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<p>Water scarcity is a major challenge impacting global food security and therefore technologies for mitigating the negative impact on crop production are critical. This study investigated the effects of two seaweed extracts, <i>Sargassum</i> spp. (OJA1) and <i>Ascophyllum nodosum</i> (AN), on the bacterial microbiome profile and physiological performance of <i>Capsicum annuum</i> L. under water stress conditions. Seaweed extracts were applied as foliar sprays to plants prior to the&#xa0;introduction of water stress (25% field capacity for one week). Physiological parameters including chlorophyll content, stomatal conductance, and photosynthetic efficiency were measured. Rhizosphere and endosphere samples were subjected to 16S rRNA amplicon sequencing. Plants treated with OJA1 and AN showed a 200% and 138% increase in root weight and a 86% and 51% increase in shoot weight, respectively, compared to Control plants. Chlorophyll content and stomatal conductance were also significantly higher in seaweed-extract-treated plants. Metataxonomic analysis revealed distinct shifts in bacterial communities in both the rhizosphere and endosphere of treated plants. Dominant bacterial families, for example Streptomycetaceae and Rhizobiaceae, were more abundant in seaweed-treated plants. Notably, the OJA1 treatment led to a&#xa0;higher relative abundances of putative beneficial genera such as <i>Streptomyces</i> and <i>Allorhizobium</i>. This study provides evidence that seaweed biostimulants could augment plant resilience by modulating both plant physiology and the plant-associated microbiome.</p>

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Capsicum annuum L. plants treated with seaweed extracts (Sargassum spp. and Ascophyllum nodosum) show changes in the root and rhizosphere bacterial microbiome and improved performance under drought conditions

  • 期刊论文

  • 发表日期：

    2025年11月3日

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  • Omar Ali,
  • Adesh Ramsubhag,
  • Stephen D. B. Ramnarine Jr.,
  • Aidan D. Farrell,
  • Jayaraj Jayaraman

摘要

Water scarcity is a major challenge impacting global food security and therefore technologies for mitigating the negative impact on crop production are critical. This study investigated the effects of two seaweed extracts, Sargassum spp. (OJA1) and Ascophyllum nodosum (AN), on the bacterial microbiome profile and physiological performance of Capsicum annuum L. under water stress conditions. Seaweed extracts were applied as foliar sprays to plants prior to the introduction of water stress (25% field capacity for one week). Physiological parameters including chlorophyll content, stomatal conductance, and photosynthetic efficiency were measured. Rhizosphere and endosphere samples were subjected to 16S rRNA amplicon sequencing. Plants treated with OJA1 and AN showed a 200% and 138% increase in root weight and a 86% and 51% increase in shoot weight, respectively, compared to Control plants. Chlorophyll content and stomatal conductance were also significantly higher in seaweed-extract-treated plants. Metataxonomic analysis revealed distinct shifts in bacterial communities in both the rhizosphere and endosphere of treated plants. Dominant bacterial families, for example Streptomycetaceae and Rhizobiaceae, were more abundant in seaweed-treated plants. Notably, the OJA1 treatment led to a higher relative abundances of putative beneficial genera such as Streptomyces and Allorhizobium. This study provides evidence that seaweed biostimulants could augment plant resilience by modulating both plant physiology and the plant-associated microbiome.