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The phylum Tenericutes, which includes the single class Mollicutes, comprises bacteria that lack cell walls. The term "Mollicutes" derives from the Latin word mollis, meaning "soft." These organisms are among the smallest known and are commonly referred to as mycoplasmas due to the prominence of the genus Mycoplasma, which includes well-known human pathogens. Despite their inability to stain gram-positively (a result of their lack of cell walls), mycoplasmas are phylogenetically related to the...
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Polyphasic characterisation of three new Phyllosticta spp.

Y Y Su1, L Cai

  • 1State Key Laboratory of Mycology, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, P.R. China;

Persoonia
|October 30, 2012
PubMed
Summary

This study describes three new Phyllosticta fungal species discovered on Hosta, Schima, and Ilex plants in China and the UK. DNA analyses and morphological characteristics confirm these new taxa, expanding our understanding of Phyllosticta diversity.

Keywords:
molecularmorphologyphylogenysystematicstaxonomy

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Area of Science:

  • Mycology
  • Plant Pathology
  • Molecular Systematics

Background:

  • Phyllosticta species are significant plant pathogens.
  • Accurate identification and classification of fungal species are crucial for disease management and understanding biodiversity.
  • Previous research has not fully characterized certain Phyllosticta populations associated with specific hosts.

Purpose of the Study:

  • To describe and formally introduce three new species of Phyllosticta.
  • To differentiate these new species from morphologically similar and phylogenetically related taxa.
  • To establish the phylogenetic placement of the new species within the Phyllosticta genus.

Main Methods:

  • A polyphasic approach integrating morphological characterization, host association, and disease symptomology.
  • DNA sequence analyses of the nrDNA-internal transcribed spacer (ITS) regions.
  • Multilocus phylogenetic analyses using ITS, TEF1, ACT, and GPDH gene regions.

Main Results:

  • Three new Phyllosticta species are described: P. hostae (on Hosta plantaginea, China), P. schimae (on Schima superba, China), and P. ilicis-aquifolii (on Ilex aquifolium, UK).
  • Morphological, ecological, and molecular data support the distinctiveness of these new taxa.
  • Phylogenetic analyses reveal the evolutionary relationships of the new species within the Phyllosticta genus.

Conclusions:

  • The introduction of P. hostae, P. schimae, and P. ilicis-aquifolii is justified based on comprehensive data.
  • This study contributes to the taxonomic knowledge of the genus Phyllosticta.
  • The findings enhance our ability to identify and manage diseases caused by these fungi.