J., Garau, G., Ratnayake, S., Ardley, J.K., van Wyk, B-E and Pariot, B. (2009) Burkholderia, Methylobacteria and other lesser exploited RNB as commercial inoculants in temperate agriculture on poor soils. In: The 16th International Congress of Nitrogen Fixation, 14 - 19 June, Big Sky, Montana.
Lee, W.G., Reeve, W.G., O'Hara, G.W. and Tiwari, R.P. (2009) Discerning the roles and relationships of EPS and the stringent response. In: The 16th International Congress of Nitrogen Fixation, 14 - 19 June, Big Sky, Montana.
Gehlot, H.S., Shekhawat, N.S., Tiwari, R., O'Hara, G., Howieson, J. and Sprent, J. (2009) Diversity in native legumes of the Indian Thar Desert and a look into Socio-economic aspect. In: 15th Australian Nitrogen Fixation Conference, 8 - 13 November, Margaret River, Western Australia.
Ardley, J.K., O'Hara, G.W., Reeve, W.G., Yates, R.J., Dilworth, M.J. and Howieson, J.G. (2009) Highly Specific hosts in the Listia section of the Legume Genus Lotononis are nodulated by Methylobacteria and by novel isolates that are a new genus of root nodule bacteria. In: The 16th International Congress of Nitrogen Fixation, 14 - 19 June, Big Sky, Montana.
Nandasena, K.G., O'Hara, G.W., Tiwari, R.P., Willems, A. and Howieson, J.G. (2009) Mesorhizobium australicum sp. nov. and Mesorhizobium opportunistum sp. nov., isolated from Biserrula pelecinus L. in Australia. International Journal of Systematic and Evolutionary Microbiology, 59 (9). pp. 2140-2147.
Bräu, L., Goodwin, L., O'Hara, G.W., Tiwari, R., Howieson, J., Yates, R.J. and Reeve, W. (2009) Mining the sequence data of Rhizobium Leguminosarum BV Trifolii WSM1325 and WM2304. In: The 16th International Congress of Nitrogen Fixation, 14 - 19 June, Big Sky, Montana.
Nandasena, K.G. and O'Hara, G.W. (2009) New understandings in microbial (bacterial) evolution - A review. Journal of the Royal Society of Western Australia, 92 (4). pp. 453-459.
Ardley, J.K., Parker, M.A., De Meyer, S., O'Hara, G.W., Reeve, W.G., Yates, R.J., Dilworth, M.J., Williems, A. and Howieson, J.G. (2009) Nodulation and specificity in the legume genus Lotononis and description of novel Lotononis angolensis isolates. In: 15th Australian Nitrogen Fixation Conference, 8 - 13 November, Margaret River, Western Australia.
Terpolilli, J.J., Reeve, W.G., Bräu, L., Tiwari, R.P., Dilworth, M.J., Howieson, J.G. and O'Hara, G.W. (2009) Role of EXPR and Expolysaccharide production in N2 fixation in the Medicago-Sinorhizobium Symbiosis. In: The 16th International Congress of Nitrogen Fixation, 14 - 19 June, Big Sky, Montana.
Ardley, J.K., O'Hara, G.W., Reeve, W.G., Yates, R.J., Dilworth, M.J., Tiwari, R.P. and Howieson, J.G. (2009) Root nodule bacteria isolated from South African Lotononis bainesii, L. listii and L. solitudinis are species of Methylobacterium that are unable to utilize methanol. Archives of Microbiology, 191 (4). pp. 311-318.
Poonar, N., Tak, N., Parihar, R., Rathore, M.S., Fox, S.L., Swift, R., Gehlot, H.S., Bräu, L., O'Hara, G., Tiwari, R. and Howieson, J. (2009) Screening of root nodule endophytes isolated from native legumes of arid regions of India for their multiple PGP traits. In: 15th Australian Nitrogen Fixation Conference, 8 - 13 November, Margaret River, Western Australia.
Nandasena, K.G., O'Hara, G.W., Reeve, W., Tiwari, R. and Howieson, J.G. (2009) Selfish Islands and converging plasmids - new insights into evolution of root nodule bacteria. In: 15th Australian Nitrogen Fixation Conference, 8 - 13 November, Margaret River, Western Australia.
Burgos, F.A., O'Hara, G.W., Kobryn, H. and Howieson, J. (2009) The application of remote sensing to estimate nitrogen levels across Field Pea genotypes. In: 15th Australian Nitrogen Fixation Conference, 8 - 13 November, Margaret River, Western Australia.
Nandasena, K.G., O'Hara, G.W., Tiwari, R.P. and Howieson, J.G. (2009) A basis for the development of an inferior N2 fixation phenotype in root nodule bacteria following lateral transfer of symbiotic genes. In: The 16th International Congress of Nitrogen Fixation, 14 - 19 June, Big Sky, Montana.
