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MAP  >  Studies in Fungi
2018 Volume 3
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ARTICLE   Open Access    

Taxonomic circumscription and phylogenetics of novel didymellaceous taxa with brown muriform spores

  • 1.

    Key Laboratory for Plant Biodiversity and Biogeography of East Asia(KLPB), Kunming Institute of Botany, Chinese Academy of Science, Kunming 650201, Yunnan China

  • 2.

    Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, 57100, Thailand

  • 3.

    World Agro Forestry Centre, East and Central Asia, 132 Lanhei Road, Kunming 650201, Yunnan China

  • 4.

    Department of Health Sciences, Faculty of Science, University of Mauritius, Reduit, Mauritius

  • 5.

    AG Geobotany, Faculty of Biology and Biotechnology, Ruhr-Universitat Bochum, Universitatsstraß

  • 6.

    Nantgaredig, 33 B St. Edwards Road, Southsea, Hants., PO5 3DH, UK

  • 7.

    Società

  • 8.

    A. M. B. Gruppo Micologico Forlivese "Antonio Cicognani", Via Roma 18, Forlì

  • 9.

    A. M. B. Circolo Micologico "Giovanni Carini", C. P. 314, Brescia, Italy

  • 10.

    Russian Research Institute of Floriculture and Subtropical Crops, Sochi, 354002, Yana Fabritsiusa street, 2/28, Krasnodar region, Russia

  • 11.

    Laboratory of Mycology, Institute of Botany, Academy of Sciences of the Republic of Uzbekistan, 32 Durmon yuli Street, Tashkent 100125, Uzbekistan

More Information
  • Sexual morph of didymellaceous taxa are characterized by their ascomata with relatively thin peridium, cylindric-clavate to clavate, short-pedicellate or apedicellate asci, hyaline to brown, 1-septate to muriform ascospores. Its asexual morphs are coelomycetous and comprising pycnidial or acervulus conidiomata, phialidic, hyaline conidiogenous cells and hyaline or pale brown, septate or aseptate conidia. The majority of these cosmopolitan species are plant associated fungi which can be pathogens on a wide range of hosts and some species are of particular relevance for quarantine measures. Recent studies have significantly improved the taxonomy and systematics of didymellaceous taxa based on molecular phylogenetics. In contrast to the accurate and detailed studies on the asexual morphs which are common obligate pathogens, information on their usually saprobic sexual morphs is still limited. Among these phenotypically diverse species, spore characteristics are quite unique as most have hyaline spores with 0-1 septum, while only Neomicrosphaeropsis and Didymellocamarosporium are reported as producing pigmented, muriform spores. These dematiaceous muriform spores are characteristic of a considerable number of species that may be quite divergent in other characters. During taxonomic investigations on the diversity of didymellaceous taxa, we have isolated species from Alhagi pseudalhagi, Coronilla emerus, Cytisus sp., Elaeagnus angustifolia and Spartium junceum in Italy, Russia and Uzbekistan. A comprehensive phylogeny, based on four loci (ITS, LSU, rpb2 and tub2) is used to infer species relationships. Comprehensive morphological descriptions and in-depth phylogenetic investigations of five new species viz. Ascochyta coronillae-emeri, Microsphaeropsis spartii-juncei, Neomicrosphaeropsis alhagi-pseudalhagi, N. cytisicola and N. elaeagni are presented.
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    DN Wanasinghe, R Jeewon, D Peršoh, EBG Jones, E Camporesi, TS Bulgakov, YS Gafforov, KD Hyde. 2018. Taxonomic circumscription and phylogenetics of novel didymellaceous taxa with brown muriform spores. Studies in Fungi 3(1):152−175 doi: 10.5943/sif/3/1/17
    DN Wanasinghe, R Jeewon, D Peršoh, EBG Jones, E Camporesi, TS Bulgakov, YS Gafforov, KD Hyde. 2018. Taxonomic circumscription and phylogenetics of novel didymellaceous taxa with brown muriform spores. Studies in Fungi 3(1):152−175 doi: 10.5943/sif/3/1/17
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ARTICLE   Open Access    

Taxonomic circumscription and phylogenetics of novel didymellaceous taxa with brown muriform spores

  • 1.

