Graham O’Hara

Graham O’Hara publication distribution in Plant Science and Agronomy in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Plant Science and Agronomy in 2026. The highlighted bar marks where Graham O’Hara sits on this spectrum.

Graham O’Hara D-index placement in Plant Science and Agronomy in 2026

The chart shows the D-index (discipline H-index) distribution of Plant Science and Agronomy scientists ranked by Research.com in 2026. The highlighted bar marks where Graham O’Hara sits on this spectrum.

Best Publications

• Nutritional constraints on root nodule bacteria affecting symbiotic nitrogen fixation: a review.

  G. W. O'Hara

  289
  Citations

• Changing roles for legumes in Mediterranean agriculture: developments from an Australian perspective

  J.G. Howieson;J.G. Howieson;G.W. O’Hara;G.W. O’Hara;S.J. Carr

  281
  Citations

• Mineral constraints to nitrogen fixation

  Graham W. O'hara;Nantakorn Boonkerd;Michael J. Dilworth

  247
  Citations

• 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

  Julie K. Ardley;Matthew A. Parker;Sofie E. De Meyer;Robert D. Trengove

  239
  Citations

• Maintenance of Intracellular pH and Acid Tolerance in Rhizobium meliloti.

  Graham W. O'Hara;Thomas J. Goss;Michael J. Dilworth;Andrew R. Glenn

  215
  Citations

• 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.

  Kemanthi G. Nandasena;Graham W. O'Hara;Ravi P. Tiwari;Ertuğ Sezmiş

  175
  Citations

• The model legume Medicago truncatula A17 is poorly matched for N2 fixation with the sequenced microsymbiont Sinorhizobium meliloti 1021.

  Jason J. Terpolilli;Graham W. O’Hara;Ravi P. Tiwari;Michael J. Dilworth

  170
  Citations

• Iron-deficiency specifically limits nodule development in peanut inoculated with Bradyrhizobium sp

  G. W. O'hara;M. J. Dilworth;N. Boonkerd;P. Parkpian

  168
  Citations

• Complete genome sequence of the Medicago microsymbiont Ensifer ( Sinorhizobium ) medicae strain WSM419

  Wayne Reeve;Patrick S. G. Chain;Patrick S. G. Chain;Graham O'Hara;Julie Ardley

  143
  Citations

• Rapid In Situ Evolution of Nodulating Strains for Biserrula pelecinus L. through Lateral Transfer of a Symbiosis Island from the Original Mesorhizobial Inoculant

  Kemanthi G. Nandasena;Graham W. O'Hara;Ravi P. Tiwari;John G. Howieson

  125
  Citations

• Isolation and characterization of rhizosphere bacteria with potential for biological control of weeds in vineyards

  R.D. Flores-Vargas;G.W. O'Hara

  117
  Citations

• The adaptive acid tolerance response in root nodule bacteria and Escherichia coli

  Graham W. O'Hara;Andrew R. Glenn

  96
  Citations

• Assembly and transfer of tripartite integrative and conjugative genetic elements.

  Timothy L. Haskett;Jason J. Terpolilli;Amanuel Bekuma;Graham W. O’Hara

  96
  Citations

• The Symbiotic Requirements of Different Medicago Spp. Suggest the Evolution of Sinorhizobium Meliloti and S. Medicae with Hosts Differentially Adapted to Soil pH

  Giovanni Garau;Wayne G. Reeve;Lambert Brau;Pietrino Deiana

  92
  Citations

• Root-nodule bacteria from indigenous legumes in the north-west of Western Australia and their interaction with exotic legumes

  Ron J. Yates;John G. Howieson;Kemanthi G. Nandasena;Graham W. O'Hara

  86
  Citations

• Mesorhizobium australicum sp. nov. and Mesorhizobium opportunistum sp. nov., isolated from Biserrula pelecinus L. in Australia

  Kemanthi G. Nandasena;Graham W. O'Hara;Ravi P. Tiwari;Anne Willems

  86
  Citations

• Complete genome sequence of Rhizobium leguminosarum bv. trifolii strain WSM1325, an effective microsymbiont of annual Mediterranean clovers

  Wayne Reeve;Graham O’Hara;Patrick Chain;Patrick Chain;Julie Ardley

  78
  Citations

• Enhanced nodulation and symbiotic effectiveness of Medicago truncatula when co-inoculated with Pseudomonas fluorescens WSM3457 and Ensifer ( Sinorhizobium ) medicae WSM419

  Sharon Lee Fox;Graham William O’Hara;Lambert Bräu

  73
  Citations

• Nodule morphology, symbiotic specificity and association with unusual rhizobia are distinguishing features of the genus Listia within the southern African crotalarioid clade Lotononis s.l.

  Julie K. Ardley;Wayne G. Reeve;Graham W. O'Hara;Ron J. Yates;Ron J. Yates

  73
  Citations

• Techniques for the selection and development of elite inoculant strains of Rhizobium leguminosarum in southern Australia

  J.G. Howieson;J. Malden;R.J. Yates;G.W. O'Hara

  73
  Citations

• Developing Wheat for Improved Yield and Adaptation Under a Changing Climate: Optimization of a Few Key Genes

  M.A.N. Nazim Ud Dowla;Ian Edwards;Graham O'Hara;Shahidul Islam

  66
  Citations

• Inoculating legumes: a practical guide

  E. Drew;D. Herridge;R. Ballard;G. O'Hara

  65
  Citations

• Complete genome sequence of Rhizobium leguminosarum bv trifolii strain WSM2304, an effective microsymbiont of the South American clover Trifolium polymorphum.

  Wayne Gerald Reeve;Graham O'Hara;Patrick Chain;Patrick Chain;Julie Ardley

  65
  Citations

• The interactions of Rhizobium leguminosarum biovar trifolii in nodulation of annual and perennial Trifolium spp. from diverse centres of origin

  J. G. Howieson;R. J. Yates;G. W. O'Hara;M. Ryder

  64
  Citations

• Mesorhizobium ciceri biovar biserrulae, a novel biovar nodulating the pasture legume Biserrula pelecinus L.

  Kemanthi G. Nandasena;Graham W. O'Hara;Ravi P. Tiwari;Anne Willlems

  64
  Citations

• The model legume Medicago truncatula A17 is poorly matched for N2fixation with the sequenced microsymbiont Sinorhizobium meliloti 1021

  J.J. Terpolilli;G.W. O'Hara;R.P. Tiwari;M.J. Dilworth

  7
  Citations