Watkin, E.L.J., Mutch, L.A., Rome, S., Reeve, W.G., Castelli, J.M., Gruchlik, Y., Best, W.M., O'Hara, G.W. and Howieson, J.G. (2009) The effect of acidity on the production of signal molecules by Medicago roots and their recognition by Sinorhizobium. Soil Biology and Biochemistry, 41 (1). pp. 163-169.
2008
Nandasena, K.G., O'Hara, G.W., Tiwari, R.P. and Howieson, J.G. (2008) Gene transfer in the environment promotes the rapid evolution of a diversity of suboptimal and competitive rhizobia for Biserrula pelecinus L. In: Dakora, F.D., Chimphango, S.B. M., Valentine, A.J., Elmerich, C. and Newton, W.E., (eds.) Biological nitrogen fixation: towards poverty alleviation through sustainable agriculture. Springer, New York, pp. 63-64.
Bräu, L., Goodwin, L.A., O'Hara, G.W., Tiwari, R., Howieson, J.G., Yates, R.J. and Reeve, W.G. (2008) Genome features of an annual and a perennial clover microsymbiont. In: 8th European Nitrogen Fixation Conference, 30 August - 3 September, Gent.
Terpolilli, J.J., Tiwari, R.P., Dilworth, M.J., O'Hara, G.W. and Howieson, J.G. (2008) Investigating Nitrogen Fixation in the Medicago-sinorhizobium Symbiosis. In: Dakora, F.D., Chimphango, S.B. M, Valentine, A.J., Elmerich, C. and Newton, W.E., (eds.) Biological Nitrogen Fixation: Towards Poverty Alleviation through Sustainable Agriculture. Springer, New York, p. 145.
Reeve, W.G., Chain, P., Tiwari, R., O'Hara, G.W., Howieson, J.G. and Bräu, L. (2008) The Sinorhizobium medicae WSM419 genome sequencing project. In: 8th European Nitrogen Fixation Conference, 30 August - 3 September, Gent.
Terpolilli, J.J., O'Hara, G.W., Tiwari, R.P., Dilworth, M.J. and Howieson, J.G. (2008) The model legume Medicago truncatula A17 is poorly matched for N2fixation with the sequenced microsymbiont Sinorhizobium meliloti 1021. New Phytologist, 179 (1). pp. 62-66.
Ardley, J.K., Yates, R.J., Nandasena, K.G., Reeve, W.G., Law, I.J., Bräu, L., O'Hara, G.W. and Howieson, J.G. (2008) A new look at old root-nodule bacteria – molecular techniques uncover novel isolates. In: 15th International Nitrogen Fixation Congress and the 12th International Conference of the African Association for Biological Nitrogen Fixation, 21 - 26 January 2007, Cape Town, South Africa.
2007
Hawkes, R., O'Hara, G., Franzmann, P.D. and Plumb, J.J. (2007) Geographical distribution and diversity of moderately thermophilic members of the thermoplasmatales. In: 17th International Biohydrometallurgy Symposium, IBS 2007, 2-5 September 2007, Frankfurt.
Nandasena, K.G., O'Hara, G.W., Tiwari, R.P., Sezmiş, E. and Howieson, J.G. (2007) In situ lateral transfer of symbiosis islands results in rapid evolution of diverse competitive strains of mesorhizobia suboptimal in symbiotic nitrogen fixation on the pasture legume Biserrula pelecinus L. Environmental Microbiology, 9 (10). p. 2496.
Yates, R.J., Howieson, J.G., Reeve, W.G., Nandasena, K.G., Law, I., Bräu, L., Ardley, J.K., Nistelberger, H.M., Real, D. and O'Hara, G.W. (2007) Lotononis angolensis forms nitrogen fixing, lupinoid nodules with phylogenetically unique, fast-growing, pink-pigmented bacteria, which do not nodulate L. bainesii or L. listii. Soil Biology and Biochemistry, 39 (7). pp. 1680-1688.
Nandasena, K.G., O'Hara, G.W., Tiwari, R.P., Willlems, A. and Howieson, J.G. (2007) Mesorhizobium ciceri biovar biserrulae, a novel biovar nodulating the pasture legume Biserrula pelecinus L. International Journal of Systematic and Evolutionary Microbiology, 57 (5). pp. 1041-1045.
Tiwari, R.P., Nandasena, K.G., Dilworth, M.J., Law, I.J., Howieson, J.G., O'Hara, G.W., Ardley, J.K. and Yates, R.J. (2007) Unique root-nodule bacteria isolated from Southern African legumes. In: 15th International Nitrogen Fixation Congress and the 12th International Conference of the African Association for Biological Nitrogen Fixation, 21 - 26 January 2007, Cape Town, South Africa.
