Biochemical leaf traits as indicators of tolerance potential in tree species from the Brazilian Atlantic Forest against oxidative environmental stressors

• Published in: The Science of the total environment 2017-01, Vol.575, p.406-417
• Main Authors: Brandão, Solange E., Bulbovas, Patricia, Lima, Marcos E.L., Domingos, Marisa
• Format: Article
• Language: English
• Subjects: Air pollutants; Antioxidants; Atlantic Forest; Brazil; Climatic stressors; Forests; Oxidative injury; Oxidative Stress; Pioneer/non-pioneer tree species; Plant Leaves - chemistry; Trees - physiology
• ISSN: 0048-9697; 1879-1026
• DOI: 10.1016/j.scitotenv.2016.10.006

The tolerance potential against the oxidative injury in native plants from forest ecosystems affected by environmental stressors depends on how efficiently they keep their pro-oxidant/antioxidant balance. Great variations in plant tolerance are expected, highlighting the higher relevance of measuring biochemical leaf trait indicators of oxidative injury in species with similar functions in the forest than in single species. The use of this functional approach seems very useful in the Brazilian Atlantic Forest because it still holds high plant diversity and was the focus of this study. We aimed at determining the tolerance potential of tree species from the Atlantic Forest remnants in SE Brazil against multiple oxidative environmental stressors. We assumed that pioneer tree species are more tolerant against oxidative stress than non-pioneer tree species and that their tolerance potential vary spatially in response to distinct combined effects of oxidative environmental stressors. The study was carried out in three Atlantic Forest remnants, which differ in physiognomy, species composition, climatic characteristics and air pollution exposure. Leaves of three pioneer and three non-pioneer species were collected from each forest remnant during wet (January 2015) and dry periods (June 2015), for analyses of non-enzymatic and enzymatic antioxidants and oxidative injury indicators. Both hypotheses were confirmed. The pioneer tree species displayed biochemical leaf traits (e.g. high levels of ascorbic acid, glutathione and carotenoids and lower lipid peroxidation) that indicate their higher potential tolerance against oxidative environmental stressors than non-pioneer species. The biochemical leaf traits of both successional groups of species varied between the forest remnants, in response to a linear combination of oxidative environmental stressors, from natural (relative humidity and temperature) and anthropogenic sources (ozone and nitrogen dioxide). [Display omitted] •We established the tolerance potential of trees from the Brazilian Atlantic Forest.•The functional approach was used to achieve a higher relevant evaluation.•Leaf antioxidants and oxidative injury were analyzed in pioneer/non-pioneer trees.•Pioneer trees were more tolerant against oxidative stress than non-pioneer species.•The biochemical leaf traits varied in response to combined environmental stressors.