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<p> Purpose: Drought poses a serious challenge to the sustainability of fruit trees in the Mediterranean region. It is also a major abiotic stress affecting the rhizosphere and associated microbial communities. This stress reduces microbial abundance, structure, and activity, including enzyme production and nutrient cycling in the rhizosphere. However, the addition of beneficial microorganisms such as arbuscular mycorrhizal fungi (AMF) and plant growth-promoting rhizobacteria (PGPR) to the olive rhizosphere is not sufficiently known. In this regard, this study aimed to investigate the effects of applying AMF alone and/or in combination with PGPR on enhancing growth and enzymatic activity in the rhizosphere of two olive varieties (Moroccan picholine and arbequina). Methods: The experiment was conducted under controlled greenhouse conditions using two olive cultivars (Moroccan picholine and Arbequina). Plants were subjected to four treatments: control (no inoculation), AMF, PGPR, and AMF + PGPR. Growth parameters and rhizosphere enzymatic activities (phosphatase, dehydrogenase, and peroxidase) were measured under both well-watered (WW) and drought stress (DS) regimes to assess the contribution of beneficial microorganisms to plant performance and soil functional activity. Results: The results obtained under controlled conditions revealed that DS adversely affected growth and rhizosphere enzyme activity. In addition, the AMF + PGPR boosted the activities of phosphatase (by 117, 221%), dehydrogenase (by 147 and 89%), and peroxidase (by 71 and 85%) for Moroccan picholine and arbequina varieties, respectively, under DS. Conclusion: In summary, the addition of beneficial microorganisms confers crucial enzymatic activity to the olive rhizosphere under conditions of severe water stress, likely improving nutrient availability essential for olive tree growth and productivity.</p>

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Beneficial Microorganisms’ Effects on Root Growth and Rhizosphere Enzyme Activity of the Olive Tree Subjected To Water Stress

  • 期刊论文

  • 发表日期：

    2025年12月20日

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  • Naira Sbbar,
  • Soufiane Lahbouki,
  • Abdelhamid Aouabe,
  • Salah Er-raki,
  • Allal Douira,
  • Ahmed El Bakkali,
  • Abderrahim Boutasknit,
  • Cherkaoui El Modafar,
  • Abdelilah Meddich

摘要

Purpose: Drought poses a serious challenge to the sustainability of fruit trees in the Mediterranean region. It is also a major abiotic stress affecting the rhizosphere and associated microbial communities. This stress reduces microbial abundance, structure, and activity, including enzyme production and nutrient cycling in the rhizosphere. However, the addition of beneficial microorganisms such as arbuscular mycorrhizal fungi (AMF) and plant growth-promoting rhizobacteria (PGPR) to the olive rhizosphere is not sufficiently known. In this regard, this study aimed to investigate the effects of applying AMF alone and/or in combination with PGPR on enhancing growth and enzymatic activity in the rhizosphere of two olive varieties (Moroccan picholine and arbequina). Methods: The experiment was conducted under controlled greenhouse conditions using two olive cultivars (Moroccan picholine and Arbequina). Plants were subjected to four treatments: control (no inoculation), AMF, PGPR, and AMF + PGPR. Growth parameters and rhizosphere enzymatic activities (phosphatase, dehydrogenase, and peroxidase) were measured under both well-watered (WW) and drought stress (DS) regimes to assess the contribution of beneficial microorganisms to plant performance and soil functional activity. Results: The results obtained under controlled conditions revealed that DS adversely affected growth and rhizosphere enzyme activity. In addition, the AMF + PGPR boosted the activities of phosphatase (by 117, 221%), dehydrogenase (by 147 and 89%), and peroxidase (by 71 and 85%) for Moroccan picholine and arbequina varieties, respectively, under DS. Conclusion: In summary, the addition of beneficial microorganisms confers crucial enzymatic activity to the olive rhizosphere under conditions of severe water stress, likely improving nutrient availability essential for olive tree growth and productivity.