&lt;I&gt;Phoma canadensis&lt;/I&gt; Allesch.: a synonym of &lt;I&gt;Pyrenochaeta cava&lt;/I&gt;

Duarte, Lidiane Leal; Barreto, Robert W.

doi:10.5248/130.731

Cited by 3 publications

(2 citation statements)

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“…On the other hand, measurements may vary slightly between the isolates and the above may be due to multiple environmental factors that affect the development of the pathogen, as mentioned by Burton et al (1997), making a relationship with the symptoms of the disease in cantaloupe and watermelon and identifying the causal agent based on morphological structures and analysis of ITS sequences. Unllike our isolates, the pycnidia reported by Duarte and Barreto (2015) do not have the typical setae around the ostiole, indicating that this attribute is not a generic characteristic. Likewise, the characteristics shared by the fungi P. lycopersici and S. terrestris are very similar to the difference that in P. lycopersici the setae of its pycnidia are over 200 µm long, wereas S. terrestris regularly range between 50-150 µm, approximately (De Gruyter, 2010).…”

Section: Setae (µM) Pycnidium (µM) Conidia (µM) Referencementioning

confidence: 56%

“…Likewise, those sequences were also compared with those reported by De Gruyter et al (2010) and similar results were obtained. On the other hand, Duarte and Barreto (2015) used the same Bayesian inference analysis criterion, with the difference that they relied only on LSU sequences, whereas in this study, concatenated ITS and LSU sequences were used. This is of great importance, since in recent years, it has been proven and supported that these genera are very closely related and can only be distinguished through phylogenetic analysis with concatenated sequences (De Gruyter et al, 2010).…”

Section: Phylogenetic Analysismentioning

confidence: 99%

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Morphological characterization, phylogeny and pathogenesis of Setophoma terrestris causing corky and pink roots of tomato (Solanum lycopersicum) in Sinaloa, Mexico

López-López,

Tovar-Pedraza,

León-Félix

et al. 2024

RMF, MJP

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Tomato (Solanum lycopersicum) is one of Mexico’s main crops. In the years 2017 and 2018, symptoms of corky and pink roots were observed with an incidence of 10 to 20% in Culiacan, Sinaloa, Mexico. In the foliage, plants presented a generalized chlorosis, with stunted growth and senescence in the leaves. In the roots, brown and pink lesions were formed, as well as a corky texture. The objective of this study was to morphologically and molecularly characterize fungal isolates associated to corky and pink root in tomato orchards in Culiacan, Sinaloa, as well as to evaluate their pathogenicity. Monoconidial isolates were obtained and they were identified as Setophoma terrestris, based on their morphological characteristics. To confirm the identity, the area of the internal transcribed spacers (ITS) of the rDNA was amplified and sequenced, along with a fragment of the gene 28S of the rRNA (LSU). Using the sequences obtained, a phylogenetic tree was created using the Bayesian Inference and it was found that the sequences were grouped with the ex–type sequences of Setophoma terrestris. The pathogenicity of the isolates was verified by inoculating mycelial discs into the root of 10 one-month-old tomato seedlings. The roots of the seedlings inoculated with PDA discs without mycelium served as a control. Thirty days after inoculation, corky and pink root symptoms appeared, whereas the roots of control plants remained healthy. According to the morphological characterization, the molecular identification and the pathogenicity tests, Setophoma terrestris was confirmed to be the causal agent of corky and pink root in agricultural tomato orchards in Culiacan, Sinaloa.

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Section: Setae (µM) Pycnidium (µM) Conidia (µM) Referencementioning

confidence: 56%

Section: Phylogenetic Analysismentioning

confidence: 99%

Morphological characterization, phylogeny and pathogenesis of Setophoma terrestris causing corky and pink roots of tomato (Solanum lycopersicum) in Sinaloa, Mexico

López-López,

Tovar-Pedraza,

León-Félix

et al. 2024

RMF, MJP

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Mycobiota of the weed Conyza canadensis (Asteraceae) in Brazil

2016

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Conyza canadensis is a noxious and notably problematic weed in Brazil whose control is greatly challenging due to the appearance, in the last years, of herbicide resistant populations. An investigation regarding the associated pathogenic fungi of this plant was conducted in Brazil aimed at starting a biological control program to help mitigate its economic impact. Ten fungal species were yielded and described: two ascomycetes (Leptosphaerulina conyzicola sp. nov. and Wentiomyces melioloides), five hyphomycete asexual morphs (Alternaria tenuissima, Cercospora conyzicola sp. nov., Cercosporella virgaureae, and Fusarium fujikuroi), two coelomycete asexual morphs (Phoma conyzaphthora sp. nov., Septoria erigerontis), one rust fungus (Aecidium conyzicola sp. nov.), and one oomycete (Basidiophora entospora). Four among the fungi that were collected represent new taxa, and the others represented either new host-records of known fungal species or new geographic records or both, except for C. virgaureae that had already been recorded on C. canadensis in Brazil. None of the discovered species have any potential to be used as a mycoherbicide or to be introduced somewhere else, nevertheless, the knowledge about this mycobiota will help guide the selection of potential biocontrol agents to be introduced in Brazil.

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Phoma diseases: Epidemiology and control

2020

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Phoma is the most widely distributed and omnipresent genus of the order Pleosporales and the largest genus with some 3,000 taxa described so far. Of these, approximately 110 species are pathogenic and occupy varied ecological niches. The genus Phoma is polyphyletic and is not really delimited, with unclear species boundaries that make it a taxonomically controversial genus. Fungi belonging to Phoma commonly occur on crop plants that are economically important, where they cause devastating plant diseases. Pathogenic members of Phoma sensu lato species attack crop plants with symptoms ranging from leaf blight to root rot, and even wilting of the plant. In infected crop residues and field stubbles, the pathogen produces abundant pycnidia and pseudothecia that serve as the source of primary inoculum, whilst repeated crops of conidia produced inside pycnidia are the main source of secondary infection during the same growing season. After successful infection, the pathogen produces various phytotoxins that alter photosynthetic efficiency and actin cytoskeleton‐based functions, and cause electrolyte leakage from cells. Controlling the diseases caused by members of Phoma sensu lato is challenging and efforts have been made to identify resistant varieties that can be used in various plant breeding programmes. Studies have also been conducted to devise cultural and biological control measures as well as to evaluate the efficacy of fungicides against members of Phoma sensu lato. In this review we aim to discuss the disease epidemiology and control measures that can be practised to protect crops from Phoma diseases.

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<I>Phoma canadensis</I> Allesch.: a synonym of <I>Pyrenochaeta cava</I>

Cited by 3 publications

References 0 publications

Morphological characterization, phylogeny and pathogenesis of Setophoma terrestris causing corky and pink roots of tomato (Solanum lycopersicum) in Sinaloa, Mexico

Morphological characterization, phylogeny and pathogenesis of Setophoma terrestris causing corky and pink roots of tomato (Solanum lycopersicum) in Sinaloa, Mexico

Mycobiota of the weed Conyza canadensis (Asteraceae) in Brazil

Phoma diseases: Epidemiology and control

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