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<p>Microalgae are receiving increasing interest in modern agriculture for their potential to enhance natural plant processes without harming the environment. The objective of this study was to examine the potential utilization of&#xa0;<i>Haematococcus pluvialis</i> as a biostimulant for the seeds of <i>Origanum compactum</i> and <i>Origanum elongatum</i>. Four seed soaking treatments were employed, namely whole culture, intact cells, ultrasonically lysed cells and cell-free supernatants. Furthermore, the impact of the three growth phases of <i>H. pluvialis</i> (green, intermediate, and red) on its biostimulant efficacy was investigated. The intact cells of <i>H. pluvialis</i> yielded optimal outcomes, with an increase in the percentage of germinating seeds by 54.43% in <i>O. compactum</i> and 39.43% in <i>O. elongatum</i> compared to the control treatments. Moreover, the application of intact cells led to a substantial enhancement in the values of germination&#xa0;several&#xa0;parameters, including the germination index, mean daily germination, index of germination speed and germinative energy. The biostimulant effect of <i>H. pluvialis</i> was found to be growth stage-dependent, with the use of intact cells at the intermediate growth stage being the most optimal. The biochemical composition of the cells at this stage was found to be predominantly carbohydrates (52.98%), followed by proteins (23.4%) and carotenoids (12.8%). Correlation analysis revealed a strong positive correlation between carbohydrates and the biostimulant activity of <i>H. pluvialis</i>, suggesting that these compounds could represent a target for enhancing the biostimulant potential of this microalga.</p>

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Biostimulant effect of Haematococcus pluvialis on the germination of seeds from two Moroccan endemic plants: Origanum compactum and Origanum elongatum

  • 期刊论文

  • 发表日期：

    2025年2月10日

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  • Sanaa Ouzakar,
  • Nadia Skali Senhaji,
  • Jamal Abrini

摘要

Microalgae are receiving increasing interest in modern agriculture for their potential to enhance natural plant processes without harming the environment. The objective of this study was to examine the potential utilization of Haematococcus pluvialis as a biostimulant for the seeds of Origanum compactum and Origanum elongatum. Four seed soaking treatments were employed, namely whole culture, intact cells, ultrasonically lysed cells and cell-free supernatants. Furthermore, the impact of the three growth phases of H. pluvialis (green, intermediate, and red) on its biostimulant efficacy was investigated. The intact cells of H. pluvialis yielded optimal outcomes, with an increase in the percentage of germinating seeds by 54.43% in O. compactum and 39.43% in O. elongatum compared to the control treatments. Moreover, the application of intact cells led to a substantial enhancement in the values of germination several parameters, including the germination index, mean daily germination, index of germination speed and germinative energy. The biostimulant effect of H. pluvialis was found to be growth stage-dependent, with the use of intact cells at the intermediate growth stage being the most optimal. The biochemical composition of the cells at this stage was found to be predominantly carbohydrates (52.98%), followed by proteins (23.4%) and carotenoids (12.8%). Correlation analysis revealed a strong positive correlation between carbohydrates and the biostimulant activity of H. pluvialis, suggesting that these compounds could represent a target for enhancing the biostimulant potential of this microalga.