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<p>Water scarcity is a&#xa0;major constraint in pomegranate (<i>Punica granatum</i>&#xa0;L.) cultivation. A&#xa0;new sustainable strategy to improve the tolerance of trees to water stress is needed. In this context, the present study performed an initial evaluation of a&#xa0;novel biostimulant, prepared by combining phenolic extract and lignin nanoparticles extracted from olive mill solid waste, applied on pomegranate trees subjected to deficit irrigation (ST), which was compared with control&#xa0;(C) and deficit irrigation without biostimulant (S) treatments. Various parameters were evaluated. In treated leaves, the biostimulant enhanced total chlorophyll content and decreased malondialdehyde and starch; however, there was no significant difference in total phenolic and flavonoid content. Treatment(ST) improved fruit weight and enriched soluble solids, phenols, flavonoids, and lycopene in juice. This study demonstrates the validity of using bioactive compounds with biostimulant action by recycling and valorizing bio-residues from the olive oil production chain.</p>

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Initial Assessment of a New Olive Mill Waste-Derived Biostimulant for Mitigating Water Stress in Pomegranate Trees

  • 期刊论文

  • 发表日期：

    2026年7月1日

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  • Darine Tlili,
  • Samia Abboud,
  • Sahar Ben Abdelwaheb,
  • Azhar Ouni,
  • Soumaya Dbara

摘要

Water scarcity is a major constraint in pomegranate (Punica granatum L.) cultivation. A new sustainable strategy to improve the tolerance of trees to water stress is needed. In this context, the present study performed an initial evaluation of a novel biostimulant, prepared by combining phenolic extract and lignin nanoparticles extracted from olive mill solid waste, applied on pomegranate trees subjected to deficit irrigation (ST), which was compared with control (C) and deficit irrigation without biostimulant (S) treatments. Various parameters were evaluated. In treated leaves, the biostimulant enhanced total chlorophyll content and decreased malondialdehyde and starch; however, there was no significant difference in total phenolic and flavonoid content. Treatment(ST) improved fruit weight and enriched soluble solids, phenols, flavonoids, and lycopene in juice. This study demonstrates the validity of using bioactive compounds with biostimulant action by recycling and valorizing bio-residues from the olive oil production chain.