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Original Research ARTICLE Provisionally accepted The full-text will be published soon. Notify me

Front. Microbiol. | doi: 10.3389/fmicb.2019.00840

Phylogenetic revision of Savoryellaceae and evidence for its ranking as a subclass

 Monika C. Dayarathne1, 2, 3,  Sajeewa S. Maharachchikumbura4,  E. B. Gareth Jones5, Dong Wei1,  Bandarupalli Devadatha6, Jing Yang1, Hasini Ekanayake1, Wasana De Silva7,  Vemuri V. Sarma6,  Abdullah M. Al-Sadi8, Kitiphong Khongphinitbunjong9,  Kevin D. Hyde2, 3, 10 and  Rui-Lin Zhao11*
  • 1Center of Excellence in Fungal Research,, Mae Fah Luang University, Thailand
  • 2World Agroforestry Centre, China
  • 3Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, China
  • 4Department of Marine Science and Fisheries, College of Agricultural and Marine Sciences, Sultan Qaboos University, Oman
  • 5Division of Plant Pathology, Department of Entomology and Plant Pathology, Faculty of Agriculture,, Chiang Mai University, Thailand
  • 6Department of Biotechnology, School of Life Sciences,, Pondicherry University, India
  • 7Donghu Experimental Station of Lake Ecosystem,, State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology (CAS), China
  • 8Department of Crop Sciences, College of Agricultural and Marine Sciences,, Sultan Qaboos University, Oman
  • 9School of Science, Mae Fah Luang University, Thailand
  • 10Center of Excellence in Fungal Research, Mae Fah Luang University, Thailand
  • 11Chinese Academy of Sciences, State Key Laboratory of Mycology, Institute of Microbiology (CAS), China

Morpho-molecular and molecular clock analyses were conducted on Savoryellaceae in order to understand the placements of taxa in this family. Ascotaiwania and Neoascotaiwania formed a well-supported monophyletic clade in the phylogenetic analyses of concatenated partial 18S rDNA, 28S rDNA, transcription elongation factor 1-α and RNA polymerase II gene data. These two genera share similar morphological features, especially in their asexual morphs, indicating that they are congeneric. Hence, we synonymize Neoascotaiwania under Ascotaiwania. Ascotaiwania hughesii (and its asexual morph, Helicoon farinosum) and Monotosporella setosa grouped in a clade sister to Pleurotheciales and are excluded from Ascotaiwania which becomes monophyletic. A novel genus Helicoascotaiwania is introduced to accommodate Ascotaiwania hughesii and its asexual morph, Helicoon farinosum. A novel species, Savoryella yunnanensis is introduced from a freshwater habitat in Yunnan Province, China. Comprehensive descriptions and morphographs are provided for taxa in this family. In addition, we provide evolutionary divergence estimates for Savoryellomycetidae taxa and major marine based taxa to support our phylogenetic and morphological investigations. The taxonomic placement of these marine-based taxa is briefly discussed. Our results indicate that the most basal group of marine-based taxa are represented within Lulworthiales, which diverged from ancestral Sordariomycetes around 149 MYA (91–209) and Savoryellomycetidae around 213 MYA (198–303)

Keywords: freshwater, marine, morphology, phylogeny, Savoryellomycetidae, Taxonomy

Received: 14 Jan 2019; Accepted: 02 Apr 2019.

Edited by:

Baokai Cui, Beijing Forestry University, China

Reviewed by:

Zheng Wang, Yale University, United States
Somayeh Dolatabadi, Westerdijk Fungal Biodiversity Institute, Netherlands  

Copyright: © 2019 Dayarathne, Maharachchikumbura, Jones, Wei, Devadatha, Yang, Ekanayake, De Silva, Sarma, Al-Sadi, Khongphinitbunjong, Hyde and Zhao. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Prof. Rui-Lin Zhao, State Key Laboratory of Mycology, Institute of Microbiology (CAS), Chinese Academy of Sciences, Beijing, 100101, Beijing Municipality, China, zhaorl@im.ac.cn