David Miles Cahill

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Field and laboratory experiments were used to determine the effectiveness of potassium phosphonate for control of Phytophthora cinnamomi in native plants. Potassium phosphonate (from phosphonic acid neutralised with potassium hydroxide) was hand-sprayed on native vegetation in field sites at Anglesea, Victoria. Potassium phosphonate concentrations of 6 g(More)
Abscisic acid (ABA) has been implicated in determining the outcome of interactions between many plants and their pathogens. We had previously shown that increased concentrations of ABA within leaves of Arabidopsis induced susceptibility towards an avirulent strain of Pseudomonas syringae pathovar (pv.) tomato. We now show that ABA induces susceptibility via(More)
The PHYTOCHROME AND FLOWERING TIME1 gene encoding the MEDIATOR25 (MED25) subunit of the eukaryotic Mediator complex is a positive regulator of jasmonate (JA)-responsive gene expression in Arabidopsis (Arabidopsis thaliana). Based on the function of the Mediator complex as a bridge between DNA-bound transcriptional activators and the RNA polymerase II(More)
Etiolated hypocotyls of the resistant soybean (Glycine max [L.] Merr.) cultivar Harosoy 63 became susceptible to Phytophthora megasperma (Drechs.) f.sp. glycinea (Hildeb.) Kuan and Erwin race 1 after treatment with abscisic acid. Susceptibility was expressed by increases in lesion size and a major decrease in accumulation of the isoflavonoid phytoalexin,(More)
Rubber tree (Hevea brasiliensis) latex, the source of natural rubber, is synthesised in the cytoplasm of laticifers. Efficient water inflow into laticifers is crucial for latex flow and production since it is the determinant of the total solid content of latex and its fluidity after tapping. As the mature laticifer vessel rings are devoid of plasmodesmata,(More)
The concentrations of zeatin-type and isopentenyladenine-type cytokinins were reduced in the xylem extrudate collected from seedlings of Eucalyptus species following infection by Phytophthora cinnamomi Rands. The use of an enzyme-linked immunosorbent assay (ELISA) allowed the detection of these cytokinins over the range of 0.3 to 7 picomoles for the(More)
Phytophthora cinnamomi is a soil-borne plant pathogen that has caused widespread damage to vulnerable native ecosystems and agriculture systems across the world and shows no sign of abating. Management of the pathogen in the natural environment is difficult and the options are limited. In order to discover more about how resistant plants are able to defend(More)
The oomycetes are a class of protists that produce biflagellate asexual zoospores. Members of the oomycetes have close phylogenetic affinities with the chromophyte algae and are widely divergent from the higher fungi. This review focuses on two genera,Phytophthora andPythium, which belong to the family Pythiaceae, and the order Peronosporales. These two(More)
A variety of reactions to inoculation with Phytophthora cinnamomi ranging from high susceptibility to moderate resistance were found in 20 ecotypes of Arabidopsis thaliana. P. cinnamomi zoospores successfully colonised both root and leaf tissue of Arabidopsis and sporulation in the form of chlamydospores and sporangia occurred in leaves and roots of each(More)
Invasive phytoplasmas wreak havoc on coconut palms worldwide, leading to high loss of income, food insecurity and extreme poverty of farmers in producing countries. Phytoplasmas as strictly biotrophic insect-transmitted bacterial pathogens instigate distinct changes in developmental processes and defence responses of the infected plants and manipulate(More)