Antioxidant response to salinity stress in freshwater and marine Bangia (Bangiales, Rhodophyta)

A new filamentous marine red alga, Kuwaitiella rubra gen. et sp. nov. (Bangiales, Rhodophyta), is described from Kuwait in the north-western Arabian Gulf (also referred to as the Persian Gulf). It was found on a submerged fishing line. The intensively red upright thallus of up to 1 cm in length consists of cells containing a single stellate plastid. The thallus is initially uniseriate but becomes biseriate in its distal part upon transformation into globular reproductive cells, possibly archaeospores. The biseriate fertile part is the only morphological difference from other filamentous species of the Bangiales, in which this region is parenchymatous. In culture, bipolar asymmetric germination of the spores of Kuwaitiella led to a new generation of identical erect thalli, fixed to the substratum by colourless rhizoids. According to phylogenetic analyses of partial small subunit nuclear ribosomal DNA (18S) and of the plastid-encoded ribulose-1,-5-bisphosphate carboxylase/oxygenase large subunit (rbcL), the new species forms an additional lineage of the Bangiales, genetic similarity with other taxa being limited (maximum 91% in SSU and 90% in rbcL). It was no clear member of any known lineage of the Bangiales but was weakly associated with the filamentous species Minerva and Dione from New Zealand. In a SSU phylogeny, it formed a basal branch in the Bangiales and clustered with M. aenigmata and D. arcuata as sister clade to all other species of the order. In a rbcL phylogeny, it was part of a large polytomy of lineages, its closest relative being D. arcuata. Kuwaitiella forms the 8 th lineage of filamentous Bangiales detected so far.

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“…2011; Wang et al . 2019). K. rubra thus appears to share its probable stress‐tolerance with many other members of the order.…”

Section: Discussionmentioning

confidence: 99%

Kuwaitiella rubra gen. et sp. nov. (Bangiales, Rhodophyta), a new filamentous genus and species from the north‐western Indian Ocean

Hasan

Küpper

et al. 2022

Phycological Research

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“…[Colour figure can be viewed at wileyonlinelibrary.com] PHYSIOLOGICAL EFFICIENCY OF PALISADA UNDER STRESS microhabitats. In general, seaweeds that are exposed to wide fluctuations in stressful abiotic factors, such as UV radiation, tidal fluctuations, and exposure to air (desiccation), have developed efficient enzymatic or non-enzymatic mechanisms of antioxidant defense (Coll en and Davison 1999a,b, Vasconcelos et al 2019, Wang et al 2019, Yu et al 2020, to counteract the damage caused by oxidative stress. Pirian et al (2017) studied the seaweeds from the Persian Gulf and found Palisada perforata as one of the most promising species due to its combined antidiabetic and antioxidant properties.…”

Section: Discussionmentioning

confidence: 99%

“…2013, Wang et al. 2019). Independent studies investigating algal responses to fluctuating environmental conditions showed alterations in photosynthetic performance (Fv/Fm), cellular morphology, and ontogeny (e.g., Abe et al.…”

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confidence: 99%

“…Prolonged desiccation might cause a decrease in the photosynthetic rate, and simultaneously interrupt the electron flow between PSII and PSI (Heber et al 2010, Gao et al 2011, Papathanasiou et al 2020. Additionally, fluctuating and dynamic environmental conditions in the intertidal zone trigger the accumulation of reactive oxygen species (ROS; Coll en and Davison 1999a,b, Kumar et al 2010, Wang et al 2019, which can lead to oxidative stress if not buffered.…”

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confidence: 99%

“…Some studies have reported ROS induction and activation of the antioxidant system in seaweeds in response to desiccation (Coll en and Davison 1999a, b, Sampath-Wiley et al 2008, Kumar et al 2011, L opez-Cristoffanini et al 2013, Wang et al 2019. Independent studies investigating algal responses to fluctuating environmental conditions showed alterations in photosynthetic performance (Fv/Fm), cellular morphology, and ontogeny (e.g., Abe et al 2001, Varela et al 2006, Contreras-Porcia et al 2011, Kumar et al 2011, Gao and Wang 2012, Gao et al 2013, Wang et al 2018, Terada et al 2020.…”

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confidence: 99%

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Environmental Stress Tolerance and Antioxidant Response of Palisadaperforata (Rhodophyta) from a Tropical Reef¹

Vasconcelos

Urrea-Victoria

et al. 2021

Journal of Phycology

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In this study, we analyzed the antioxidant activity and total phenolic content of the intertidal seaweed Palisada perforata collected from different reef microhabitats (sheltered site, tide pool, plateau, and exposed site) along the coast of Pernambuco (Brazil). Both parameters were compared with the same parameters of this species grown in the laboratory under two experiments simulating temperature, salinity, and desiccation conditions found in the reef. After both experiments (temperature x salinity and desiccation), the algal photosynthetic performance was measured through chlorophyll fluorescence parameters using a pulse–amplitude modulation fluorometer to test their stress response. Palisada perforata likely underwent stress by desiccation due to tidal fluctuations rather than to temperature or salinity changes. This conclusion agrees with our observations of the plateau site´s specimens, which were exposed to both air and UV radiation during low tides and exhibited higher antioxidant activity to avoid oxidative damage. However, despite the environmental stress, the antioxidant activity remained low, suggesting that photoinhibition is a crucial protection mechanism against oxidative damage.

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De novo transcriptome assembly and variable salinity induced differential biochemical and transcript responses in Kappaphycus alvarezii, a red carrageenophyte

2023

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Antioxidant response to salinity stress in freshwater and marine Bangia (Bangiales, Rhodophyta)

Cited by 12 publications

References 38 publications

Kuwaitiella rubra gen. et sp. nov. (Bangiales, Rhodophyta), a new filamentous genus and species from the north‐western Indian Ocean

Kuwaitiella rubra gen. et sp. nov. (Bangiales, Rhodophyta), a new filamentous genus and species from the north‐western Indian Ocean

Environmental Stress Tolerance and Antioxidant Response of Palisadaperforata (Rhodophyta) from a Tropical Reef¹

De novo transcriptome assembly and variable salinity induced differential biochemical and transcript responses in Kappaphycus alvarezii, a red carrageenophyte

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Antioxidant response to salinity stress in freshwater and marine Bangia (Bangiales, Rhodophyta)

Cited by 12 publications

References 38 publications

Kuwaitiella rubra gen. et sp. nov. (Bangiales, Rhodophyta), a new filamentous genus and species from the north‐western Indian Ocean

Kuwaitiella rubra gen. et sp. nov. (Bangiales, Rhodophyta), a new filamentous genus and species from the north‐western Indian Ocean

Environmental Stress Tolerance and Antioxidant Response of Palisadaperforata (Rhodophyta) from a Tropical Reef1

De novo transcriptome assembly and variable salinity induced differential biochemical and transcript responses in Kappaphycus alvarezii, a red carrageenophyte

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Environmental Stress Tolerance and Antioxidant Response of Palisadaperforata (Rhodophyta) from a Tropical Reef¹