First record of diatom species Pleurosira laevis (Ehrenberg) Compère for Uzbekistan and Central Asia

Mamanazarova, K.S.; Gololobova, M. A.

doi:10.1134/s2075111717010088

Cited by 4 publications

(5 citation statements)

References 3 publications

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“…Taxonomic implications. The striae per 10 lm of P. laevis reported in previous studies ranges from 12 to 18 in 10 lm (e.g., Bourrelly and Manguin 1952, Al-Saadi et al 1979, Fr ankov a-Koz akov a et al 2007, Cavalcante et al 2013, Mamanazarova and Gololobova 2017, Park et al 2017, with an exceptional case in that P. laevis found in Iran had 9-12/ 10 lm (Sharifinia et al 2016). The striae densities in most of the valves observed in this study, from 13 to 19, fit well within this range.…”

Section: Discussionsupporting

confidence: 85%

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Morphological plasticity in response to salinity change in the euryhaline diatom Pleurosira laevis (Bacillariophyta)

Kamakura

Ashworth

Yamada

et al. 2022

Journal of Phycology

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Pleurosira laevis is a salt-tolerant diatom distributed around the world. The valve of P. laevis has distinct structures called ocelli, which are sharply defined areas with fine, densely packed pores. Two formae of this diatom, P. laevis f. laevis and P. laevis f. polymorpha, are distinguished from each other by their flat or dome-shaped valve faces and degree of elevation of the ocelli, respectively. In this study, we established 4 strains of P. laevis isolated from freshwaters or coastal areas in Japan and the United States, and tracked the formation of newly formed valves with the fluorescent SDVspecific dye PDMPO in culture under several salinity conditions. The result clearly demonstrated the morphological plasticity of the valves, controlled by environmental salinity. The laevis form and polymorpha form valves were produced at salinities of 2 and 7, respectively. The salinity thresholds dictating the morphological plasticity of the valve were consistent in all 4 strains. A similar morphology to the polymorpha form was reproduced in a freshwater medium with the addition of sorbitol, suggesting that osmotic pressure plays a key role in this morphological plasticity. The highly reproducible and easily manipulated change in morphology makes this diatom an ideal model for lab experiments focusing on the molecular and genetic factors involved with valve morphogenesis.

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Section: Discussionsupporting

confidence: 85%

“…2007, Cavalcante et al. 2013, Mamanazarova and Gololobova 2017, Park et al. 2017), with an exceptional case in that P. laevis found in Iran had 9–12/10 μm (Sharifinia et al.…”

Section: Discussionmentioning

confidence: 99%

Morphological plasticity in response to salinity change in the euryhaline diatom Pleurosira laevis (Bacillariophyta)

Kamakura

Ashworth

Yamada

et al. 2022

Journal of Phycology

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“…Later, the species was reported in Europe (Sims 1996;Gómez 2008;Perez et al 2009), Asia (Joh 2010;Karthick & Kociolek 2011;Sharifinia et al 2016) and South America (Metzeltin & García-Rodríguez 2003). Recently, P. laevis was found in the Zarafshan River, which is one of the largest rivers in Uzbekistan (Mamanazarovaa & Gololobova 2017). Pleurosira laevis is mainly associated with brackish or marine environments where its populations grow along with an increase in the chloride levels of the water (Wujek & Welling 1981;Kociolek et al 1983).…”

Section: Brackish and Marine Species In The Analysed Riversmentioning

confidence: 99%

Mining salinisation of rivers: its impact on diatom (Bacillariophyta) assemblages

Bąk¹,

Halabowski²,

Kryk³

et al. 2020

Fottea

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The composition of the diatom assemblages was analysed in four rivers of Upper Silesia, Poland in 2017. The diatom assemblages studied were found to reflect anthropogenic salinization caused by mining activities. The assemblages in those rivers characterised by the highest salinity (Bolina and Mleczna) showed a relatively low taxonomic richness. The diatom assemblages were dominated by species typical of brackish or marine waters. The rivers with a minimal or weak anthropogenic impact (Centuria and Mitręga) supported taxonomically richer diatom assemblages typical of mid-altitude siliceous or calcareous streams (respectively), that have a fine particulate substratum. The presence of a new species, Planothidium nanum sp. nov., was revealed. The new species shows a unique set of morphological characters, including small size; its elliptical outline as well as very widely-spaced central striae on the sternum valve (sinus) and widely-spaced central striae on the raphe valve allow to separate it from other similar Planothidium.

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“…(1861). However, its distribution has been expanded, as documented by more recent reports of first appearances in various regions (e.g., Lake Michigan, US: Wujek & Welling, 1981; Czech Republic: Fránková‐Kozáková et al., 2007; China: Guo‐Feng et al., 2008; Korea: Kim et al., 2008; Uzbekistan: Mamanazarova & Gololobova, 2017). Transposable elements may facilitate the successful invasion of alien species by promoting rapid adaptation to the environment (Stapley et al., 2015).…”

Section: Resultsmentioning

confidence: 97%

Transcriptional responses to salinity‐induced changes in cell wall morphology of the euryhaline diatom Pleurosira laevis

Kamakura,

Bilcke,

Sato

2024

Journal of Phycology

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Diatoms are unicellular algae with morphologically diverse silica cell walls, which are called frustules. The mechanism of frustule morphogenesis has attracted attention in biology and nanomaterials engineering. However, the genetic regulation of the morphology remains unclear. We therefore used transcriptome sequencing to search for genes involved in frustule morphology in the centric diatom Pleurosira laevis, which exhibits morphological plasticity between flat and domed valve faces in salinity 2 and 7, respectively. We observed differential expression of transposable elements (TEs) and transporters, likely due to osmotic response. Up‐regulation of mechanosensitive ion channels and down‐regulation of Ca2+‐ATPases in cells with flat valves suggested that cytosolic Ca2+ levels were changed between the morphologies. Calcium signaling could be a mechanism for detecting osmotic pressure changes and triggering morphological shifts. We also observed an up‐regulation of ARPC1 and annexin, involved in the regulation of actin filament dynamics known to affect frustule morphology, as well as the up‐regulation of genes encoding frustule‐related proteins such as BacSETs and frustulin. Taken together, we propose a model in which salinity‐induced morphogenetic changes are driven by upstream responses, such as the regulation of cytosolic Ca2+ levels, and downstream responses, such as Ca2+‐dependent regulation of actin dynamics and frustule‐related proteins. This study highlights the sensitivity of euryhaline diatoms to environmental salinity and the role of active cellular processes in controlling gross valve morphology under different osmotic pressures.

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First record of diatom species Pleurosira laevis (Ehrenberg) Compère for Uzbekistan and Central Asia

Cited by 4 publications

References 3 publications

Morphological plasticity in response to salinity change in the euryhaline diatom Pleurosira laevis (Bacillariophyta)

Morphological plasticity in response to salinity change in the euryhaline diatom Pleurosira laevis (Bacillariophyta)

Mining salinisation of rivers: its impact on diatom (Bacillariophyta) assemblages

Transcriptional responses to salinity‐induced changes in cell wall morphology of the euryhaline diatom Pleurosira laevis

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