2006
Flores-Vargas, R.D. and O'Hara, G.W. (2006) Isolation and characterization of rhizosphere bacteria with potential for biological control of weeds in vineyards. Journal of Applied Microbiology, 100 (5). pp. 946-954.
Lok, Eng Hai, O'Hara, G. and Dell, B. (2006) Nodulation of the legume Pterocarpus indicus by diverse strains of rhizobia. Journal of Tropical Forest Science, 18 (3). pp. 188-194.
Nandasena, K.G., O'Hara, G.W., Tiwari, R.P. and Howieson, J.G. (2006) Rapid in situ evolution of nodulating strains for Biserrula pelecinus L. through lateral transfer of a Symbiosis Island from the original Mesorhizobial Inoculant. Applied and Environmental Microbiology, 72 (11). pp. 7365-7367.
2005
Ardley, J.K., Yates, R.J., Howieson, J.G., Nandasena, K.G., O'Hara, G.W. and Tiwari, R.P. (2005) Characterisation of root-nodule bacteria isolated from perennial Southern African species of Lotononis. In: 14th Australian nitrogen fixation conference, 21 - 25 November, Katoomba, Australia.
Bräu, L., Swift, R., O'Hara, G., Hardy, G. and Howieson, J. (2005) Development of plant growth promoting rhizosphere organisms to enhance productivity of cereals and legumes in dry-land farming in South Australia. In: 14th Australian nitrogen fixation conference, 21 - 25 November, Katoomba, Australia.
Gunn, A., O'Hara, G.W. and Tiwari, R. (2005) Investigating quorum sensing in Sinorhizobium medicae WSM419. In: 14th Australian nitrogen fixation conference, 21 - 25 November, Katoomba, Australia.
Garau, G., Reeve, W.G., Bräu, L., Deiana, P., Yates, R.J., James, D.L., Tiwari, R., O'Hara, G.W. and Howieson, J.G. (2005) The Symbiotic Requirements of Different Medicago Spp. Suggest the Evolution of Sinorhizobium Meliloti and S. Medicae with Hosts Differentially Adapted to Soil pH. Plant and Soil, 276 (1-2). pp. 263-277.
Nandasena, K.G., Tiwari, R.P., O'Hara, G.W. and Howieson, J.G. (2005) Why is it necessary to manage the in situ development of poorly effective promiscuous rhizobia. In: 14th Australian nitrogen fixation conference, 21 - 25 November, Katoomba, Australia.
2004
Reeve, W.G., Ardley, J.K., Moreau, A.L., O'Hara, G.W., Graham, P.H., Howieson, J.G. and Tiwari, R.P. (2004) Symbiotic genes transferred from Sinorhizobium medicae enable Rhizobium tropici to nodulate Medicago sativa. In: ComBio2004 Conference, 26 - 30 September, Perth, Western Australia.
Nandasena, K.G., O'Hara, G.W., Tiwari, R.P., Yates, R.J., Kishinevsky, B.D. and Howieson, J.G. (2004) Symbiotic relationships and root nodule ultrastructure of the pasture legume Biserrula pelecinus L.- a new legume in agriculture. Soil Biology and Biochemistry, 36 (8). pp. 1309-1317.
2003
Deria, A.M., Bell, R.W. and O'Hara, G.W. (2003) Organic Wheat production and Soil Nutrient Status in a mediterranean climate zone. Journal of Sustainable Agriculture, 21 (4). pp. 21-47.
2001
Nandasena, K.G., O'Hara, G.W., Tiwari, R.P., Yates, R.J. and Howieson, J.G. (2001) Phylogenetic relationships of three bacterial strains isolated from the pasture legume Biserrula pelecinus L. International Journal of Systematic and Evolutionary Microbiology, 51 (6). pp. 1983-1986.
1997
Jongruaysup, S., Dell, B., Bell, R.W., O'Hara, G.W. and Bradley, J.S. (1997) Effect of molybdenum and inorganic nitrogen on molybdenum redistribution in black gram (Vigna mungoL. Hepper) with particular reference to seed fill. Annals of Botany, 79 (1). pp. 67-74.
1993
O'Hara, G.W., Hartzook, A., Bell, R.W. and Loneragan, J.F. (1993) Differences between Bradyrhizobium strains NC92 and TAL1000 in their nodulation and nitrogen fixation with peanut in iron deficient soil. Plant and Soil, 155-56 (1). pp. 333-336.
Jongruaysup, S., O'Hara, G.W., Dell, B. and Bell, R.W. (1993) Effects of low molybdenum seed on nodule initiation, development and N2 fixation in black gram (Vigna mungo L.). Plant and Soil, 155-56 (1). pp. 345-348.
