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<p>Germination represents a pivotal phase in crop development, often constrained by biological and environmental stressors that hinder successful plant stand formation. Both California Wonder pepper (<i>Capsicum annuum</i>) and tomato (<i>Solanum lycopersicum</i>) often exhibit slow, asynchronous germination and reduced seedling establishment under non-stressful conditions, which limits early crop uniformity. Seed priming is a pre-planting technique that enhances seed physiology, leading to accelerated and synchronized germination, improved seedling vigor, and enhanced stress tolerance. This research evaluated the efficacy of leaf extracts from peppermint, thyme, rosemary, and savory applied individually as seed priming treatments for pepper and tomato under controlled greenhouse pot conditions. <i>Solanum lycopersicum</i> cv. SV3725 was selected because it is a widely grown commercial variety in the study region (southern Iran), known for its moderate tolerance to fungal pathogens and responsiveness to biostimulant treatments based on preliminary trials (data not shown). Seeds were soaked in 10% or 20% hydroethanolic extracts of the four herbs, or in 2% solutions of the fungicides Tebuconazole, Rovral-TS, or Captan. A completely randomized design with four replicates and 20 seeds per pot was employed. Liquid chromatography–mass spectrometry (LC-MS) analysis revealed that the dominant bioactive constituents across the four herbal extracts were rosmarinic acid, caryophyllene oxide, cinnamic acid, caffeic acid, limonene, and β-caryophyllene. The results indicated that seed priming with 10% savory leaf extract significantly improved germination percentage, seedling establishment, and seed vigor index in both pepper and tomato compared to the control (<i>p</i> ≤ 0.05). In pepper, 10% savory extract increased germination to 76.7%, seedling establishment to 58.3%, and seed vigor index to 1233. In tomato, the same treatment enhanced germination to 86.7%, seedling establishment to 100%, and seed vigor index to 2193, performing comparably to the synthetic fungicide Tebuconazole (93.3% germination).</p>

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Hydroethanolic extracts of four Lamiaceae species boost seed germination and growth of pepper and tomato: an LC-MS metabolomic study

  • 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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  • Ali Salehi Sardoei,
  • Mehrdad Babarabie,
  • Parvin Zolfaghary,
  • Zahra Hasanpour,
  • Mohammad Reza Asgharipour

摘要

Germination represents a pivotal phase in crop development, often constrained by biological and environmental stressors that hinder successful plant stand formation. Both California Wonder pepper (Capsicum annuum) and tomato (Solanum lycopersicum) often exhibit slow, asynchronous germination and reduced seedling establishment under non-stressful conditions, which limits early crop uniformity. Seed priming is a pre-planting technique that enhances seed physiology, leading to accelerated and synchronized germination, improved seedling vigor, and enhanced stress tolerance. This research evaluated the efficacy of leaf extracts from peppermint, thyme, rosemary, and savory applied individually as seed priming treatments for pepper and tomato under controlled greenhouse pot conditions. Solanum lycopersicum cv. SV3725 was selected because it is a widely grown commercial variety in the study region (southern Iran), known for its moderate tolerance to fungal pathogens and responsiveness to biostimulant treatments based on preliminary trials (data not shown). Seeds were soaked in 10% or 20% hydroethanolic extracts of the four herbs, or in 2% solutions of the fungicides Tebuconazole, Rovral-TS, or Captan. A completely randomized design with four replicates and 20 seeds per pot was employed. Liquid chromatography–mass spectrometry (LC-MS) analysis revealed that the dominant bioactive constituents across the four herbal extracts were rosmarinic acid, caryophyllene oxide, cinnamic acid, caffeic acid, limonene, and β-caryophyllene. The results indicated that seed priming with 10% savory leaf extract significantly improved germination percentage, seedling establishment, and seed vigor index in both pepper and tomato compared to the control (p ≤ 0.05). In pepper, 10% savory extract increased germination to 76.7%, seedling establishment to 58.3%, and seed vigor index to 1233. In tomato, the same treatment enhanced germination to 86.7%, seedling establishment to 100%, and seed vigor index to 2193, performing comparably to the synthetic fungicide Tebuconazole (93.3% germination).