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<p>This study aimed to isolate a soil microalgal strain and evaluate its effects on seed germination, growth and biochemical parameters of basil (<i>Ocimum basilicum</i> L.) under three watering conditions: well-watered (70% of water holding capacity (WHC)), water-deficit (35% WHC), and flooded (95% WHC). The microalgal isolate S16/8 (<i>Coelastrella</i> sp.) was identified through morphological and molecular characterization. The highest values for germination percentage (96%), daily seedling growth (32 N day<sup>−1</sup>), seedling growth rate (9.6 N day<sup>−1</sup>), mean germination time (53.1&#xa0;days), vigor index (6144%), root length (96&#xa0;mm), and shoot length (32&#xa0;mm) were achieved in variant where the isolate was applied along with its growth medium. Across all conditions, <i>Coelastrella</i> S16/8 positively influenced root and shoot length, as well as fresh and dry mass of six-week-old plants, with the strongest impact on stem length. Biochemical analyses revealed that <i>Coelastrella</i> S16/8 significantly reduced lipid peroxidation in drought-stressed plants, lowering it to nearly half of control values and 3.7 times lower under flooded conditions. Soluble protein content was highest in drought-stressed plants for both the control and <i>Coelastrella</i> S16/8-treated groups. Superoxide dismutase (SOD) activity was significantly elevated under flooded conditions, while glutathione (GSH) levels were notably higher in drought-stressed control plants and in <i>Coelastrella</i> S16/8-treated plants under flooding. No significant changes were observed in total protein (TP) content across all tested conditions and treatments.</p>

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Soil microalga Coelastrella sp. alleviates water stress in basil (Ocimum basilicum L.) plants

  • 期刊论文

  • 发表日期：

    2025年8月7日

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  • Dragana Stamenov,
  • Timea Hajnal Jafari,
  • Simonida Djurić,
  • Vladimira Žunić,
  • Biljana Kiprovski,
  • Milica Aćimović

摘要

This study aimed to isolate a soil microalgal strain and evaluate its effects on seed germination, growth and biochemical parameters of basil (Ocimum basilicum L.) under three watering conditions: well-watered (70% of water holding capacity (WHC)), water-deficit (35% WHC), and flooded (95% WHC). The microalgal isolate S16/8 (Coelastrella sp.) was identified through morphological and molecular characterization. The highest values for germination percentage (96%), daily seedling growth (32 N day−1), seedling growth rate (9.6 N day−1), mean germination time (53.1 days), vigor index (6144%), root length (96 mm), and shoot length (32 mm) were achieved in variant where the isolate was applied along with its growth medium. Across all conditions, Coelastrella S16/8 positively influenced root and shoot length, as well as fresh and dry mass of six-week-old plants, with the strongest impact on stem length. Biochemical analyses revealed that Coelastrella S16/8 significantly reduced lipid peroxidation in drought-stressed plants, lowering it to nearly half of control values and 3.7 times lower under flooded conditions. Soluble protein content was highest in drought-stressed plants for both the control and Coelastrella S16/8-treated groups. Superoxide dismutase (SOD) activity was significantly elevated under flooded conditions, while glutathione (GSH) levels were notably higher in drought-stressed control plants and in Coelastrella S16/8-treated plants under flooding. No significant changes were observed in total protein (TP) content across all tested conditions and treatments.