Ecology and Evolution of Marine Diatoms and Parmales

Kuwata, Akira; Jewson, David H.

doi:10.1007/978-4-431-55130-0_10

Cited by 7 publications

(2 citation statements)

References 148 publications

(124 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Pennate diatoms adhere to substances, whereas centric diatoms can change their buoyancy and habitat vertically. 82 Therefore, pennate diatoms likely acquired an additional mechanism for detoxification of harmful oxidative compounds, in contrast to centric diatoms, which can avoid oxidative stress by vertical migration. These findings suggest that ecotoxicological tests performed using pennate diatoms can underestimate the level of toxicity caused by metals and some medicines, such as bleomycin, compared to those performed using centric diatoms.…”

Section: Resultsmentioning

confidence: 99%

Rapid transcriptomic and physiological changes in the freshwater pennate diatomMayamaea pseudoterrestrisin response to copper exposure

et al. 2022

View full text Add to dashboard Cite

Diatoms function as major primary producers, accumulating large amounts of biomass in most aquatic environments. Given their rapid responses to changes in environmental conditions, diatoms are used for the biological monitoring of water quality and for performing ecotoxicological tests in aquatic ecosystems. However, the molecular basis for their toxicity to chemical compounds remains largely unknown. Here, we sequenced the genome of a freshwater diatom, Mayamaea pseudoterrestris NIES-4280, which has been proposed as an alternative strain of Navicula pelliculosa UTEX 664 for performing the Organisation for Economic Co-operation and Development ecotoxicological test. This study shows that M. pseudoterrestris has a small genome and carries the lowest number of genes among freshwater diatoms. The gene content of M. pseudoterrestris is similar to that of the model marine diatom, Phaeodactylum tricornutum. Genes related to cell motility, polysaccharide metabolism, oxidative stress alleviation, intracellular calcium signaling, and reactive compound detoxification showed rapid changes in their expression patterns in response to copper exposure. Active gliding motility was observed in response to copper addition, and copper exposure decreased intracellular calcium concentration. These findings enhance our understanding of the environmental adaptation of diatoms, and elucidate the molecular basis of toxicity of chemical compounds in algae.

show abstract

Section: Resultsmentioning

confidence: 99%

Rapid transcriptomic and physiological changes in the freshwater pennate diatomMayamaea pseudoterrestrisin response to copper exposure

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Changing the buoyancy is one of the main strategies of diatoms to adapt to marine environments 48 . In the SCM, genes for phospholipid:diacylglycerol acyltransferase (PDAT), which is involved in triacylglycerol synthesis from phospholipid 49 , were induced in T. nordenskioeldii and C. debilis (Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

Depth-dependent transcriptomic response of diatoms during spring bloom in the western subarctic Pacific Ocean

Suzuki

Kataoka

Watanabe

et al. 2019

Sci Rep

Self Cite

View full text Add to dashboard Cite

Diatoms play important roles in primary production and carbon transportation in various environments. Large-scale diatom bloom occurs worldwide; however, metabolic responses of diatoms to environmental conditions have been little studied. Here, we targeted the Oyashio region of the western subarctic Pacific where diatoms bloom every spring and investigated metabolic response of major diatoms to bloom formation by comparing metatranscriptomes between two depths corresponding to different bloom phases. Thalassiosira nordenskioeldii and Chaetoceros debilis are two commonly occurring species at the study site. The gene expression profile was drastically different between the surface (late decline phase of the bloom; 10 m depth) and the subsurface chlorophyll maximum (SCM, initial decline phase of the bloom; 30 m depth); in particular, both species had high expression of genes for nitrate uptake at the surface, but for ammonia uptake at the SCM. Our culture experiments using T. nordenskioeldii imitating the environmental conditions showed that gene expression for nitrate and ammonia transporters was induced by nitrate addition and active cell division, respectively. These results indicate that the requirement for different nitrogen compounds is a major determinant of diatom species responses during bloom maturing.

show abstract

Bolidophyceae

Jordan¹,

Fujita²,

Konno³

et al. 2019

Encyclopedia of Life Sciences

View full text Add to dashboard Cite

The marine microalgal class Bolidophyceae is a sister group to the diatoms and includes motile naked (bolidomonad) cells and nonmotile siliceous plate‐bearing (parmalean) cells. The bolidomonad cell possesses two unequal flagella, a long one bearing mastigonemes (tubular hairs) and a shorter smooth one, with the basal apparatus reduced to basal bodies. The parmalean cell wall is composed of 5–8 interlocking siliceous plates, which exhibit distinct dorsal, ventral, shield and girdle plate morphologies. Both cell types have a chloroplast (including the major carotenoid fucoxanthin and chlorophylls a + c 1 + c 2 + c 3 ) with a girdle lamella, Golgi body, nucleus, mitochondrion and large vacuole. The group currently includes approximately 30 taxa, mostly described from high latitudes, although some tropical species also have been reported. Parmalean algae reach high absolute abundances in the spring, but later in the summer, they sink to the pycnocline (a layer of maximum water density difference) – a strategy similar to the centric diatoms. Their rare occurrences in sediment trap and surface sediments suggest that the siliceous plates are mostly recycled in the photic zone, yet plates of parmalean algae have been discovered in older sediments, although their true stratigraphic distribution remains unknown. Key Concepts Recent gene sequence analyses have shown that the genus Bolidomonas is polyphyletic, forming several clades, one of which includes the Parmales, resulting in all Bolidomonas species being transferred to Triparma . The Bolidophyceae is a sister group to the diatoms, with similar cell features and pigment composition. Bolidomonad cells are motile and naked, while the nonmotile parmalean cells are covered by 5–8 silicified plates, consisting of three or four types (shield, girdle, ventral and/or dorsal), arranged in a particular pattern and with distinct morphology, which defines each genus. At present, the ploidy level or life cycle has not been identified; however, it is possible that the nonmotile silica plate‐bearing cells are diploid and alternate with a naked bolidomonad‐like flagellate haploid stage. Naked bolidomonads appear to be present throughout the World's oceans, while most parmalean taxa inhabit high latitude areas, although tropical taxa also exist. Studies have shown the parmalean ecology is similar to that of the centric diatoms, with assemblages remaining in their silicified form throughout the year and sinking to the pycnocline in the summer. Remains of parmalean cells found in the fossil record suggest at least an early Cenozoic origin. If the bolidophytes are haplodiplontic and represent an ancestral stage to the diplontic diatoms, then future molecular clock calculations should reveal a much older origin, possibly as old as the late Paleozoic (as diatoms are believed to have diverged around the Permian–Triassic boundary).

show abstract

Ecology and Evolution of Marine Diatoms and Parmales

Cited by 7 publications

References 148 publications

Rapid transcriptomic and physiological changes in the freshwater pennate diatomMayamaea pseudoterrestrisin response to copper exposure

Rapid transcriptomic and physiological changes in the freshwater pennate diatomMayamaea pseudoterrestrisin response to copper exposure

Depth-dependent transcriptomic response of diatoms during spring bloom in the western subarctic Pacific Ocean

Bolidophyceae

Contact Info

Product

Resources

About