Morphological and physiological alterations in the diatom Gomphonema pseudoaugur due to heavy metal stress

Gautam, Shristy; Pandey, Lakshman; Vinayak, Vandana; Arya, Aditi

doi:10.1016/j.ecolind.2016.08.002

Cited by 54 publications

(20 citation statements)

References 36 publications

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“…The same results were recently obtained by Park et al (2020) who observed a significant increase in lipid bodies volume in the genera Amphora Ehrenberg ex Kützing and Nitzschia Hassall, as response to Cu contamination. Another study statistically confirmed a positive correlation between trace metal contamination (especially Pb and Se) and lipid bodies production in Gomphonema pseudoaugur Lange-Bertalot, which also resulted as one of the most resistant species in communities exposed to such impairment (Gautam et al, 2017). Again, Antoni et al (2020) observed bigger lipid bodies in cells treated with Zn than control ones.…”

Section: Introductionmentioning

confidence: 74%

Looking back, looking forward: a review of the new literature on diatom teratological forms (2010–2020)

et al. 2021

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Over the last years, issues concerning diatom teratological forms and environmental stress have received growing interest within the scientific community. Publications on this topic dated back to 1890 and were summarized in a review published in 2009 by the journal Hydrobiologia, accounting for high citation rates (i.e. 117 citations Scopus and 232 citations Google Scholar, October 2020). This wide interest stimulates the authors to further unravel teratological forms significance in the light of the most recent publications (2010–2020). Diatom teratological forms are one of the best individual-level biomarkers since they provide a rapid response to several environmental stressors, including new emerging pollutants. The mechanisms involved in teratological valve likely involve both cytoskeleton and silicon metabolic pathway impairments. However, teratologies do not seem to weaken the reproduction capacity and viability of the affected individuals. We recognized eight types of teratologies as involving different parts of the valve, depending on genus. In order to summarize the information obtained by several years of research, we suggest a four-step procedure aimed at providing a theoretical pathway that researchers should follow to better explain results obtained in next-future studies and representing a starting point for the development of an environmental index based on teratological forms.

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Section: Introductionmentioning

confidence: 74%

Looking back, looking forward: a review of the new literature on diatom teratological forms (2010–2020)

et al. 2021

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“…Green algae and diatoms are known for storing lipid level up to 50% as a reserve food material under stress condition [28,38]. Higher lipid contents in green algae and diatoms under heavy metals or nanoparticles stress have been reported [28,38]. Under stress condition, algal cells tend to adjust the cellular metabolism and store more large molecules such as proteins and lipid [10].…”

Section: Discussionmentioning

confidence: 99%

Effect of Silver Nanoparticles on Tropical Freshwater and Marine Microalgae

Pham

2019

Journal of Chemistry

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The increase in synthesis and application of silver nanoparticles (AgNPs) in the last decade has resulted in contamination of AgNPs in the aquatic environment. The presence of AgNPs in aquatic environments has posed toxic effects to aquatic organisms and ecological damage. In this study, two tropical microalgae species including the freshwater Scenedesmus sp. and the marine diatom Thalassiosira sp. were employed to examine the toxic effects of AgNPs. The toxic effects were determined by analyzing different end points, such as half maximal effective concentration (EC50), algae growth inhibition, algae cell size, chlorophyll-a content, and total lipid accumulation. The results suggested that AgNPs presented different toxicity mechanisms for microalgae and showed to be more toxic in freshwater than in marine environment. The EC50 values of AgNPs after 72 h for the growth inhibition of Scenedesmus sp. and Thalassiosira sp. were 89.92 ± 9.68 and 107.21 ± 7.43 μg/L, respectively. AgNPs at a certain concentration have resulted in change in cell diameter, reduction in chlorophyll-a content, and enhancement of the total lipid production in the tested microalgae. Thus, local species should be involved in the toxic assessment. This research contributes on understanding the toxicity of AgNPs on freshwater and marine environments.

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“…Marine environment is aggressive towards plastics, polymers, glass and metals which are hazardous for marine life 40 , 41 . Earlier we reported how morphology of diatom, Gomphonema augur, showed valve deformation due to presence of trace metal analytes in water 42 . It is well established that different types of environmental pollutants influence diatom cell density, lipid composition and morphology 43 .…”

Section: Introductionmentioning

confidence: 87%

Exopolysaccharides directed embellishment of diatoms triggered on plastics and other marine litter

Khan

Singh

Shewani

et al. 2020

Sci Rep

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In the present study, embellishment or beautification of diatoms on substrates like plastics, polydimethylsiloxane, graphite, glass plate, and titanium dioxide, triggered by exopolysaccharides was examined under laboratory conditions. Exopolysaccharides are secreted mainly by primary colonisers, bacteria, which is succeeded by secondary colonisers i.e. diatoms. Both diatom (Nitzschia sp.4) and bacteria (Bacillus subtilis) were exposed with substrates separately for 30 days. Diatoms adhere on substrates strongly, not only because of surface roughness of different substrates but also the nanoporous architecture of diatoms which enhanced their embellishment. This study attempted to identify the substrates that adhere to diatoms strongly and was mainly analyzed by scanning electron microscope and further the observations are well supported by math work software (MATLAB). The variation of diatom’s binding on different substrates is due to the influence of marine litters on diatom population in ocean beds where they undergo slow degradation releasing macro, micro and nanoparticles besides radicals and ions causing cell death. Therefore a proof-of-concept model is developed to successfully deliver a message concerning benefit of using different diatom species.

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Morphological and physiological alterations in the diatom Gomphonema pseudoaugur due to heavy metal stress

Cited by 54 publications

References 36 publications

Looking back, looking forward: a review of the new literature on diatom teratological forms (2010–2020)

Looking back, looking forward: a review of the new literature on diatom teratological forms (2010–2020)

Effect of Silver Nanoparticles on Tropical Freshwater and Marine Microalgae

Exopolysaccharides directed embellishment of diatoms triggered on plastics and other marine litter

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