Diversity and Hidden Host Specificity of Chytrids Infecting Colonial Volvocacean Algae

The Journal of Eukaryotic Microbiology
Silke Van den WyngaertHans-Peter Grossart

Abstract

Chytrids are zoosporic fungi that play an important, but yet understudied, ecological role in aquatic ecosystems. Many chytrid species have been morphologically described as parasites on phytoplankton. However, the majority of them have rarely been isolated and lack DNA sequence data. In this study we isolated and cultivated three parasitic chytrids, infecting a common volvocacean host species, Yamagishiella unicocca. To identify the chytrids, we characterized morphology and life cycle, and analyzed phylogenetic relationships based on 18S and 28S rDNA genes. Host range and specificity of the chytrids was determined by cross-infection assays with host strains, characterized by rbcL and ITS markers. We were able to confirm the identity of two chytrid strains as Endocoenobium eudorinae Ingold and Dangeardia mamillata Schröder and described the third chytrid strain as Algomyces stechlinensis gen. et sp. nov. The three chytrids were assigned to novel and phylogenetically distant clades within the phylum Chytridiomycota, each exhibiting different host specificities. By integrating morphological and molecular data of both the parasitic chytrids and their respective host species, we unveiled cryptic host-parasite associations. This stu...Continue Reading

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Citations

Nov 22, 2019·Frontiers in Microbiology·Cassandra L Ettinger, Jonathan A Eisen
Mar 16, 2019·Nature Reviews. Microbiology·Hans-Peter GrossartKeilor Rojas-Jimenez
Feb 13, 2019·The ISME Journal·B T HassettR Gradinger
Jun 3, 2021·Proceedings of the National Academy of Sciences of the United States of America·Isabell KlawonnAnne E Dekas

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