Defining plant resistance to Phytophthora cinnamomi : a standardized approach to assessment

Allardyce, Jane A., Rookes, James E. and Cahill, David M. 2012, Defining plant resistance to Phytophthora cinnamomi : a standardized approach to assessment, Journal of phytopathology, vol. 160, no. 6, pp. 269-276.

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Title Defining plant resistance to Phytophthora cinnamomi : a standardized approach to assessment
Formatted title Defining plant resistance to Phytophthora cinnamomi : a standardized approach to assessment
Author(s) Allardyce, Jane A.
Rookes, James E.
Cahill, David M.
Journal name Journal of phytopathology
Volume number 160
Issue number 6
Start page 269
End page 276
Total pages 8
Publisher Parey
Place of publication Berlin, Germany
Publication date 2012-06
ISSN 0931-1785
1439-0434
Keyword(s) Phytophthora cinnamomi
Resistance
Root pathogen
Zea mays
Zoospores
Summary Phytophthora cinnamomi is a soil-borne plant pathogen that causes devastating disease in agricultural and natural systems worldwide. While a small number of species survive infection by the pathogen without producing disease symptoms, the nature of resistance, especially under controlled conditions, remains poorly understood. At present, there are no standardized criteria by which resistance or susceptibility to P. cinnamomi can be assessed, and we have used five parameters consisting of plant fresh weight, root growth, lesion length, relative chlorophyll content of leaves and pathogen colonization of roots to analyse responses to the pathogen. The parameters were tested using two plant species, Zea mays and Lupinus angustifolius, through a time course study of the interactions and resistance and susceptibility defined 7days after inoculation. A scoring system was devised to enable differentiation of these responses. In the resistant interaction with Z. mays, there was no significant difference in fresh weight, root length and relative chlorophyll content in inoculated compared with control plants. Both lesion size and pathogen colonization of root tissues were limited to the site of inoculation. Following inoculation L. angustifolius showed a significant reduction in plant fresh weight and relative leaf chlorophyll content, cessation of root growth and increased lesion lengths and pathogen colonization. We propose that this technique provides a standardized method for plant-P. cinnamomi interactions that could be widely used to differentiate resistant from susceptible species.
Language eng
Field of Research 060704 Plant Pathology
060705 Plant Physiology
060702 Plant Cell and Molecular Biology
Socio Economic Objective 960414 Control of Plant Pests, Diseases and Exotic Species in Forest and Woodlands Environments
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2012, Blackwell Verlag GmbH
Persistent URL http://hdl.handle.net/10536/DRO/DU:30047093

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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