Phytophthora captiosa sp. nov. and P. fallax sp. nov. causing crown dieback of Eucalyptus in New Zealand

Dick, M. A.; Dobbie, K.; Cooke, D. E. L.; Brasier, C. M.

doi:10.1016/j.mycres.2006.01.008

Cited by 44 publications

(42 citation statements)

References 9 publications

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“…Nodes of support values are shown above and below. Node support given for >0.80 Bayesian posterior probabilities, >70 maximum-parsimony bootstrap values and maximum livelihood bootstrap values, and >2 decay index unresolved, basal clades that appear to be outside the main radiation of the genus (Belbahri et al 2006;Brasier et al 2005;Dick et al 2006). Cooke et al (2000) reported only three species in clade 9 and 10 (P. macrochlamydospora, P. richardiae and P. insolita); since then, 10 new Phytophthora species have been added to these clades (Blair et al 2008).…”

Section: Discussionmentioning

confidence: 99%

Phytophthora chrysanthemi sp. nov., a new species causing root rot of chrysanthemum in Japan

et al. 2010

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A new species of Phytophthora was isolated from stem and root rot of chrysanthemum in the Gifu and Toyama prefectures of Japan. The species differs from other Phytophthora species morphologically, and is characterized by nonpapillate, noncaducous sporangia with internal proliferation, formation of both hyphal swellings and chlamydospores, homothallic nature, distinctive intercalary antheridia, and funnel-shaped oogonia. The new species can grow even at 35°C, with an optimum growth temperature of 30°C in V8 juice agar medium. In phylogenetic analyses based on five nuclear regions (LSU rDNA; genes for translation elongation factor 1α, β-tubulin, 60 S ribosomal protein L10, and heat shock protein 90), the isolates formed a monophyletic clade. Although the rDNA ITS region shows a high resolution and has proven particularly useful for the separation of Phytophthora species, it was difficult to align the sequences for phylogenetic analysis. Therefore, ITS region analysis using related species as defined by the multigene phylogeny was performed, and the topology of the resulting tree also revealed a monophyletic clade formed by the isolates of the species. The morphological characteristics and phylogenetic relationships indicate that the isolates represent a new species, Phytophthora chrysanthemi sp. nov. In pathogenicity tests, chrysanthemum plants inoculated with the isolates developed lesions on stems and roots within 3 days, and the symptoms resembled the ones originally observed. Finally, the pathogen's identity was confirmed by reisolation from lesions of infected plants.

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Section: Discussionmentioning

confidence: 99%

Phytophthora chrysanthemi sp. nov., a new species causing root rot of chrysanthemum in Japan

et al. 2010

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“…in this study provides a strong indication that other new species of Phytophthora await discovery in South Africa. Examples include the recently discovered, P. captiosa and P. fallax (Dick et al 2006) from exotic Eucalyptus species in New…”

Section: Discussionmentioning

confidence: 99%

Two new Phytophthora species from South African Eucalyptus plantations

Maseko

Burgess

Coutinho

et al. 2007

Mycological Research

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A recent study to determine the cause of collar and root rot disease outbreaks of cold tolerant Eucalyptus species in South Africa resulted in the isolation of two putative new Phytophthora species. Based on phylogenetic comparisons using the ITS and β-tubulin gene regions, these species were shown to be distinct from known species. These differences were also supported by robust morphological characteristics. The names, Phytophthora frigida sp. nov. and Phytophthora alticola sp. nov. are thus provided for these taxa, which are phylogenetically closely related to species within the ITS clade 2 (P. citricola, P. tropicali and P.multivesiculata) and 4 (P. arecae and P. megakarya), respectively. Phytophthora frigida is heterothallic, and produces stellate to rosaceous growth patterns on growth medium, corraloid hyphae, sporangia with a variety of distorted shapes and has the ability to grow at low temperatures. Phytophthora alticola is homothallic and has a slower growth rate in culture. Both P. frigida and P. alticola are pathogenic to Eucalyptus dunnii. In pathogenicity tests, they were, however, less pathogenic than P. cinnamomi, which is a well-known pathogen of Eucalyptus in South Africa.

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“…Using current distribution and historical records of occurrence, we designated each species detected in this study as either introduced, if they are known globally (from agriculture and horticulture), or native, if they are currently known only from Australia (Table 1). In addition, Phytophthora fallax and Phytophthora captiosa, two species first described from Eucalyptus leaves in New Zealand (Dick et al 2006), were classified as native to Australia.…”

Section: Historical Phytophthora Records and Their Classificationmentioning

confidence: 99%

Distribution and diversity of Phytophthora across Australia

Burgess

White

McDougall

et al. 2017

Pac. Conserv. Biol.

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The introduction and subsequent impact of Phytophthora cinnamomi within native vegetation is one of the major conservation issues for biodiversity in Australia. Recently, many new Phytophthora species have been described from Australia's native ecosystems; however, their distribution, origin, and potential impact remain unknown. Historical bias in Phytophthora detection has been towards sites showing symptoms of disease, and traditional isolation methods show variable effectiveness of detecting different Phytophthora species. However, we now have at our disposal new techniques based on the sampling of environmental DNA and metabarcoding through the use of highthroughput sequencing. Here, we report on the diversity and distribution of Phytophthora in Australia using metabarcoding of 640 soil samples and we compare the diversity detected using this technique with that available in curated databases. Phytophthora was detected in 65% of sites, and phylogenetic analysis revealed 68 distinct Phytophthora phylotypes. Of these, 21 were identified as potentially unique taxa and 25 were new detections in natural areas and/or new introductions to Australia. There are 66 Phytophthora taxa listed in Australian databases, 43 of which were also detected in this metabarcoding study. This study revealed high Phytophthora richness within native vegetation and the additional records provide a valuable baseline resource for future studies. Many of the Phytophthora species now uncovered in Australia's native ecosystems are newly described and until more is known we need to be cautious with regard to the spread and conservation management of these new species in Australia's unique ecosystems.

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Phytophthora captiosa sp. nov. and P. fallax sp. nov. causing crown dieback of Eucalyptus in New Zealand

Cited by 44 publications

References 9 publications

Phytophthora chrysanthemi sp. nov., a new species causing root rot of chrysanthemum in Japan

Phytophthora chrysanthemi sp. nov., a new species causing root rot of chrysanthemum in Japan

Two new Phytophthora species from South African Eucalyptus plantations

Distribution and diversity of Phytophthora across Australia

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