Hyphochytriomycota and Oomycota

Beakes, Gordon W.; Thines, Marco

doi:10.1007/978-3-319-28149-0_26

Cited by 47 publications

(30 citation statements)

References 284 publications

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“…How saprotrophy arises in oomycetes is, however, not yet clear and depends strongly on the character of the last common ancestor of oomycetes. Two hypotheses have been considered: i) the last common ancestor was a pathogen and the saprotrophic lineages have arisen several times independently or ii) saprotrophy is the ancestral state in oomycetes [8].…”

Section: Introductionmentioning

confidence: 99%

Comparative analyses of saprotrophy in Salisapilia sapeloensis and diverse plant pathogenic oomycetes reveal lifestyle-specific gene expression

Vries¹,

Vries

Archibald³

et al. 2019

Preprint

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Section: Introductionmentioning

confidence: 99%

Comparative analyses of saprotrophy in Salisapilia sapeloensis and diverse plant pathogenic oomycetes reveal lifestyle-specific gene expression

Vries¹,

Vries

Archibald³

et al. 2019

Preprint

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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%

“…Oomycota have cell walls comprised of cellulose derivatives that serve as structural components, as opposed to chitin in true Fungi (Thines 2018). Oomycota are a genetically and morphologically diverse clade that contains at least 1500 species in 100 genera that can form hyphae or exist as simple holocarpic thalli (Beakes and Thines 2017). Members of Oomycota are known pathogens of nematodes (Phillips et al 2008), zooplankton (Thomas et al 2010), micro-algae (Thines et al 2015, Buaya et al 2017), and fish (van West 2006.…”

Section: Introductionmentioning

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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“…Oomycetes are fungal‐like eukaryotic protists composed of approximately 1500 or more species and grouped approximately into 100 genera (Beakes and Thines ). These organisms are osmotrophic and some species are either biotrophic, hemibiotrophic‐phytopathogens or saprotrophs in the estuarine systems.…”

Section: Introductionmentioning

confidence: 99%

Growth and fatty acid profiles ofHalophytophthoravesiculaandSalispinaspinosafrom Philippine mangrove leaves

Caguimbal

Devanadera

Bennett

et al. 2019

Lett Appl Microbiol

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Studies on marine‐sourced fatty acids have gathered significant interest recently as an important component of aquaculture feeds and of biofuel production. Of the organisms capable of producing fatty acids, marine oomycetes are promising model organisms. One group of marine oomycetes are the Halophytophthora spp. which is known to have an important role in leaf decomposition, thereby changing the plant debris into exudates which are usable to consumers in the mangrove ecosystems. This study reports the three mangrove oomycetes isolated from Philippine mangrove forests, identified herein as Halophytophthora vesicula AK1YB2 (Aklan), H. vesicula PQ1YB3 (Quezon) and Salispina spinosa ST1YB3 (Davao del Norte). These isolates were subjected to growth analyses using varying incubation parameters (salinity level and pH), and for fatty acid production. Results revealed the presence of different fatty acids such as Arachidonic acid, Linoleic acid and Vaccenic acid when grown on V8S and PYGS media. This study is the first observation of fatty acids from S. spinosa and H. vesicula from the Philippines. Significance and Impact of the Study Tropical Philippines straddling west of the Pacific Ocean and East of South China Sea is rich in marine and estuarine oomycetes. These micro‐organisms, hitherto poorly known and unstudied in the country, play an important role in the nutritive cycle of the mangrove ecosystem. Due to the increasing demand for an alternative source of fatty acids, species of Oomycetes isolated from select mangrove forests in Luzon, Visayas and Mindanao were analysed for their fatty acid contents. Prospects for industrially‐important fatty acids make these Oomycetes all‐important to study in applied microbiology in the Philippine setting where these structurally simple micro‐organisms abound.

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Hyphochytriomycota and Oomycota

Cited by 47 publications

References 284 publications

Comparative analyses of saprotrophy in Salisapilia sapeloensis and diverse plant pathogenic oomycetes reveal lifestyle-specific gene expression

Comparative analyses of saprotrophy in Salisapilia sapeloensis and diverse plant pathogenic oomycetes reveal lifestyle-specific gene expression

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

Growth and fatty acid profiles ofHalophytophthoravesiculaandSalispinaspinosafrom Philippine mangrove leaves

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