Filamentous brown algae infected by the marine, holocarpic oomycete<i>Eurychasma dicksonii</i>

Tsirigoti, Amerssa; Kuepper, Frithjof C.; Gachon, Claire M. M.; Katsaros, Christos

doi:10.4161/psb.26367

Cited by 6 publications

(2 citation statements)

References 18 publications

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“…In the marine environment, the diversity and functioning of Oomycota is poorly understood. However, many Oomycota are described as pathogens of algae (Beakes and Thines 2017, Tsirigoti et al 2013, Li et al 2010). In the Arctic Ocean and other high-latitude environments, reports of Oomycota are sparse and sporadic; consequently, the diversity, functioning, and general ecology of this important group of organisms is largely unknown.…”

Section: Discussionmentioning

confidence: 99%

A glimpse into the biogeography, seasonality, and ecological functions of arctic marine Oomycota

Hassett¹,

Thines

Buaya

et al. 2019

IMA Fungus

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High-latitude environments are warming, leading to changes in biological diversity patterns of taxa. Oomycota are a group of fungal-like organisms that comprise a major clade of eukaryotic life and are parasites of fish, agricultural crops, and algae. The diversity, functionality, and distribution of these organisms are essentially unknown in the Arctic marine environment. Thus, it was our aim to conduct a first screening, using a functional gene assay and high-throughput sequencing of two gene regions within the 18S rRNA locus to examine the diversity, richness, and phylogeny of marine Oomycota within Arctic sediment, seawater, and sea ice. We detected Oomycota at every site sampled and identified regionally localized taxa, as well as taxa that existed in both Alaska and Svalbard. While the recently described diatom parasite Miracula helgolandica made up about 50% of the oomycete reads found, many lineages were observed that could not be assigned to known species, including several that clustered with another recently described diatom parasite, Olpidiopsis drebesii. Across the Arctic, Oomycota comprised a maximum of 6% of the entire eukaryotic microbial community in Barrow, Alaska May sediment and 10% in sea ice near the Svalbard archipelago. We found Arctic marine Oomycota encode numerous genes involved in parasitism and carbon cycling processes. Ultimately, these data suggest that Arctic marine Oomycota are a reservoir of uncharacterized biodiversity, the majority of which are probably parasites of diatoms, while others might cryptically cycle carbon or interface other unknown ecological processes. As the Arctic continues to warm, lower-latitude Oomycota might migrate into the Arctic Ocean and parasitize non-coevolved hosts, leading to incalculable shifts in the primary producer community.

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Section: Discussionmentioning

confidence: 99%

A glimpse into the biogeography, seasonality, and ecological functions of arctic marine Oomycota

Hassett¹,

Thines

Buaya

et al. 2019

IMA Fungus

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“…2008a ) and that a pathogen of the toxic diatom Pseudo-nitzschia pungens was abundant and thus a potential regulator of harmful algal blooms ( Hanic et al 2009 ). Since then, efforts have been taken to rediscover the holocarpic parasites of brown algae ( Tsirigoti et al . 2013 , Strittmatter et al .…”

Section: Introductionmentioning

confidence: 99%

Bolbea parasitica gen. et sp. nov., a cultivable holocarpic parasitoid of the early-diverging Saprolegniomycetes

Buaya

Thines

2020

Fungal Systematics and Evolution

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Holocarpic oomycetes convert their entire cytoplasm into zoospores and thus do not form dedicated sporangia or hyphal compartments for asexual reproduction. The majority of holocarpic oomycetes are obligate parasites and parasitoids of a diverse suite of organisms, among them green and red algae, brown seaweeds, diatoms, fungi, oomycetes and invertebrates. Most of them are found among the early diverging oomycetes or the Peronosporomycetes, and some in the early-diverging Saprolegniomycetes (Leptomitales). The obligate parasitism renders it difficult to study some of these organisms. Only a few members of the genus Haliphthoros s. l. have been cultured without their hosts, and of the parasitoid Leptomitales, some transient cultures have been established, which are difficult to maintain. Here, the cultivation of a new holocarpic oomycete genus of the Leptomitales, Bolbea, is presented. Bolbea is parasitic to ostracods, is readily cultivable on malt extract agar, and upon contact with water converts its cytoplasm into zoospores. Its morphology and phylogenetic relationships are reported. Due to the ease of cultivation and the ready triggering of zoospore development, similar to some lagenidiaceous oomycetes, the species could be a promising model to study sporulation processes in detail.

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Host-Parasite interaction between brown algae and eukaryote biotrophic pathogens

Santhosh,

Neuhauser

2024

Current Research in Microbial Sciences

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Filamentous brown algae infected by the marine, holocarpic oomyceteEurychasma dicksonii

Cited by 6 publications

References 18 publications

A glimpse into the biogeography, seasonality, and ecological functions of arctic marine Oomycota

A glimpse into the biogeography, seasonality, and ecological functions of arctic marine Oomycota

Bolbea parasitica gen. et sp. nov., a cultivable holocarpic parasitoid of the early-diverging Saprolegniomycetes

Host-Parasite interaction between brown algae and eukaryote biotrophic pathogens

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