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Resolving the Melampsora epitea complex.

Peng Zhao1, Makoto Kakishima2,3, Qi Wang2

  • 1a State Key Laboratory of Mycology, Institute of Microbiology , Chinese Academy of Sciences , Beijing , 100101 , People's Republic of China.

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|June 23, 2017
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Summary
This summary is machine-generated.

The rust pathogen Melampsora epitea on willows is a complex of species, not just one. This study identifies 12 distinct species, including two new ones, from East Asia using DNA and morphology.

Keywords:
MelampsoraceaeSalixmolecular phylogenymorphologyspecies boundary

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Area of Science:

  • Mycology
  • Plant Pathology
  • Evolutionary Biology

Background:

  • Melampsora epitea is a significant rust pathogen affecting willows.
  • Its species boundaries are unclear, often confused with similar species like M. arctica.
  • Previous DNA studies suggested M. epitea represents a species complex.

Purpose of the Study:

  • To clarify the species boundary of Melampsora epitea using phylogenetic analysis.
  • To identify and describe new species within the M. epitea complex in East Asia.
  • To correlate morphological traits with genetic divergence and host specificity.

Main Methods:

  • Phylogenetic analysis of ribosomal DNA (rDNA) from 534 specimens.
  • Application of the general mixed Yule coalescent (GMYC) model for species delimitation.
  • Evaluation of morphological characters in uredinial and telial stages.
  • Designation of type specimens for taxonomic stability.

Main Results:

  • Twelve distinct species were identified, including 10 known and 2 newly described species.
  • Phylogenetic analysis revealed significant genetic divergence within the M. epitea complex.
  • Specific morphological characters were found to be key in distinguishing between allied species.
  • Two new species, Melampsora salicis-futurae and M. salicis-triandrae, were described.

Conclusions:

  • Melampsora epitea is a species complex, requiring re-evaluation of its taxonomy.
  • Morphological and molecular data together provide robust species delimitation.
  • The study clarifies the identity of willow rust pathogens in East Asia and provides stable taxonomic references.