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<p>Salinity is an abiotic stress that significantly reduces plant growth and the aesthetic value of ornamental plants in landscapes. The effect of seed priming on the morphological, physiological, and biochemical traits of <i>Catharanthus roseus</i> under salinity stress (0, 4, 6, and 8 dS/m) was studied in a greenhouse experiment. Seeds from the ‘Sunstorm Red’ cultivar were primed at different concentrations of salicylic acid (150, 250, and 350 ppm) and potassium nitrate (50 and 100 ppm). Results showed that the SPAD index reached its highest value of 80.69 at 6 dS/m with 350 ppm salicylic acid priming. Priming accelerated flowering, with the shortest duration to first flower bud appearance (91.70 days) and flowering (97.38 days) observed at 4 dS/m salinity with 150 ppm salicylic acid. Priming also reduced electrolyte leakage and enhanced stress tolerance mechanisms; proline content was highest with 350 ppm salicylic acid at moderate salinity, total flavonoid content peaked at 2.56&#xa0;mg/g FW with 150 ppm salicylic acid across salinities, and anthocyanin content reached 33.57&#xa0;mg/g FW with 350 ppm salicylic acid treatment. The antioxidant activity was maximized at 8 dS/m salinity with 50 ppm potassium nitrate priming. Salicylic acid priming was more effective in improving the morphological and physiological traits related to growth and photosynthesis, whereas potassium nitrate priming improved the biochemical responses. These results suggest that seed priming, particularly at 350 ppm salicylic acid or 50 ppm potassium nitrate, can improve ornamental quality and decrease the effects of salinity stress in <i>C. roseus</i>.</p>

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Seed Priming With Salicylic Acid and Potassium Nitrate: Evaluation of the Effect of Priming on the Flowering Stage of Catharanthus roseus. A Biochemical, Physiological, and Morphological Perspective

  • 期刊论文

  • 发表日期：

    2026年6月22日

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  • Azadeh Mousavi Bazaz,
  • Hajar Nemati,
  • Amirali Salavati Nik

摘要

Salinity is an abiotic stress that significantly reduces plant growth and the aesthetic value of ornamental plants in landscapes. The effect of seed priming on the morphological, physiological, and biochemical traits of Catharanthus roseus under salinity stress (0, 4, 6, and 8 dS/m) was studied in a greenhouse experiment. Seeds from the ‘Sunstorm Red’ cultivar were primed at different concentrations of salicylic acid (150, 250, and 350 ppm) and potassium nitrate (50 and 100 ppm). Results showed that the SPAD index reached its highest value of 80.69 at 6 dS/m with 350 ppm salicylic acid priming. Priming accelerated flowering, with the shortest duration to first flower bud appearance (91.70 days) and flowering (97.38 days) observed at 4 dS/m salinity with 150 ppm salicylic acid. Priming also reduced electrolyte leakage and enhanced stress tolerance mechanisms; proline content was highest with 350 ppm salicylic acid at moderate salinity, total flavonoid content peaked at 2.56 mg/g FW with 150 ppm salicylic acid across salinities, and anthocyanin content reached 33.57 mg/g FW with 350 ppm salicylic acid treatment. The antioxidant activity was maximized at 8 dS/m salinity with 50 ppm potassium nitrate priming. Salicylic acid priming was more effective in improving the morphological and physiological traits related to growth and photosynthesis, whereas potassium nitrate priming improved the biochemical responses. These results suggest that seed priming, particularly at 350 ppm salicylic acid or 50 ppm potassium nitrate, can improve ornamental quality and decrease the effects of salinity stress in C. roseus.