title: Green and brown bridges between weeds and crops reveal novel Diaporthe species in Australia.
abstract: Diaporthe (syn. Phomopsis) species are well-known saprobes, endophytes or pathogens on a range of plants. Several species have wide host ranges and multiple species may sometimes colonise the same host species. This study describes eight novel Diaporthe species isolated from live and/or dead tissue from the broad acre crops lupin, maize, mungbean, soybean and sunflower, and associated weed species in Queensland and New South Wales, as well as the environmental weed bitou bush (Chrysanthemoides monilifera subsp. rotundata) in eastern Australia. The new taxa are differentiated on the basis of morphology and DNA sequence analyses based on the nuclear ribosomal internal transcribed spacer region, and part of the translation elongation factor-1α and ß-tubulin genes. The possible agricultural significance of live weeds and crop residues ('green bridges') as well as dead weeds and crop residues ('brown bridges') in aiding survival of the newly described Diaporthe species is discussed.
authors.affiliation: Centre for Crop Health, University of Southern Queensland, West Street, Toowoomba. Queensland 4350 Australia;; School of Agriculture and Food Science, The University of Queensland, St Lucia, Queensland 4072, Australia.
authors.forename: S M
authors.initials: SM
authors.lastname: Thompson
authors.affiliation: Plant Pathology Herbarium, Department of Agriculture, Fisheries and Forestry, Ecosciences Precinct, Dutton Park, Queensland 4102, Australia.
authors.forename: Y P
authors.initials: YP
authors.lastname: Tan
authors.affiliation: Plant Pathology Herbarium, Department of Agriculture, Fisheries and Forestry, Ecosciences Precinct, Dutton Park, Queensland 4102, Australia.
authors.forename: R G
authors.initials: RG
authors.lastname: Shivas
authors.affiliation: Centre for Crop Health, University of Southern Queensland, West Street, Toowoomba. Queensland 4350 Australia;
authors.forename: S M
authors.initials: SM
authors.lastname: Neate
authors.affiliation: CSIRO Ecosystem Sciences and Biosecurity Flagship, G.P.O. Box 1700, Canberra, Australian Capital Territory 2601, Australia.
authors.forename: L
authors.initials: L
authors.lastname: Morin
authors.affiliation: CSIRO Plant Industry, G.P.O. Box 1600, Canberra, Australian Capital Territory 2601, Australia.
authors.forename: A
authors.initials: A
authors.lastname: Bissett
authors.affiliation: School of Agriculture and Food Science, The University of Queensland, St Lucia, Queensland 4072, Australia.
authors.forename: E A B
authors.initials: EA
authors.lastname: Aitken
keywords: Phomopsis; alternate weed hosts; multi-locus; phylogeny; taxonomy
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