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Soil type and season mediated Phytophthora cinnamomi sporangium formation and zoospore release

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Abstract

The capacity of Phytophthora cinnamomi to sporulate and release zoospores in northern jarrah forest bauxite mining soils sampled in summer, winter and spring was determined. Soil types examined were a surface jarrah forest soil, a Bassendean sand and haul road, mine floor silt and a mine bauxite soil. Dependent variables indicating the stimulatory capacity of the soils were sporangia formed/mm2 of mycelium and numbers of viable zoospores released from sporangia formed. Forest soil was more stimulatory than the Bassendean sand, which was more stimulatory than the mining soils. Mine pit floor and haul road soil was least stimulatory. The numbers of zoospores released were significantly greater in the jarrah forest soil and Bassendean Sand than the mining soils. Season influenced the soil stimulatory capacity of jarrah forest, Bassendean sand and haul road soils, with sporangia counts for winter collected soils being significantly less than for summer and spring collected soils. The numbers of zoospores released were significantly greater for soils sampled in spring than those sampled in summer and winter. With respect to hygiene considerations, P. cinnamomi in host tissue does have the capacity to reproduce at low levels, relative to the forest surface soil, by sporangial formation and zoospore release in the mine pit floor and haulage road soils.

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Acknowledgements

We thank M. Williams and K. Whitford for assistance with the statistics, J. Kinal and A. Kennett-Smith for technical advice, R. Bowles, M. Dillon, L. Vickery and J Webster for their help and Alcoa of Australia Ltd for funding.

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  1. Science Division, Department of Environment and Conservation, Locked Bag 104, Bentley Delivery Centre, Perth, WA, 6983, Australia

    B. R. Morgan & B. L. Shearer

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  1. B. R. Morgan
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  2. B. L. Shearer
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Correspondence to B. L. Shearer.

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Morgan, B.R., Shearer, B.L. Soil type and season mediated Phytophthora cinnamomi sporangium formation and zoospore release. Australasian Plant Pathol. 42, 477–483 (2013). https://doi.org/10.1007/s13313-013-0201-7

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  • DOI: https://doi.org/10.1007/s13313-013-0201-7

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