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<p>Aqueous algal extracts (AAE) have been established as an environmentally sustainable practice for stimulating plant resilience against environmental stressors, including drought stress. The biostimulatory potential of aqueous extracts of the brown alga <i>Sargassum muticum</i> (Yendo) Fensholt was investigated in this study on seed germination and early seedling growth of pearl millet (<i>Pennisetum glaucum</i> L.) grown under a water deficit of -1.03 MPa induced by 30% polyethylene glycol (PEG 6000). The results showed that water deficit inhibited seed reserve mobilization and significantly reduced seed germination parameters, especially final germination percentage (FGP), velocity index (VI), and also reduced the seedling development. The seed treatment with 8% AAE (PEG + AAE) significantly counteracted the negative consequences of water scarcity on protein reserves mobilization in the embryo and improved germination traits such as FGP (25%), VI (26%), and lowered the time to reach 50% of germination (T<sub>50</sub>) by 15% as compared to PEG stressed seedlings. The PEG + AAE treatments reduced water scarcity-enhanced oxidative stress, including hydrogen peroxide (H<sub>2</sub>O<sub>2</sub>), malondialdehyde (MDA) content, and electrolyte leakage (EL) levels by up 29%, 65%, and 24%, respectively, when compared with PEG. Such biostimulative improvements were correlated to the ameliorative effect of PEG + AAE application on the enzyme activities, including catalase (CAT), superoxide dismutase (SOD), and guaiacol peroxidase (GPX), with increment percentages of 72%, 95%, and 22%, respectively, compared to PEG. Overall, these findings suggest that 8% AAE application is a potential solution to improve pearl millet seed emergence and seedling development under water deficit stress conditions.</p>

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Sargassum muticum extracts increase pearl millet (Pennisetum glaucum L.) germination and seedling growth under water deficit stress

  • 期刊论文

  • 发表日期：

    2026年1月6日

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  • Hamid Msaad,
  • Soukaina Lahmaoui,
  • Omar Farssi,
  • Nadia Lamsaadi,
  • Ahmed El Moukhtari,
  • Cherki Ghoulam,
  • Walid Zorrig,
  • Mohamed Farissi

摘要

Aqueous algal extracts (AAE) have been established as an environmentally sustainable practice for stimulating plant resilience against environmental stressors, including drought stress. The biostimulatory potential of aqueous extracts of the brown alga Sargassum muticum (Yendo) Fensholt was investigated in this study on seed germination and early seedling growth of pearl millet (Pennisetum glaucum L.) grown under a water deficit of -1.03 MPa induced by 30% polyethylene glycol (PEG 6000). The results showed that water deficit inhibited seed reserve mobilization and significantly reduced seed germination parameters, especially final germination percentage (FGP), velocity index (VI), and also reduced the seedling development. The seed treatment with 8% AAE (PEG + AAE) significantly counteracted the negative consequences of water scarcity on protein reserves mobilization in the embryo and improved germination traits such as FGP (25%), VI (26%), and lowered the time to reach 50% of germination (T50) by 15% as compared to PEG stressed seedlings. The PEG + AAE treatments reduced water scarcity-enhanced oxidative stress, including hydrogen peroxide (H2O2), malondialdehyde (MDA) content, and electrolyte leakage (EL) levels by up 29%, 65%, and 24%, respectively, when compared with PEG. Such biostimulative improvements were correlated to the ameliorative effect of PEG + AAE application on the enzyme activities, including catalase (CAT), superoxide dismutase (SOD), and guaiacol peroxidase (GPX), with increment percentages of 72%, 95%, and 22%, respectively, compared to PEG. Overall, these findings suggest that 8% AAE application is a potential solution to improve pearl millet seed emergence and seedling development under water deficit stress conditions.