Oxidative stress tolerance in intertidal red seaweed Hypnea musciformis (Wulfen) in relation to environmental components

Abstract

Oxidative stress parameters in relation to temperature and other factors have been analysed in Hypnea musciformis, the red seaweed from Anjuna beach, Goa, with an aim to understand its susceptibility to the changing seasons. The results indicate that elevated temperature, sunshine and dessication during peak summer in May enhanced the activity of lipid peroxide, hydrogen peroxide and antioxidants such as catalase, glutathione and ascorbic acid. Statistical tests using multivariate analysis of variance and correlation analysis showed that oxidative stress and antioxidants maintain significant relation with temperature, salinity, sunshine and pH at an individual or interactive level. The dissolved nitrates, phosphates and biological oxygen demand in ambient waters and the trace metals in seaweeds maintained sufficiently low values to provide any indication that could exert contaminant oxidative stress responses. The present field studies suggest that elevated antioxidant content in H. musciformis offer sufficient relief to sustain against harsh environmental stresses for its colonization in the rocky intertidal zone.

Bioactivity of Ellagic Acid and Velutin: Two Phenolic Compounds Isolated from Marine Algae

“…Marine algae are a rich source of bioactive secondary metabolites, including phenols and polyphenols (Andrade et al, 2013;Maharana et al, 2015;Fernando et al, 2016). In the present study, brown macroalgae had the highest antioxidant activity as described by Sameeh et al (2016) and Tenorio-Rodriguez et al (2017).…”

Antioxidant screening and phenolic content of ethanol extracts of selected Baja California Peninsula macroalgae

“…Antioxidant activity, an important property of bioactive algal compounds, has been ascribed to their reactive oxygen species scavenging ability, quenching singlet oxygen, reducing power, and chelating ability (Andrade et al 2013;Maharana et al 2015). The many antioxidant components in crude extracts of macroalgae make individual measurements different of each antioxidant.…”

“…Phlorotannins in brown macroalgae are strong chelators of heavy metals, responsible for the chelating ability in several macroalgae: Turbinaria conoides (Devi et al 2011), D ictyota dichotoma (Parthiban et al 2013), Eisenia bicyclis (Machu et al 2015), Cystoseira tamariscifolia , among others (Maharana et al 2015;VizettoDuarte et al 2016). In our study, E. arborea, P. concrecens, and C. osmundacea had the higher values, similar to those reported by Kelman et al (2012) for Turbinaria ornata (10.27 and 7.50 lM FeSO 4 lg -1 ).…”

“…Red (Rhodophyta), green (Chlorophyta), and brown (Phaeophyta) macroalgae offer a wide variety of natural compounds with interesting properties as natural antioxidants (Andrade et al 2013;Osuna-Ruiz et al 2016). Macroalgae have antioxidant systems to counteract environmental stresses, and produce bioactive compounds, including polyphenols, alkaloids, terpenes, phycocyanins, carotenoids, and various enzymes (Maharana et al 2015). The polyphenols from macroalgae are more potent that their analogues from terrestrial plants (Nagayama et al 2002), and possess strong antioxidant activity based on up to eight interconnected phenol rings (Fernando et al 2016).…”

Fucoid Macroalgae Have Distinct Physiological Mechanisms to Face Emersion and Submersion Periods in Their Southern Limit of Distribution

“…Thus, efforts need to be made to prevent future adaptations and/or shifts in the distribution of intertidal living beings. Up to date, the scientific community has been dedicated to unraveling the response of individual macroalgae species living in the intertidal and, in most studies, under controlled conditions [3,[10][11][12]. However, research should be conducted under field conditions, i.e., a more realistic scenario, to better understand the physiological responses of macroalgae that live at distinct intertidal levels to the above-mentioned environmental fluctuations to unravel the adaptation mechanisms that these species employ to deal with the ever-changing conditions that they are subjected to.…”