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Dive into the research topics where G. Hardy is active.

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Featured researches published by G. Hardy.


BMC Plant Biology | 2014

Suppression of the auxin response pathway enhances susceptibility to Phytophthora cinnamomi while phosphite-mediated resistance stimulates the auxin signalling pathway

L. Eshraghi; Jonathan P. Anderson; Nader Aryamanesh; J.A. McComb; B.L. Shearer; G. Hardy

BackgroundPhytophthora cinnamomi is a devastating pathogen worldwide and phosphite (Phi), an analogue of phosphate (Pi) is highly effective in the control of this pathogen. Phi also interferes with Pi starvation responses (PSR), of which auxin signalling is an integral component. In the current study, the involvement of Pi and the auxin signalling pathways in host and Phi-mediated resistance to P. cinnamomi was investigated by screening the Arabidopsis thaliana ecotype Col-0 and several mutants defective in PSR and the auxin response pathway for their susceptibility to this pathogen. The response to Phi treatment was also studied by monitoring its effect on Pi- and the auxin response pathways.ResultsHere we demonstrate that phr1-1 (phosphate starvation response 1), a mutant defective in response to Pi starvation was highly susceptible to P. cinnamomi compared to the parental background Col-0. Furthermore, the analysis of the Arabidopsis tir1-1 (transport inhibitor response 1) mutant, deficient in the auxin-stimulated SCF (Skp1 − Cullin − F-Box) ubiquitination pathway was also highly susceptible to P. cinnamomi and the susceptibility of the mutants rpn10 and pbe1 further supported a role for the 26S proteasome in resistance to P. cinnamomi. The role of auxin was also supported by a significant (P < 0.001) increase in susceptibility of blue lupin (Lupinus angustifolius) to P. cinnamomi following treatment with the inhibitor of auxin transport, TIBA (2,3,5-triiodobenzoic acid). Given the apparent involvement of auxin and PSR signalling in the resistance to P. cinnamomi, the possible involvement of these pathways in Phi mediated resistance was also investigated. Phi (especially at high concentrations) attenuates the response of some Pi starvation inducible genes such as AT4, AtACP5 and AtPT2 in Pi starved plants. However, Phi enhanced the transcript levels of PHR1 and the auxin responsive genes (AUX1, AXR1and AXR2), suppressed the primary root elongation, and increased root hair formation in plants with sufficient Pi.ConclusionsThe auxin response pathway, particularly auxin sensitivity and transport, plays an important role in resistance to P. cinnamomi in Arabidopsis, and phosphite-mediated resistance may in some part be through its effect on the stimulation of the PSR and auxin response pathways.


European Journal of Forest Research | 2013

Sudden forest canopy collapse corresponding with extreme drought and heat in a mediterranean-type eucalypt forest in southwestern Australia

G. Matusick; K. Ruthrof; N.C. Brouwers; B. Dell; G. Hardy


Forest Ecology and Management | 2010

Soil bacterial functional diversity is associated with the decline of Eucalyptus gomphocephala

Y.F. Cai; P. Barber; B. Dell; Philip A. O’Brien; N. Williams; B. Bowen; G. Hardy


Open Journal of Forestry | 2012

Drought and Heat Triggers Sudden and Severe Dieback in a Dominant Mediterranean-Type Woodland Species

G. Matusick; K. Ruthrof; G. Hardy


Trees-structure and Function | 2014

Topography influences the distribution of autumn frost damage on trees in a Mediterranean-type Eucalyptus forest

G. Matusick; K. Ruthrof; N.C. Brouwers; G. Hardy


Forestry | 2015

Inferring drought and heat sensitivity across a Mediterranean forest region in southwest Western Australia: a comparison of approaches

N.C. Brouwers; R. van Dongen; G. Matusick; G. Strelein; G. Hardy


Wilkinson, C., Holmes, J., Tynan, K. <http://researchrepository.murdoch.edu.au/view/author/Tynan, Kim.html>, Dell, B. <http://researchrepository.murdoch.edu.au/view/author/Dell, Bernie.html>, McComb, J. <http://researchrepository.murdoch.edu.au/view/author/McComb, Jen.html> and Hardy, G. <http://researchrepository.murdoch.edu.au/view/author/Hardy, Giles.html> (1999) Does phosphite prevent zoospore production from Phytophthora cinnamomi-colonised plants in the field. In: 12th Biennial APPS Conference Asia-Pacific Plant Pathology for the New Millenium, 27 - 30 September, Canberra, Australia. | 1999

Does phosphite prevent zoospore production from Phytophthora cinnamomi-colonised plants in the field

C. Wilkinson; J. Holmes; K. Tynan; B. Dell; J.A. McComb; G. Hardy


Hüberli, D. <http://researchrepository.murdoch.edu.au/view/author/Hüberli, Daniel.html>, Tommerup, I.C., Colquhoun, I. <http://researchrepository.murdoch.edu.au/view/author/Colquhoun, Ian.html> and Hardy, G. <http://researchrepository.murdoch.edu.au/view/author/Hardy, Giles.html> (2003) Measuring resistance in Eucalyptus marginata to Phytophthora cinnamomi: What factors change disease expression? In: 8th International Congress of Plant Pathology: Solving problems in the real world, (ICPP 2003), 2 - 7 February, Christchurch; New Zealand. | 2003

Measuring resistance in Eucalyptus marginata to Phytophthora cinnamomi: What factors change disease expression?

D. Hüberli; I.C. Tommerup; I.J. Colquhoun; G. Hardy


Genter, S. <http://researchrepository.murdoch.edu.au/view/author/Genter, Sabrina.html>, Beckwith, J.A. <http://researchrepository.murdoch.edu.au/view/author/Beckwith, Jo-Anne.html>, Howard, K. <http://researchrepository.murdoch.edu.au/view/author/Howard, Kay.html> and Hardy, G. <http://researchrepository.murdoch.edu.au/view/author/Hardy, Giles.html> (2010) Evaluation of a Phytophthora dieback management framework. In: 5th IUFRO Phytophthora Diseases in Forests and Natural Ecosystems, 7 - 12 March, Auckland and Rotorua, New Zealand. | 2010

Evaluation of a Phytophthora dieback management framework

S. Genter; J.A. Beckwith; K. Howard; G. Hardy


Barber, P. <http://researchrepository.murdoch.edu.au/view/author/Barber, Paul.html> and Hardy, G. (Editors) <http://researchrepository.murdoch.edu.au/view/author/Hardy, Giles.html> (2006) Report - Research into the cause and management of tuart decline. Tuart Health Research Group, Murdoch University | 2006

Report - Research into the cause and management of tuart decline

P. Barber; G. Hardy

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K. Tynan

University of Adelaide

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