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<p>Protein hydrolysates (PHs) produced from plants improve plant growth under both normal and stressful conditions. This study was done to evaluate the antioxidant activities of PHs derived from different olive oil extraction waste materials. The antioxidant activity of olive PHs, which were produced using the commercial enzyme Alcalase, was evaluated using three different assays measuring the ability to scavenge free radicals of 1,1-diphenyl-2-picrylhydrazyl (DPPH) and hydroxyl and lipid peroxidation inhibition. The inhibition percentage of seed, pomace, and leaf PH was 58.7, 52.3, and 20.0%, respectively, as determined by the DPPH radical scavenging experiment. The seed, pomace, and leaf PH demonstrated hydroxyl radical scavenging with 47.6, 43.6, and 26.1% inhibition, respectively. The samples that produced the highest lipid peroxidation inhibition capacity (87.8%) were the seeds. In comparison to other hydrolysates, seed PH had the greatest antioxidant capacity and was chosen for the second experiment. To this end, a pot experiment was carried out to determine physio-biochemical attributes in foliar or root PH-treated (0.15% (v/v)) strawberry (<i>Fragaria × ananassa</i> Duch.) plants under water-stress conditions. Under water stress conditions, PH modulated strawberry leaf physio-biochemical traits, by reducing the concentrations of malondialdehyde (14.0%) and by favoring the accumulation of ascorbic acid (36.6%). Plant treatment with 0.15% (v/v) PH decreased ionic leakage (26.6%), and plants showed higher relative water content (17.7%) than non-treated plants. The obtained results showed that the olive seed PH can be effectively utilized to reduce damages caused by drought stress.</p>

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Protein hydrolysate from olive oil waste as an effective biostimulant to enhance strawberry resilience against water stress

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年8月5日

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  • Maryam Janghorban,
  • Mahdiyeh Gholami,
  • Azar Shahpiri

摘要

Protein hydrolysates (PHs) produced from plants improve plant growth under both normal and stressful conditions. This study was done to evaluate the antioxidant activities of PHs derived from different olive oil extraction waste materials. The antioxidant activity of olive PHs, which were produced using the commercial enzyme Alcalase, was evaluated using three different assays measuring the ability to scavenge free radicals of 1,1-diphenyl-2-picrylhydrazyl (DPPH) and hydroxyl and lipid peroxidation inhibition. The inhibition percentage of seed, pomace, and leaf PH was 58.7, 52.3, and 20.0%, respectively, as determined by the DPPH radical scavenging experiment. The seed, pomace, and leaf PH demonstrated hydroxyl radical scavenging with 47.6, 43.6, and 26.1% inhibition, respectively. The samples that produced the highest lipid peroxidation inhibition capacity (87.8%) were the seeds. In comparison to other hydrolysates, seed PH had the greatest antioxidant capacity and was chosen for the second experiment. To this end, a pot experiment was carried out to determine physio-biochemical attributes in foliar or root PH-treated (0.15% (v/v)) strawberry (Fragaria × ananassa Duch.) plants under water-stress conditions. Under water stress conditions, PH modulated strawberry leaf physio-biochemical traits, by reducing the concentrations of malondialdehyde (14.0%) and by favoring the accumulation of ascorbic acid (36.6%). Plant treatment with 0.15% (v/v) PH decreased ionic leakage (26.6%), and plants showed higher relative water content (17.7%) than non-treated plants. The obtained results showed that the olive seed PH can be effectively utilized to reduce damages caused by drought stress.