Salt variation induces oxidative stress response in aquatic macrophytes: The case of the Eurasian water-milfoil Myriophyllum spicatum L. (Saxifragales: Haloragaceae). (5th July 2020)

• Record Type: Journal Article
• Authors: Gil, Lorenzo; Capó, Xavier; Tejada, Silvia; Mateu-Vicens, Guillem; Ferriol, Pere; Pinya, Samuel; Sureda, Antoni
• Is Part Of: Estuarine, coastal and shelf science. Volume 239(2020)
• Publication Date: 2020-07-05
• Subjects: Myriophyllum spicatum -- Conductivity -- Natura 2000 -- Oxidative stress -- Biomarkers -- Balearic islands; Estuarine oceanography -- Periodicals; Coasts -- Periodicals; Estuarine biology -- Periodicals; Seashore biology -- Periodicals; Coasts; Estuarine biology; Estuarine oceanography; Seashore biology; Periodicals; 551.461805
• DOI: 10.1016/j.ecss.2020.106756
• Languages: English
• ISSNs: 0272-7714

Abstract

Abstract: Wetlands are very fragile systems and susceptible to being affected by human activity. S'Albufera de Mallorca Natural Park is the main wetland in Mallorca Island (Spain), and undergoes a salinization process derived from the overexploitation of adjacent aquifers, which favors marine intrusion. The objective was to evaluate the effects of salinity changes in a channel in s'Albufera de Mallorca through the analysis of biomarkers of oxidative stress in the submerged macrophyte Myriophyllum spicatum . Six different points were analysed along a channel characterized by different salinity values, ranging from ~2 to ~11. The % of macrophyte coverage in the studied stations followed an inverse salinity pattern with greater coverage in areas of low salinity and minimal coverage in those with higher saline concentration. The photosynthetic pigments index (D430/D665), determined in M. spicatum leaves, was significantly higher at the stations most affected by salinity. All antioxidant enzyme activities – catalase, superoxide dismutase, glutathione peroxidase and glutathione reductase – followed a similar pattern of response with an increase in activity as salinity increases. Similarly, the levels of malondialdehyde, as marker of lipid peroxidation, were also increased the stations with the highest salinity. In conclusion, marine water intrusion causes an increase in the salinity of inland waters in s'Albufera de Mallorca, which is evidenced by the increase in the antioxidant enzyme activities and oxidative damage. Graphical abstract: Image 1 Highlights: Wetlands are very sensitive systems of being altered by human activity. S'Albufera de Mallorca Natural Park is affected by the salinization process. The macrophyte Myriophyllum spicatum responds to salinity with increased antioxidant defences. High salinity induces oxidative damage in M. spicatum .