    Key Laboratory for Plant Biodiversity and Biogeography of East Asia(KLPB), Kunming Institute of Botany, Chinese Academy of Science, Kunming 650201, Yunnan China

  • 2.

    Center of Excellence in Fungal Research, Mae Fah Luang University, Chiang Rai, 57100, Thailand

  • 3.

    World Agro Forestry Centre, East and Central Asia, 132 Lanhei Road, Kunming 650201, Yunnan China

  • 4.

    Department of Health Sciences, Faculty of Science, University of Mauritius, Reduit, Mauritius

  • 5.

    AG Geobotany, Faculty of Biology and Biotechnology, Ruhr-Universitat Bochum, Universitatsstraß

  • 6.

    Nantgaredig, 33 B St. Edwards Road, Southsea, Hants., PO5 3DH, UK

  • 7.

    Società

  • 8.

    A. M. B. Gruppo Micologico Forlivese "Antonio Cicognani", Via Roma 18, Forlì

  • 9.

    A. M. B. Circolo Micologico "Giovanni Carini", C. P. 314, Brescia, Italy

  • 10.

    Russian Research Institute of Floriculture and Subtropical Crops, Sochi, 354002, Yana Fabritsiusa street, 2/28, Krasnodar region, Russia

  • 11.

    Laboratory of Mycology, Institute of Botany, Academy of Sciences of the Republic of Uzbekistan, 32 Durmon yuli Street, Tashkent 100125, Uzbekistan

  • Received: 04 March 2018
  • Revised: 28 May 2018
  • Published online: 28 June 2018
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Studies in Fungi  3,  Article number: 17  (2018)  |  Cite this article

Abstract: Sexual morph of didymellaceous taxa are characterized by their ascomata with relatively thin peridium, cylindric-clavate to clavate, short-pedicellate or apedicellate asci, hyaline to brown, 1-septate to muriform ascospores. Its asexual morphs are coelomycetous and comprising pycnidial or acervulus conidiomata, phialidic, hyaline conidiogenous cells and hyaline or pale brown, septate or aseptate conidia. The majority of these cosmopolitan species are plant associated fungi which can be pathogens on a wide range of hosts and some species are of particular relevance for quarantine measures. Recent studies have significantly improved the taxonomy and systematics of didymellaceous taxa based on molecular phylogenetics. In contrast to the accurate and detailed studies on the asexual morphs which are common obligate pathogens, information on their usually saprobic sexual morphs is still limited. Among these phenotypically diverse species, spore characteristics are quite unique as most have hyaline spores with 0-1 septum, while only Neomicrosphaeropsis and Didymellocamarosporium are reported as producing pigmented, muriform spores. These dematiaceous muriform spores are characteristic of a considerable number of species that may be quite divergent in other characters. During taxonomic investigations on the diversity of didymellaceous taxa, we have isolated species from Alhagi pseudalhagi, Coronilla emerus, Cytisus sp., Elaeagnus angustifolia and Spartium junceum in Italy, Russia and Uzbekistan. A comprehensive phylogeny, based on four loci (ITS, LSU, rpb2 and tub2) is used to infer species relationships. Comprehensive morphological descriptions and in-depth phylogenetic investigations of five new species viz. Ascochyta coronillae-emeri, Microsphaeropsis spartii-juncei, Neomicrosphaeropsis alhagi-pseudalhagi, N. cytisicola and N. elaeagni are presented.

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    DN Wanasinghe, R Jeewon, D Peršoh, EBG Jones, E Camporesi, TS Bulgakov, YS Gafforov, KD Hyde. 2018. Taxonomic circumscription and phylogenetics of novel didymellaceous taxa with brown muriform spores. Studies in Fungi 3(1):152−175 doi: 10.5943/sif/3/1/17
    DN Wanasinghe, R Jeewon, D Peršoh, EBG Jones, E Camporesi, TS Bulgakov, YS Gafforov, KD Hyde. 2018. Taxonomic circumscription and phylogenetics of novel didymellaceous taxa with brown muriform spores. Studies in Fungi 3(1):152−175 doi: 10.5943/sif/3/1/17
    shu

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