Potassium phosphonate alters the defence response of Xanthorrhoea australis following infection by Phytophthora cinnamomi

Daniel, R., Wilson, Barbara and Cahill, David 2005, Potassium phosphonate alters the defence response of Xanthorrhoea australis following infection by Phytophthora cinnamomi, Australasian plant pathology, vol. 34, no. 4, pp. 541-548.

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Title Potassium phosphonate alters the defence response of Xanthorrhoea australis following infection by Phytophthora cinnamomi
Formatted title Potassium phosphonate alters the defence response of Xanthorrhoea australis following infection by Phytophthora cinnamomi
Author(s) Daniel, R.
Wilson, Barbara
Cahill, David
Journal name Australasian plant pathology
Volume number 34
Issue number 4
Start page 541
End page 548
Publisher CSIRO Publishing
Place of publication Collingwood, Vic.
Publication date 2005
ISSN 0815-3191
1448-6032
Keyword(s) dieback
induced resistance
phosphite
Summary Potassium phosphonate (phosphite) is widely used in the management of Phytophthora diseases in agriculture, horticulture and natural environments. The Austral grass tree, Xanthorrhoea australis, a keystone species in the dry sclerophyll forests of southern Australia, is susceptible to Phytophthora cinnamomi, but is protected by applications of phosphite. We examined the effect of phosphite application on the infection of X. australis seedlings and cell suspension cultures by zoospores of P. cinnamomi. Phosphite induced more intense cellular responses to pathogen challenge and suppressed pathogen ingress in both seedlings and cell cultures. In untreated X. australis seedlings, hyphal growth was initially intercellular, became intracellular 24 h after inoculation, and by 48 h had progressed into the vascular tissue. In phosphite-treated seedlings, growth of P. cinnamomi remained intercellular and was limited to the cortex, even at 72 h after inoculation. The cell membrane retracted from the cell wall and phenolic compounds and electron dense substances were deposited around the wall of infected and neighbouring cells. Suspension cells were infected within 6 h of inoculation. Within 24 h of inoculation, untreated cells were fully colonised, had collapsed cytoplasm and died. The protoplast of phosphite-treated suspension cells collapsed within 12 h of inoculation, and phenolic material accumulated in adjacent, uninfected cells. No anatomical response to phosphite treatment was observed before infection of plant tissues, suggesting that the phosphite-associated host defence response is induced following pathogen challenge. Anatomical changes provide evidence that phosphite stimulates the host defence system to respond more effectively to pathogen invasion.
Language eng
Field of Research 060704 Plant Pathology
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2005, CSIRO
Persistent URL http://hdl.handle.net/10536/DRO/DU:30008865

Document type: Journal Article
Collection: School of Biological and Chemical Sciences
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