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<p>Aligned with the Green Deal strategy to reduce the impacts of climate change on the agri-food sector, this study assessed the potential of a commercial biostimulant based on <i>Ascophyllum nodosum</i> extract to improve olive tolerance to drought. Potted plants of <i>Olea europaea</i> (cultivars Arbequina and Galega) were pre-treated with the extract or water. One group was maintained at 100% field capacity and another under water-deficit (50% field capacity) for 69&#xa0;days. Soil and leaf C and N contents, leaf dry mass, lipid peroxidation, membrane stability, H<sub>2</sub>O<sub>2</sub> content, fatty acid composition, antioxidant enzymes and metabolites, and the expression of genes related to plant defence processes were quantified. Drought in plants not treated with the biostimulant decreased C and N availability in soil and leaves, reduced leaf biomass, and induced oxidative stress, being Arbequina more susceptible, with lipid peroxidation and H<sub>2</sub>O<sub>2</sub> accumulation. The extract alleviated the stress impact of both cultivars. In Arbequina, it strengthened the antioxidant system, with accumulation of verbascoside and upregulation of the flavonoid biosynthetic pathway (<i>OeCHS</i>—chalcone synthase). In Galega, the extract limited excessive H<sub>2</sub>O<sub>2</sub> accumulation, activated defence mechanisms including SOD and APX, increased the levels of metabolites (methoxyoleuropein and luteolin 7-<i>O</i>-glucoside), and readjusted the lipid profile to improve membrane fluidity (higher UFA/SFA and expression of <i>OeFAD9</i>—flavin adenine dinucleotide desaturase). Additionally, <i>A. nodosum</i> increased leaf N availability, contributing to higher leaf biomass production. Our results confirm the beneficial effects of this extract on olives to cope with drought and clarify the mode of action of this biostimulant, which varies with the cultivar.</p>

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Ascophyllum nodosum extract modulates the antioxidant response of olive cultivars to water deficit stress

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月6日

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  • Maria Celeste Dias,
  • Rui Figueiras,
  • Marta Sousa,
  • Diana C. G. A. Pinto,
  • Artur M. S. Silva,
  • Sónia Silva,
  • Conceição Santos

摘要

Aligned with the Green Deal strategy to reduce the impacts of climate change on the agri-food sector, this study assessed the potential of a commercial biostimulant based on Ascophyllum nodosum extract to improve olive tolerance to drought. Potted plants of Olea europaea (cultivars Arbequina and Galega) were pre-treated with the extract or water. One group was maintained at 100% field capacity and another under water-deficit (50% field capacity) for 69 days. Soil and leaf C and N contents, leaf dry mass, lipid peroxidation, membrane stability, H2O2 content, fatty acid composition, antioxidant enzymes and metabolites, and the expression of genes related to plant defence processes were quantified. Drought in plants not treated with the biostimulant decreased C and N availability in soil and leaves, reduced leaf biomass, and induced oxidative stress, being Arbequina more susceptible, with lipid peroxidation and H2O2 accumulation. The extract alleviated the stress impact of both cultivars. In Arbequina, it strengthened the antioxidant system, with accumulation of verbascoside and upregulation of the flavonoid biosynthetic pathway (OeCHS—chalcone synthase). In Galega, the extract limited excessive H2O2 accumulation, activated defence mechanisms including SOD and APX, increased the levels of metabolites (methoxyoleuropein and luteolin 7-O-glucoside), and readjusted the lipid profile to improve membrane fluidity (higher UFA/SFA and expression of OeFAD9—flavin adenine dinucleotide desaturase). Additionally, A. nodosum increased leaf N availability, contributing to higher leaf biomass production. Our results confirm the beneficial effects of this extract on olives to cope with drought and clarify the mode of action of this biostimulant, which varies with the cultivar.