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Acute Pharyngitis01:30

Acute Pharyngitis

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Acute pharyngitis is the inflammation of the back of the throat (pharynx), commonly resulting in a sore throat. It is a frequently encountered condition that prompts individuals to seek medical advice.
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Acute pharyngitis can be categorized based on its underlying cause:
Chronic Pharyngitis01:23

Chronic Pharyngitis

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Prokaryotes can control gene expression through operons—DNA sequences consisting of regulatory elements and clustered, functionally related protein-coding genes. Operons use a single promoter sequence to initiate transcription of a gene cluster (i.e., a group of structural genes) into a single mRNA molecule. The terminator sequence ends transcription. An operator sequence, located between the promoter and structural genes, prohibits the operon’s transcriptional activity if bound by a repressor...
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Antibiotic Selection00:57

Antibiotic Selection

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What is Johansonia?

Pedro W Crous1, Robert W Barreto, Acelino C Alfenas

  • 1CBS-KNAW Fungal Biodiversity Centre, Uppsalalaan 8, 3584 CT Utrecht, The Netherlands;

IMA Fungus
|June 9, 2012
PubMed
Summary

A new species, Johansonia chapadiensis, was discovered on a leguminous host in Brazil. DNA sequencing places the genus Johansonia within Dothideomycetes, Capnodiales, a significant advancement for fungal classification.

Keywords:
DothideomycetesITSJohansoniellaLSUsystematics

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Area of Science:

  • Mycology
  • Fungal Taxonomy
  • Molecular Phylogenetics

Background:

  • The bitunicate ascomycete genus Johansonia is currently classified under Saccardiaceae, a family of uncertain placement within Ascomycota.
  • Accurate classification of fungal genera is crucial for understanding fungal diversity and ecological roles.

Purpose of the Study:

  • To describe a new species of Johansonia discovered in Brazil.
  • To determine the phylogenetic position of the genus Johansonia within the Ascomycota using molecular data.

Main Methods:

  • Morphological characterization of the newly discovered fungal species.
  • DNA sequencing of the nuclear ribosomal DNA (LSU) for phylogenetic analysis.

Main Results:

  • A new species, Johansonia chapadiensis, was identified and described from Mato Grosso, Brazil, found on Dimorphandra mollis.
  • Phylogenetic analysis based on LSU sequence data revealed that Johansonia belongs to the Dothideomycetes, order Capnodiales.
  • The genus Johansonia clustered basal to Schizothyriaceae and Mycosphaerellaceae, suggesting a potential placement within Saccardiaceae, though further data is needed.

Conclusions:

  • The study reclassifies the genus Johansonia within the Dothideomycetes, Capnodiales, resolving its uncertain taxonomic position.
  • The discovery of J. chapadiensis expands the known diversity of the genus Johansonia.
  • Further molecular data from other Saccardiaceae members are necessary to definitively confirm the family placement of Johansonia.