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All that glitters is not Ramularia.

S I R Videira1, J Z Groenewald2, U Braun3

  • 1CBS-KNAW Fungal Biodiversity Centre, Uppsalalaan 8, 3584 CT Utrecht, The Netherlands; Wageningen University and Research Centre (WUR), Laboratory of Phytopathology, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands.

Studies in Mycology
|August 30, 2016
PubMed
Summary

This study clarifies the taxonomy of Ramularia and related plant pathogenic fungi using DNA and morphology. It reclassifies several genera, introducing new ones to improve species identification and reduce crop yield losses.

Keywords:
Acrodontium fagicola Videira & CrousAcrodontium luzulae Videira & CrousAcrodontium pigmentosum Videira & CrousApseudocercosporella Videira & CrousApseudocercosporella trigonotidis Videira, H.D. Shin & CrousBarcodingCercosporella catenulata Videira & CrousCercosporella gossypii Speg.CercosporoidCrocysporium rubellum Bonord.Cylindrosporium heraclei Oudem.Epicoleosporium Videira & CrousEpicoleosporium ramularioides Videira, H.D. Shin & CrousFiliella Videira & CrousFiliella pastinacae (P. Karst.) Videira & CrousFusoidiella Videira & CrousFusoidiella depressa (Berk. & Broome) Videira & CrousFusoma inaequale PreussMultilocus phylogenyMycosphaerellaMycosphaerelloides Videira & CrousMycosphaerelloides madeirae (Crous & Denman) Videira & CrousNeopseudocercosporella Videira & CrousNeopseudocercosporella brassicae (Chevall.) Videira & CrousNeopseudocercosporella capsellae (Ellis & Everh.) Videira & CrousOvularia tovarae SawadaPlant pathogenRamularia acroptili BremerRamularia alangiicola Videira, H.D. Shin & CrousRamularia aplospora Speg.Ramularia armoraciae FuckelRamularia beticola Fautrey & LambotteRamularia cerastiicola (Crous) Videira & CrousRamularia collo-cygni B. Sutton & J.M. WallerRamularia euonymicola Videira, H.D. Shin, U. Braun & CrousRamularia gaultheriae Videira & CrousRamularia geranii FuckelRamularia geraniicola Videira & CrousRamularia kriegeriana BresRamularia lamii Fuckel var. lamiiRamularia malicola Videira & CrousRamularia neodeusta Videira & CrousRamularia osterici Videira, H.D. Shin & CrousRamularia pusilla UngerRamularia rumicicola Videira, H.D. Shin & CrousRamularia stellariicola (M.J. Park et al.) Videira, H.D. Shin & CrousRamularia trigonotidis Videira, H.D. Shin & CrousRamularia vallisumbrosae CavaraRamularia variabilis FuckelRamularia veronicicola Videira & CrousRamularia weberiana Videira & CrousRamulariopsis pseudoglycines Videira, Crous & BraunSphaerulina chaenomelis (Y. Suto) Videira, U. Braun, H.D. Shin & CrousSphaerulina koreana (Crous et al.) Videira, H.D. Shin & CrousTeratoramularia Videira, H.D. Shin & CrousTeratoramularia infinita Videira & CrousTeratoramularia kirschneriana Videira & CrousTeratoramularia persicariae Videira, H.D. Shin & CrousTeratoramularia rumicicola Videira, H.D. Shin & CrousXenoramularia Videira, H.D. Shin & CrousXenoramularia arxii Videira & CrousXenoramularia neerlandica Videira & CrousXenoramularia polygonicola Videira, H.D. Shin & Crous

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Area of Science:

  • Mycology
  • Plant Pathology
  • Fungal Taxonomy

Background:

  • Ramularia species are significant plant pathogens causing crop yield losses.
  • Confusion exists with allied genera due to simple morphology and limited DNA data.
  • Accurate delimitation of Ramularia and its relatives is crucial for plant disease management.

Purpose of the Study:

  • To improve the taxonomic delimitation of Ramularia from allied genera.
  • To refine the species circumscription within the genus Ramularia.
  • To provide a robust classification of hyphomycete plant pathogens.

Main Methods:

  • A polyphasic approach combining multilocus DNA sequencing, morphological, and cultural data.
  • Amplification and sequencing of six partial genes from 420 isolates.
  • Phylogenetic analyses to assess generic and species relationships.

Main Results:

  • Ramularia and Ramulariopsis were confirmed as monophyletic, while Cercosporella and Pseudocercosporella were polyphyletic.
  • Phacellium was synonymized under Ramularia.
  • New genera (Teratoramularia, Xenoramularia) and several other new genera were introduced to accommodate problematic taxa.
  • 24 new species and 9 new combinations were described.

Conclusions:

  • The study provides a revised taxonomic framework for Ramularia and related genera.
  • This reclassification aids in accurate identification of plant pathogens.
  • The findings contribute to better understanding and management of diseases affecting crops like barley, sugar beet, and strawberry.