Cargando…
Taxonomic revision of the genus Zygorhizidium: Zygorhizidiales and Zygophlyctidales ord. nov. (Chytridiomycetes, Chytridiomycota)
During the last decade, the classification system of chytrids has dramatically changed based on zoospore ultrastructure and molecular phylogeny. In contrast to well-studied saprotrophic chytrids, most parasitic chytrids have thus far been only morphologically described by light microscopy, hence the...
Autores principales: | , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Westerdijk Fungal Biodiversity Institute
2019
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7250019/ https://www.ncbi.nlm.nih.gov/pubmed/32467913 http://dx.doi.org/10.3114/fuse.2020.05.02 |
_version_ | 1783538695826046976 |
---|---|
author | Seto, K. Van den Wyngaert, S. Degawa, Y. Kagami, M. |
author_facet | Seto, K. Van den Wyngaert, S. Degawa, Y. Kagami, M. |
author_sort | Seto, K. |
collection | PubMed |
description | During the last decade, the classification system of chytrids has dramatically changed based on zoospore ultrastructure and molecular phylogeny. In contrast to well-studied saprotrophic chytrids, most parasitic chytrids have thus far been only morphologically described by light microscopy, hence they hold great potential for filling some of the existing gaps in the current classification of chytrids. The genus Zygorhizidium is characterized by an operculate zoosporangium and a resting spore formed as a result of sexual reproduction in which a male thallus and female thallus fuse via a conjugation tube. All described species of Zygorhizidium are parasites of algae and their taxonomic positions remain to be resolved. Here, we examined morphology, zoospore ultrastructure, host specificity, and molecular phylogeny of seven cultures of Zygorhizidium spp. Based on thallus morphology and host specificity, one culture was identified as Z. willei parasitic on zygnematophycean green algae, whereas the others were identified as parasites of diatoms, Z. asterionellae on Asterionella, Z. melosirae on Aulacoseira, and Z. planktonicum on Ulnaria (formerly Synedra). According to phylogenetic analysis, Zygorhizidium was separated into two distinct order-level novel lineages; one lineage was composed singly of Z. willei, which is the type species of the genus, and the other included the three species of diatom parasites. Zoospore ultrastructural observation revealed that the two lineages can be distinguished from each other and both possess unique characters among the known orders within the Chytridiomycetes. Based on these results, we accommodate the three diatom parasites, Z. asterionellae, Z. melosirae, and Z. planktonicum in the distinct genus Zygophlyctis, and propose two new orders: Zygorhizidiales and Zygophlyctidales. |
format | Online Article Text |
id | pubmed-7250019 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | Westerdijk Fungal Biodiversity Institute |
record_format | MEDLINE/PubMed |
spelling | pubmed-72500192020-05-27 Taxonomic revision of the genus Zygorhizidium: Zygorhizidiales and Zygophlyctidales ord. nov. (Chytridiomycetes, Chytridiomycota) Seto, K. Van den Wyngaert, S. Degawa, Y. Kagami, M. Fungal Syst Evol Article During the last decade, the classification system of chytrids has dramatically changed based on zoospore ultrastructure and molecular phylogeny. In contrast to well-studied saprotrophic chytrids, most parasitic chytrids have thus far been only morphologically described by light microscopy, hence they hold great potential for filling some of the existing gaps in the current classification of chytrids. The genus Zygorhizidium is characterized by an operculate zoosporangium and a resting spore formed as a result of sexual reproduction in which a male thallus and female thallus fuse via a conjugation tube. All described species of Zygorhizidium are parasites of algae and their taxonomic positions remain to be resolved. Here, we examined morphology, zoospore ultrastructure, host specificity, and molecular phylogeny of seven cultures of Zygorhizidium spp. Based on thallus morphology and host specificity, one culture was identified as Z. willei parasitic on zygnematophycean green algae, whereas the others were identified as parasites of diatoms, Z. asterionellae on Asterionella, Z. melosirae on Aulacoseira, and Z. planktonicum on Ulnaria (formerly Synedra). According to phylogenetic analysis, Zygorhizidium was separated into two distinct order-level novel lineages; one lineage was composed singly of Z. willei, which is the type species of the genus, and the other included the three species of diatom parasites. Zoospore ultrastructural observation revealed that the two lineages can be distinguished from each other and both possess unique characters among the known orders within the Chytridiomycetes. Based on these results, we accommodate the three diatom parasites, Z. asterionellae, Z. melosirae, and Z. planktonicum in the distinct genus Zygophlyctis, and propose two new orders: Zygorhizidiales and Zygophlyctidales. Westerdijk Fungal Biodiversity Institute 2019-08-21 2020-06 /pmc/articles/PMC7250019/ /pubmed/32467913 http://dx.doi.org/10.3114/fuse.2020.05.02 Text en © 2020 Westerdijk Fungal Biodiversity Institute http://creativecommons.org/licenses/by-nc-nd/4.0/legalcode Fungal Systematics and Evolution is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License |
spellingShingle | Article Seto, K. Van den Wyngaert, S. Degawa, Y. Kagami, M. Taxonomic revision of the genus Zygorhizidium: Zygorhizidiales and Zygophlyctidales ord. nov. (Chytridiomycetes, Chytridiomycota) |
title | Taxonomic revision of the genus Zygorhizidium: Zygorhizidiales and Zygophlyctidales ord. nov. (Chytridiomycetes, Chytridiomycota) |
title_full | Taxonomic revision of the genus Zygorhizidium: Zygorhizidiales and Zygophlyctidales ord. nov. (Chytridiomycetes, Chytridiomycota) |
title_fullStr | Taxonomic revision of the genus Zygorhizidium: Zygorhizidiales and Zygophlyctidales ord. nov. (Chytridiomycetes, Chytridiomycota) |
title_full_unstemmed | Taxonomic revision of the genus Zygorhizidium: Zygorhizidiales and Zygophlyctidales ord. nov. (Chytridiomycetes, Chytridiomycota) |
title_short | Taxonomic revision of the genus Zygorhizidium: Zygorhizidiales and Zygophlyctidales ord. nov. (Chytridiomycetes, Chytridiomycota) |
title_sort | taxonomic revision of the genus zygorhizidium: zygorhizidiales and zygophlyctidales ord. nov. (chytridiomycetes, chytridiomycota) |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7250019/ https://www.ncbi.nlm.nih.gov/pubmed/32467913 http://dx.doi.org/10.3114/fuse.2020.05.02 |
work_keys_str_mv | AT setok taxonomicrevisionofthegenuszygorhizidiumzygorhizidialesandzygophlyctidalesordnovchytridiomyceteschytridiomycota AT vandenwyngaerts taxonomicrevisionofthegenuszygorhizidiumzygorhizidialesandzygophlyctidalesordnovchytridiomyceteschytridiomycota AT degaway taxonomicrevisionofthegenuszygorhizidiumzygorhizidialesandzygophlyctidalesordnovchytridiomyceteschytridiomycota AT kagamim taxonomicrevisionofthegenuszygorhizidiumzygorhizidialesandzygophlyctidalesordnovchytridiomyceteschytridiomycota |