DISEASE NOTES OR NEW RECORDS: Phytophthora boehmeriae isolated for the first time in Western Australia

D'Souza, N.K.; Webster, J. L.; Tay, F. C. S.

doi:10.1071/ap97034

Cited by 5 publications

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“…It is best known as the causal agent of brown rot of citrus and boll rot of cotton (15) and has also been implicated in gummosis of Acacia mearnsii in South Africa and Brazil (14). In WA, it was isolated from soil baits at only one site, collected beneath a dead, mature Persoonia longifolia (10). P. asparagi has just been described as a pathogen of asparagus in Michigan, USA (29).…”

Section: Discussionmentioning

confidence: 99%

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Re-evaluation of Phytophthora Species Isolated During 30 Years of Vegetation Health Surveys in Western Australia Using Molecular Techniques

Burgess

Webster²,

Ciampini³

et al. 2009

Plant Disease

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For 30 years, large-scale aerial photography has been used to map the extent of Phytophthora dieback disease in native forests in the southwest of Western Australia, with validation of the observations involving routine testing of soil and root samples for the presence of Phytophthora cinnamomi. In addition to P. cinnamomi, six morpho-species have been identified using this technique: P. citricola, P. megasperma, P. cryptogea, P. drechsleri, P. nicotianae, and P. boehmeriae. In recent years, many new Phytophthora species have been described worldwide, often with similar morphology to existing species; thus, as many of the isolates collected in Western Australia have been difficult to identify based on morphology, molecular identification of the morpho-species is required. Based on amplification of the internal transcribed spacer (ITS) region of the rDNA gene, sequence data of more than 230 isolates were compared with those of existing species and undescribed taxa. P. inundata, P. asparagi, P. taxon PgChlamydo, P. taxon personii, and P. taxon niederhauserii were identified based on sequence data. Phylogenetic analysis revealed that nine potentially new and undescribed taxa can be distinguished. Several of the new taxa are morphologically indistinguishable from species such as P. citricola, P. drechsleri, and P. megasperma. In some cases, the new taxa are closely related to species with similar morphology (e.g., P.sp.4 and P. citricola). However, the DNA sequences of other new taxa such as P.sp.3 and P.sp.9 show that they are not closely related to morphologically similar species P. drechsleri and P. megasperma, respectively. Most of the new taxa have been associated with dying Banksia spp., while P.sp.2 and P.sp.4 have also been isolated from dying Eucalyptus marginata (jarrah). Some taxa (P.sp.3, 6, and 7) appear to have limited distribution, while others like P.sp.4 are widespread.

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Section: Discussionmentioning

confidence: 99%

“…However, about 10 to 15% of baited samples return a positive result for Phytophthora species other than P. cinnamomi. Six other Phytophthora spp., P. citricola, P. megasperma, P. cryptogea, P. drechsleri, P. nicotianae, and P. boehmeriae, have been isolated and identified using morphological characters (10,35).…”

mentioning

confidence: 99%

Re-evaluation of Phytophthora Species Isolated During 30 Years of Vegetation Health Surveys in Western Australia Using Molecular Techniques

Burgess

Webster²,

Ciampini³

et al. 2009

Plant Disease

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“…Phytophthora blight caused by Phytophthora boehmeriae Saw. is a limiting factor for the production of cotton, ramie, citrus, black wattle, chili, and several other plants (D'Souza et al 1997;Ho and Lu 1997;Elena and Paplomatas 1998;Thomidis et al 2002;Dos Santos et al 2006;Wu et al 2010;Chowdappa et al 2014;Alves et al 2019;Thorpe et al 2021). In China, P. boehmeriae is the causal organism of cotton blight and ramie blight, causing destructive disease losses frequently (Ho and Lu, 1997;Chen et al 2001;Gao 2007;Wu et al 2010;Wang et al 2020a).…”

Section: Introductionmentioning

confidence: 99%

Metalaxyl-resistant mutant strains of Phytophthora boehmeriae are as aggressive and fit as their metalaxyl-sensitive wild-type parents

Chen

Jiang

et al. 2023

Trop. plant pathol.

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Phytophthora boehmeriae Sawada is an important pathogenic oomycete, and causes Phytophthora blight of cotton and ramie, which are main limiting factors to the production of cotton and ramie in China. The aggressiveness and fitness of the metalaxyl-resistant (MR) mutants of P. boehmeriae obtained by inducing on LBA amended with sublethal dose (10 µg·mL−1) of metalaxyl were studied in this paper. The results showed that there were no significant differences between the MR mutants and their metalaxyl-sensitive (MS) wild-type parents in temperature for mycelial growth, zoosporangium production, sensitivity to malachite green, and the pathogenicity to cotton seedlings. However, the oospore productions of the mutants were much lower than those of their MS parents. The growth rates and the colony morphology of MR mutants and their MS parents all displayed obvious variation or separation, and were inherited unsteadily in their single-zoospore and single-oospore progenies. At the same time, the homothallic character of MR mutants could inherit steadily as well as that of the MS wild-type isolates did in asexual and sexual progenies. It was suggested that the MR mutants of P. boehmeriae possessed equal aggressiveness and fitness with their MS parental isolates, and would develop the MR population easily in a short time as long as the MR mutants formed. Thereby, there would be a high risk of development of metalaxyl resistance in populations of P. boehmeriae in the field, when metalaxyl was long and continuously applied for the control of the diseases caused by P. boehmeriae.

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“…Other Phytophthora species including P. citricola, P. megasperma, P. cryptogea, P. drechsleri and P. nicotianae (Stukely et al 1997), and at one location P. boehmeriae (D'Souza et al 1997), have also been recovered, either alone or in the same samples as P. cinnamomi. Phytophthora inundata has recently been identified by DNA sequencing in samples collected from the Southern Jarrah Forest in 2005 and from Banksia heathlands on the South Coast in 1986 (Stukely et al 2007).…”

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confidence: 99%

A new homothallicPhytophthorafrom the jarrah forest in Western Australia

Stukely¹,

Webster²,

Ciampini³

et al. 2007

Austral. Plant Disease Notes

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A homothallic Phytophthora, isolated at irregular intervals since the 1980s from Western Australian jarrah (Eucalyptus marginata) forest sites, has been previously misidentified as P. citricola based on morphological characters. Based on rDNA sequencing, it has been shown to be an undescribed species that is provisionally designated 'Phytophthora sp. WA2' pending a full description. It has been associated with lower stem lesions and root necrosis on dying 1-to 2-year-old jarrah seedlings growing in rehabilitated open-cut bauxite mine pits.

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DISEASE NOTES OR NEW RECORDS: Phytophthora boehmeriae isolated for the first time in Western Australia

Cited by 5 publications

References 0 publications

Re-evaluation of Phytophthora Species Isolated During 30 Years of Vegetation Health Surveys in Western Australia Using Molecular Techniques

Re-evaluation of Phytophthora Species Isolated During 30 Years of Vegetation Health Surveys in Western Australia Using Molecular Techniques

Metalaxyl-resistant mutant strains of Phytophthora boehmeriae are as aggressive and fit as their metalaxyl-sensitive wild-type parents

A new homothallicPhytophthorafrom the jarrah forest in Western Australia

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