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Australasian Plant Pathology

, Volume 42, Issue 3, pp 351–361 | Cite as

Variation in susceptibility of Banksia (including Dryandra) to Phytophthora cinnamomi

  • B. L. Shearer
  • C. E. Crane
  • J. A. Cochrane
Article

Abstract

Variation in susceptibility of 109 Western Australian Banksia and Dryandra and 16 Eastern Australian Banksia to Phytophthora cinnamomi infection was evaluated after soil inoculation. Banksia and Dryandra were initially analysed separately and then combined due to the transfer of Dryandra to Banksia. Disease progress curves of % mortality following soil inoculation were analysed with the three logistic model parameters of upper asymptote (Kmax), lag time (t½K) and intrinsic rate of increase (r). The susceptibility continuum represented by the ordination of parameters of the logistic model for % plant mortality in two dimensions was similar for Banksia, Dryandra and combined Banksia and Dryandra. Although resistant taxa had low Kmax, the values for delay and rate varied. In comparison, susceptible taxa tended to have high Kmax short delay and fast rate. Western Australian threatened and priority Banksia were significantly more susceptible than common Banksia. Seeders were more susceptible than resprouters. There was no significant difference in Western Australian Banksia susceptibility between soil, rainfall region, bioregion and growth form. Of the Western Australian Banksia tested, 40 % were most at risk of P. cinnamomi infection because they were either threatened, priority or common though geographically restricted taxa with Kmax of mortality >50 %. Positioning Banksia taxa on the P. cinnamomi resistance-susceptibility continuum needs to be incorporated into extinction-risk methodology in order to prioritise flora for conservation actions according to hazard from the pathogen.

Keywords

Phytophthora cinnamomi Banksia Dryandra Disease progress curves Mortality Logistic model parameters Asymptote Delay Lag Rate Susceptibility continuum Botanical epidemiology Declared rare flora Intra-specific variation Resistance mechanisms Fortuitous side effect Evolution resistance 

Notes

Acknowledgments

We thank S Barrett, C Dunne, J McComb and M Shearer for checking the manuscript.

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Copyright information

© Australasian Plant Pathology Society Inc. 2012

Authors and Affiliations

  1. 1.Science Division, Department of Environment and ConservationBentley Delivery CentrePerthAustralia

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