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Phytophthora bilorbang sp. nov., a new species associated with the decline of Rubus anglocandicans (European blackberry) in Western Australia

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Abstract

A new homothallic Phytophthora species, isolated from rhizosphere soil and roots of declining or dead Rubus anglocandicans (European blackberry) in south-west Western Australia, is described as Phytophthora bilorbang sp. nov. It produces non-papillate sporangia, smooth-walled oogonia containing thick-walled oospores, and paragynous antheridia. Although morphologically similar to several species within ITS Clade 6 and sub-clade II, namely P. gibbosa, P. gregata and P. megasperma, phylogenetic analyses of the ITS, cox1, HSP90, BT and NADH gene regions demonstrate that P. bilorbang sp. nov. is a distinct species. Additionally, P. bilorbang differs from these species in its growth and colony morphology on several media. Pathogenicity tests indicate that P. bilorbang could be responsible for the decline syndrome of blackberry within the Warren and Donnelly River catchments in the south-west of Western Australia.

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Acknowledgements

The authors are grateful to the Western Australian Department of Environment and Conservation for funding, the Ministry of Science, Research and Technology of Iran for financially supporting the senior author, Paul Yeoh (CSIRO Ecosystem Science, WA) and Lee Fontanini (Warren Catchments Council, Manjimup, WA) for field help, Diane White (CPSM, Murdoch University, WA) for technical support, Thomas Jung (Phytophthora Research and Consultancy, Brannenburg, Germany) for assistance with morphology and József Bakonyi (Plant Protection Institute, Centre for Agricultural Research, Hungarian Academy of Sciences) for providing sequence data for several species.

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Correspondence to Treena I. Burgess.

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Table S1

Morphological characters, dimensions and temperature-growth relations of Phytophthora bilorbang, P. gibbosa, P. gregata and P. megasperma. Characters decisive for species discrimination are highlighted in bold. (DOCX 106 kb)

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Aghighi, S., Hardy, G.E.S.J., Scott, J.K. et al. Phytophthora bilorbang sp. nov., a new species associated with the decline of Rubus anglocandicans (European blackberry) in Western Australia. Eur J Plant Pathol 133, 841–855 (2012). https://doi.org/10.1007/s10658-012-0006-5

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