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Ecotypic variation in the response of Arabidopsis thaliana to Phytophthora cinnamomi

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Abstract

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 ecotype but the number varied considerably between ecotypes. In the more susceptible ecotypes, colonisation was characterised by rapid intercellular growth and sporulation of the pathogen from 48 h post inoculation. In less susceptible ecotypes, P. cinnamomi was limited to a defined region within tissues. In response to P. cinnamomi infection, several ecotypes expressed active defence responses in both root and leaf tissue. Callose formation was close ly associated with lesion restriction as was the production of the reactive oxygen species, hydrogen peroxide. The oxidative burst was not limited to the site of pathogen ingress but also occurred in distant, uninfected tissues. We have characterised an Arabidopsis—P. cinnamomi system that will be useful for further studies of active resistance mechanisms.

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  1. Louise H. Robinson

    Present address: Department of Plant Science, University of Adelaide, Waite Campus, 5064, Glen Osmond, SA, Australia

Authors and Affiliations

  1. School of Biological and Chemical Sciences, Deakin University, 3217, Waurn Ponds, Vic, Australia

    Louise H. Robinson & David M. Cahill

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  1. Louise H. Robinson
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  2. David M. Cahill
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Correspondence to David M. Cahill.

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Robinson, L.H., Cahill, D.M. Ecotypic variation in the response of Arabidopsis thaliana to Phytophthora cinnamomi . Australasian Plant Pathology 32, 53–64 (2003). https://doi.org/10.1071/AP02064

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  • DOI: https://doi.org/10.1071/AP02064

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