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

Aghighi, S.; Hardy, G.; Scott, J. K.; Burgess, Treena I.

doi:10.1007/s10658-012-0006-5

Cited by 56 publications

(47 citation statements)

References 30 publications

(35 reference statements)

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“…A subsequent molecular re-evaluation of these isolates identified numerous new Phytophthora species ). In combination with subsequent sampling of waterways within native ecosystems (Hüberli et al 2013), 27 taxa have now been identified, including seven known species, 14 species described as a result of these studies (Scott et al 2009;Rea et al 2010Rea et al , 2011Crous et al 2011Crous et al , 2012Crous et al , 2014Jung et al2011;Aghighi et al 2012;Simamora et al 2015;Safaiefarahani et al 2015) and six taxa awaiting description. Most of these newly described species were known only from WA, with only P. multivora known to have a global distribution.…”

Section: Discussionmentioning

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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Section: Discussionmentioning

confidence: 99%

Distribution and diversity of Phytophthora across Australia

Burgess

White

McDougall

et al. 2017

Pac. Conserv. Biol.

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“…For example, P. gonapodyides was isolated frequently from water in North America (Reeser et al 2011), UK (Brasier et al 2003), France (Hansen and Delatour 1999) and Argentina (Greslebin et al 2005). Likewise P. bilorbang (Phytophthora taxon OakSoil) is well known from France Delatour 1999, Brasier et al 2003), North America (Reeser et al 2011) and Australia (Aghighi et al 2012). In Australia several other species, such as P. amnicola, P. fluvialis, P. inundata and P. thermophile, were isolated frequently from water , Crous et al 2012, Hü berli et al 2013.…”

Section: Figmentioning

confidence: 99%

MultiplePhytophthoraspecies associated with a single riparian ecosystem in South Africa

Nagel¹,

Slippers²,

Wingfield

et al. 2015

Mycologia

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The diversity of Phytophthora spp. in rivers and riparian ecosystems has received considerable international attention, although little such research has been conducted in South Africa. This study determined the diversity of Phytophthora spp. within a single river in Gauteng province of South Africa. Samples were collected over 1 y including biweekly river baiting with Rhododendron indicum leaves. Phytophthora isolates were identified with phylogenetic analyses of sequences for the internal transcribed spacer (ITS) region of the ribosomal DNA and the mitochondrial cytochrome oxidase c subunit I (coxI) gene. Eight Phytophthora spp. were identified, including a new taxon, P. taxon Sisulu-river, and two hybrid species from Cooke's ITS clade 6. Of these, species from Clade 6 were the most abundant, including P. chlamydospora and P. lacustris. Species residing in Clade 2 also were encountered, including P. multivora, P. plurivora and P. citrophthora. The detection of eight species in this investigation of Phytophthora diversity in a single riparian river ecosystem in northern South Africa adds to the known diversity of this genus in South Africa and globally.

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“…Furthermore, root pathogens, like Phytophthora, need to be investigated for their association with dieback (Aghighi et al 2012), as this study focused more on quantitative evidence of the aboveground agents.…”

Section: Pathogenicity Chaptermentioning

confidence: 99%

Mimosa pigra dieback in the Northern Territory, Australia: Investigation into possible causes

Sacdalan¹

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In this study, Mimosa pigra dieback is described as plants or population of plants which appeared to suffer from ill health, death of their growing points and the emergence of green reshoots coming from the base. Dieback is an important phenomenon, not only in many crops and natural forests worldwide, but also in many invasive trees and shrubs in Australia. The dieback phenomenon is thought to be caused by complex and interacting factors and causes are often difficult to disentangle. In some cases it is a result of an interaction between both biotic and abiotic factors. Since 1988, dieback has been widely observed in Mimosa pigra L.(Fabaceae), a woody shrub that is one of the most serious exotic invaders of floodplains and riparian areas in the Top End of the Northern Territory. However, there has been no conclusive evidence of links between M. pigra dieback and specific causal factors. In addition, the dieback phenomenon has not been previously quantified.This thesis aimed to describe M. pigra dieback phenomenon at plant and population levels and its effect on plant growth, survival and demography. Specifically, the aim of this thesis was to evaluate the role of biotic factors (insect borers and fungal pathogens), and abiotic factors (soil pH and salinity), in relation to the development of M. pigra dieback. In addition, the thesis examines the pathogenicity of the fungal endophytes/pathogens associated with diebackaffected and healthy M. pigra. M. pigra has been a focus of biological control programs for more than 30 years, but it still remains a serious threat in the wetlands and conservation areas in the Top End of the Northern Territory. While extensive studies have been conducted to evaluate the impact of biological control programs, little is actually known about dieback and its causal factors.To evaluate the causal factors of M. pigra dieback, repeated ground surveys, plant health assessment and specimen collection of stems and soils, were conducted in the period 2011 to 2013 in established M. pigra sites on Melaleuca Station, Mary River, Northern Territory. Insect borers were quantified and putative fungal pathogen abundance were surveyed. A combined morphological and phylogenetic approach was used for fungal pathogens/endophyte identification. Using a subset of isolates, trials were performed to examine differences in the pathogenicity of the recovered fungal pathogens/endophytes.Results of field research showed that dieback in M. pigra is highly dynamic and fluctuates in its severity. Different sites showed increases and/or decreases in plant health over time.iii Dieback affects plants in all age classes, from seedlings, juveniles to adult plants, resulting in partial mortality of plants in all age categories over the trial period. Contrary to expectations, none of the biotic and abiotic factors examined showed a direct relationship to the changing population dynamics of M. pigra dieback over time. Nevertheless, fungal isolations demonstrated that M. pigra is a host to a diverse range of endop...

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

Cited by 56 publications

References 30 publications

Distribution and diversity of Phytophthora across Australia

Distribution and diversity of Phytophthora across Australia

MultiplePhytophthoraspecies associated with a single riparian ecosystem in South Africa

Mimosa pigra dieback in the Northern Territory, Australia: Investigation into possible causes

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