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<p>This study investigated seasonal fluctuations in the antioxidant system of the moss <i>Brittonodoxa subpinnata</i> (Sematophyllaceae) across two Brazilian phytogeographic domains: Atlantic rainforest and Cerrado. Key antioxidant enzyme activities, Superoxide dismutase (SOD), Catalase (CAT), Ascorbate peroxidase (APX), Glutathione reductase (GR), and non-enzymatic antioxidant concentration (ascorbate and glutathione), hydrogen peroxide, a reactive oxygen species (ROS), and malondialdehyde (MDA), a marker of lipid peroxidation, were quantified. Antioxidant activity increased markedly during the dry season, indicating physiological adjustments to drought. Unexpectedly, MDA concentrations were higher during the rainy season, suggesting that elevated temperature and solar radiation may also drive oxidative damage. Despite regional environmental differences, seasonal variation played a greater role in modulating redox responses. These findings contribute to our understanding of how tropical bryophytes physiologically adapt to seasonal disturbances and underscore their potential vulnerability to climate change.</p>

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Seasonal regulation of the antioxidant systems confers resilience in the moss Brittonodoxa subpinnata

  • 期刊论文

  • 发表日期：

    2025年9月23日

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  • Adriana dos Santos Lopes,
  • Cláudia Maria Furlan

摘要

This study investigated seasonal fluctuations in the antioxidant system of the moss Brittonodoxa subpinnata (Sematophyllaceae) across two Brazilian phytogeographic domains: Atlantic rainforest and Cerrado. Key antioxidant enzyme activities, Superoxide dismutase (SOD), Catalase (CAT), Ascorbate peroxidase (APX), Glutathione reductase (GR), and non-enzymatic antioxidant concentration (ascorbate and glutathione), hydrogen peroxide, a reactive oxygen species (ROS), and malondialdehyde (MDA), a marker of lipid peroxidation, were quantified. Antioxidant activity increased markedly during the dry season, indicating physiological adjustments to drought. Unexpectedly, MDA concentrations were higher during the rainy season, suggesting that elevated temperature and solar radiation may also drive oxidative damage. Despite regional environmental differences, seasonal variation played a greater role in modulating redox responses. These findings contribute to our understanding of how tropical bryophytes physiologically adapt to seasonal disturbances and underscore their potential vulnerability to climate change.