Systematic analysis of the falcate-spored graminicolous <i>Colletotrichum</i> and a description of six new species from warm-season grasses

Crouch, Jo Anne; Clarke, Bruce B.; White, James F.; Hillman, Bradley I.

doi:10.3852/08-230

Cited by 100 publications

(89 citation statements)

References 21 publications

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“…Concerns were expressed occasionally when using ITS sequence data alone for the identification of Colletotrichum spp (2). Crouch et al reported a high error rate (86%) for comparing ITS sequence data within the C. graminicola species complex (6). Similarly, more than 86% evolutionary divergence was noted from type species of C. gloeosporioides for the analysis of 343 ITS sequences (3).…”

Section: Discussionmentioning

confidence: 99%

“…The epitypification of this fungus is important, as the type strain might have been lost or might be in poor condition (12,29). Certain positive developments in the epitypification has helped to solve many taxonomic problems and the understanding of species, genera, families, or orders of this group of fungi (6,11,12,25,29). Presently, Colletotrichum spp.…”

Section: Discussionmentioning

confidence: 99%

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Colletotrichum truncatum: an Unusual Pathogen Causing Mycotic Keratitis and Endophthalmitis

Shivaprakash¹,

Appannanavar²,

Dhaliwal³

et al. 2011

J Clin Microbiol

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In recent years, the well-known plant pathogens of the Colletotrichum genus were increasingly reported to cause ophthalmic infections in humans. Among 66 species in the Colletotrichum genus, only a few are known to be pathogenic for humans. We report here five cases of ophthalmic infections due to Colletotrichum truncatum, a species never reported earlier to cause human infection. The isolates were identified by morphological characteristics and the sequencing of internal spacer regions of ribosomal DNA. The progress of lesions in those patients was slow compared to that of lesions caused by Aspergillus or Fusarium infections. The surgical management included total penetrating keratoplasty in patients with keratitis and pars plana vitrectomy in endophthalmitis. Two patients were treated additionally with intravitreal amphotericin B deoxycholate, one patient with oral itraconazole, and another patient with oral and topical fluconazole therapy. The present series therefore highlights the expanding spectrum of agents causing eye infections and the inclusion of C. truncatum as a human pathogen.Colletotrichum species are well-known plant pathogens in tropical and subtropical countries. The taxonomy and nomenclature of Colletotrichum species are confusing, even to scientists working in this field (11). Initially, the species were identified by the characteristic host specificity, location of isolation, and conidial morphology. Subsequently, based on morphological characteristics, host range (of plants), and phylogenetic analysis, the fungi in the genus Colletotrichum were systematically classified.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Colletotrichum truncatum: an Unusual Pathogen Causing Mycotic Keratitis and Endophthalmitis

Shivaprakash¹,

Appannanavar²,

Dhaliwal³

et al. 2011

J Clin Microbiol

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“…The ascomycete genus Colletotrichum (Glomerellaceae, Sordariomycetes) contains many well-known plant pathogens that cause anthracnose and a range of diseases worldwide on economic crops and ornamental plants (Crouch & Beirn 2009, Crouch et al 2009, Damm et al 2009, Hyde et al 2009a. They are amongst the most important plant pathogens as they cause latent or quiescent infections at the pre-harvest and post-harvest stages (Sutton 1992).…”

Section: Evolution Of Species Criteria In Colletotrichummentioning

confidence: 98%

The evolution of species concepts and species recognition criteria in plant pathogenic fungi

et al. 2011

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In this paper, we review historical and contemporary species concepts and species recognition criteria for plant pathogenic fungi. Previous incongruent and unstable classification based on subjective and changing criteria have led to some confusion, especially amongst plant pathologists. The goal of systematics is to provide an informative and robust framework that stands the test of time. The taxonomic histories of Cercospora, Colletotrichum, Fusarium, as well as the rust and smut fungi, are used as examples, to show how concepts and criteria used to delimit and recognize species have changed. Through these examples we compare the Genealogical Concordance Phylogenetic Species Recognition, an extension of the Phylogenetic Species Criterion, with other species recognition criteria and show that it provides a better discrimination for delimiting species. A rapidly increasing number of cryptic species are being discovered amongst plant pathogenic fungi using the Genealogical Concordance Phylogenetic Species Recognition, and it is important to determine their host range, the severity of diseases they cause and their biosecurity significance. With rapidly expanding global trade it has become imperative that we develop effective and reliable protocols to detect these previously unrecognized pathogens.

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“…On the other hand, it also has been determined that there are many sequences deposited in GenBank incorrectly named Colletotrichum species Crouch et al 2009a;Phoulivong 2011), and the question has been raised as to the use of nucleotide data in species identification. As a consequence, several researchers (Cannon et al 2008;Crouch and Beirn 2009;Crouch et al 2009b;Damm et al 2009) have made efforts directed towards the goal of revising the genus with the use of epitypification. Cai et al (2009) introduced a polyphasic approach to deal with species concepts in the genus, and this hypothesis was also suggested as appropriate for the plant pathogenetic Colletotrichum .…”

Section: Problems Of Identification Of Colletotrichum Endophytes Usinmentioning

confidence: 98%

From morphology to molecular biology: can we use sequence data to identify fungal endophytes?

et al. 2011

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Isolation followed by morphological identification was the traditional basis of all earlier endophyte studies. However, the use of molecular phylogenetics has become increasingly common in the identification of fungal endophytes, and during the period of 2007-2010 there were approximately 200 publications that reported data obtained using this approach. This new methodology involves using sequence data from isolates or whole DNA from plant substrates, which are amplified using fungus-specific primers. The data obtained are compared with sequences downloaded from public databases such as GenBank and then used to construct phylogenetic trees. The major problem with this approach is that much of the sequence data in these databases has been shown to be from isolates that were incorrectly named. In some species, as much as 86% of the sequences available are not from the organism whose name has been applied to the sequence in question. The use of these GenBank sequences to identify endophytic isolates by sequence similarity simply perpetuates the problem of wrong species identification, and any lists of endophytes established by such methods are likely to be highly erroneous. It is recommended that comparisons of sequence data be made using sequences from type species, and if such sequences are not available, then the data must be treated with caution.

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Systematic analysis of the falcate-spored graminicolous Colletotrichum and a description of six new species from warm-season grasses

Cited by 100 publications

References 21 publications

Colletotrichum truncatum: an Unusual Pathogen Causing Mycotic Keratitis and Endophthalmitis

Colletotrichum truncatum: an Unusual Pathogen Causing Mycotic Keratitis and Endophthalmitis

The evolution of species concepts and species recognition criteria in plant pathogenic fungi

From morphology to molecular biology: can we use sequence data to identify fungal endophytes?

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