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<p>This study evaluates the propagation potential of two caper subspecies native to Tunisia, <i>Capparis spinosa</i> ssp. <i>rupestris</i> (inerm caper) and <i>C. spinosa</i> ssp. <i>spinosa</i> (thorny caper), using conventional sowing and vegetative cuttings. The obtained results showed that germination rates vary significantly among subspecies and seed storage conditions. <i>C. spinosa</i> ssp. <i>rupestris</i> showed the highest germination rate (96.75%) with non-stored seeds, while <i>C. spinosa</i> ssp. <i>spinosa</i> exhibited poor germination rates not exceeding 7%. Stored seeds showed significant reduction in germination ability compared to non-stored seeds for both subspecies, declining by 90 and 82% for <i>C. spinosa</i> ssp. <i>rupestris</i> and <i>C. spinosa</i> ssp. <i>spinosa</i>, respectively. Vegetative propagation assays revealed that stem cutting regeneration rates were significantly influenced by subspecies, substrate, and indole-3-butyric acid (IBA) concentration. Without IBA, regeneration rates were low, ranging between 3 and 15% for inerm caper, and between 0.67 and 8.67% for thorny caper. The addition of IBA improved significantly the regeneration across all substrates. For <i>C. spinosa</i> ssp. <i>rupestris</i>, the highest regeneration rates were obtained with sand substrate at 4000&#xa0;ppm IBA (93%) and 5000&#xa0;ppm IBA (87%). While <i>C. spinosa</i> subsp. <i>spinosa</i> has been shown to be recalcitrant under most tested conditions, optimization experiments allowed to reach a regeneration rate of 63.33% with 4000&#xa0;ppm IBA in a sand substrate, and a second-highest result of 40% with 5000&#xa0;ppm IBA in a [1/3 sand + 2/3 peat] substrate mixture. The overall results revealed that both conventional seed propagation and vegetative cutting were highly successful in <i>C. spinosa</i> subsp. <i>rupestris</i>, achieving rates exceeding 90%. However, further investigations are needed to improve the propagation of <i>C. spinosa</i> subsp. <i>spinosa</i>, which remains recalcitrant to both techniques. </p>

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Optimizing the regeneration of two wild caper subspecies through sowing and clonal propagation techniques for commercial cultivation

  • 期刊论文

  • 发表日期：

    2025年5月17日

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  • Awatef Rhimi,
  • Neila Jellouli,
  • Leila Riahi,
  • Saloua Ouerghemmi,
  • Sameh Mnasri,
  • Sonia Hjaoujia,
  • Mohsen Trabelssi,
  • Mbarek Ben Naceur,
  • Mohamed Boussaid,
  • Chokri Messaoud

摘要

This study evaluates the propagation potential of two caper subspecies native to Tunisia, Capparis spinosa ssp. rupestris (inerm caper) and C. spinosa ssp. spinosa (thorny caper), using conventional sowing and vegetative cuttings. The obtained results showed that germination rates vary significantly among subspecies and seed storage conditions. C. spinosa ssp. rupestris showed the highest germination rate (96.75%) with non-stored seeds, while C. spinosa ssp. spinosa exhibited poor germination rates not exceeding 7%. Stored seeds showed significant reduction in germination ability compared to non-stored seeds for both subspecies, declining by 90 and 82% for C. spinosa ssp. rupestris and C. spinosa ssp. spinosa, respectively. Vegetative propagation assays revealed that stem cutting regeneration rates were significantly influenced by subspecies, substrate, and indole-3-butyric acid (IBA) concentration. Without IBA, regeneration rates were low, ranging between 3 and 15% for inerm caper, and between 0.67 and 8.67% for thorny caper. The addition of IBA improved significantly the regeneration across all substrates. For C. spinosa ssp. rupestris, the highest regeneration rates were obtained with sand substrate at 4000 ppm IBA (93%) and 5000 ppm IBA (87%). While C. spinosa subsp. spinosa has been shown to be recalcitrant under most tested conditions, optimization experiments allowed to reach a regeneration rate of 63.33% with 4000 ppm IBA in a sand substrate, and a second-highest result of 40% with 5000 ppm IBA in a [1/3 sand + 2/3 peat] substrate mixture. The overall results revealed that both conventional seed propagation and vegetative cutting were highly successful in C. spinosa subsp. rupestris, achieving rates exceeding 90%. However, further investigations are needed to improve the propagation of C. spinosa subsp. spinosa, which remains recalcitrant to both techniques.