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<p>In Mediterranean regions, olive trees hold significant economic and environmental value. However, irregular rainfall and prolonged periods of drought severely compromise their physiological and nutritional recovery. In this context, the present study aims to evaluate the role of beneficial microorganisms—plant growth-promoting rhizobacteria (PGPR), arbuscular mycorrhizal fungi (AMF), and their combination (PGPR+AMF)— in enhancing drought tolerance and recovery following gradual rehydration in two olive cultivars, namely, Moroccan Picholine and Arbequina.&#xa0;A 50-day drought stress trial was conducted in a controlled greenhouse, followed by a progressive rehydration phase. The two olive cultivars were subjected to four treatments: control (no inoculation), PGPR, AMF, and PGPR+AMF. Growth attributes, physiological parameters, and nutrient uptake were measured before and after the three rehydration phases to assess the effect of each treatment on plant resilience.The results revealed that stopping irrigation for 50 days significantly reduced plant growth, biomass, physiology, and nutritional uptake. However, inoculation with PGPR, AMF, and especially PGPR+AMF mitigated these negative effects, promoting faster recovery after rehydration through improved growth, stomatal conductance, and nutrient uptake. Moreover, Moroccan Picholine exhibited greater drought tolerance than did Arbequina, making it a promising cultivar for arid and semiarid environments.This case study highlights the beneficial effects of PGPR, AMF, and their combination in improving the resistance of olive trees to periods of drought. These preliminary results provide a valuable basis for future field research in arid conditions.</p>

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Role of Arbuscular Mycorrhizal Fungi Associated with PGPR in the Recovery of the Physiological and Nutritional Status of Olive Trees Under Prolonged Drought Stress

  • 期刊论文

  • 发表日期：

    2025年11月6日

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

摘要

In Mediterranean regions, olive trees hold significant economic and environmental value. However, irregular rainfall and prolonged periods of drought severely compromise their physiological and nutritional recovery. In this context, the present study aims to evaluate the role of beneficial microorganisms—plant growth-promoting rhizobacteria (PGPR), arbuscular mycorrhizal fungi (AMF), and their combination (PGPR+AMF)— in enhancing drought tolerance and recovery following gradual rehydration in two olive cultivars, namely, Moroccan Picholine and Arbequina. A 50-day drought stress trial was conducted in a controlled greenhouse, followed by a progressive rehydration phase. The two olive cultivars were subjected to four treatments: control (no inoculation), PGPR, AMF, and PGPR+AMF. Growth attributes, physiological parameters, and nutrient uptake were measured before and after the three rehydration phases to assess the effect of each treatment on plant resilience.The results revealed that stopping irrigation for 50 days significantly reduced plant growth, biomass, physiology, and nutritional uptake. However, inoculation with PGPR, AMF, and especially PGPR+AMF mitigated these negative effects, promoting faster recovery after rehydration through improved growth, stomatal conductance, and nutrient uptake. Moreover, Moroccan Picholine exhibited greater drought tolerance than did Arbequina, making it a promising cultivar for arid and semiarid environments.This case study highlights the beneficial effects of PGPR, AMF, and their combination in improving the resistance of olive trees to periods of drought. These preliminary results provide a valuable basis for future field research in arid conditions.