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<p>In this study, several morphological and metabolic parameters were used to investigate the effects of salt stress on the germination and subsequent growth of two radish varieties cultured on Murashige and Skoog (1962) medium. Seeds of both varieties were surface-sterilized and placed on MS medium supplemented with different NaCl concentrations (0, 4, 8, 12, 16, 20&#xa0;g/L). The results showed that the Rouge Globe and Flamboyant varieties responded differently to increasing salinity. Compared with the Flamboyant variety, which exhibited a germination rate of 44.17%, Rouge Globe showed higher performance, reaching a germination rate of 75.83%. In addition, at 20&#xa0;g/L NaCl, Rouge Globe maintained some germination capacity (35%), indicating lower sensitivity to salinity at the germination stage compared with Flamboyant, which failed to germinate. Salinity significantly reduced vegetative growth in both varieties. Under control conditions, the mean shoot and root lengths were 5.05&#xa0;cm and 9.75&#xa0;cm, respectively, for Rouge Globe, and 5.32&#xa0;cm and 10.7&#xa0;cm, respectively, for Flamboyant. Increasing NaCl concentrations caused a marked reduction in these parameters. At 16&#xa0;g/L NaCl, shoot and root lengths decreased to 0.68&#xa0;cm and 1.62&#xa0;cm, respectively, in Rouge Globe, and to 0.05&#xa0;cm and 0.17&#xa0;cm, respectively, in Flamboyant. Both varieties showed increased osmolyte accumulation under salinity, indicating physiological adjustment to salt stress. At 8&#xa0;g/L NaCl, Rouge Globe showed significant increases in soluble sugars (0.13 to 1.26&#xa0;mg/g), phenolic compounds (0.90 to 1.35&#xa0;mg/g), flavonoids (0.07 to 0.94&#xa0;mg/g), and proline (7.01 to 25.28&#xa0;µg/g). Similarly, Flamboyant showed increases in soluble sugars (0.59 to 1.816&#xa0;mg/g), phenolic compounds (1.69 to 1.98&#xa0;mg/g), flavonoids (0.29 to 0.67&#xa0;mg/g), and proline (1.98 to 17.87&#xa0;µg/g). These results indicate a physiological response to saline conditions in both varieties. Total chlorophyll content showed a slight, non-significant increase.</p>

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Effects of salt stress on the germination, growth and physiological development of two radish varieties (Raphanus sativus L.)

  • 期刊论文

  • 发表日期：

    2026年2月3日

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  • Nagla Abid,
  • Khadija Amzil,
  • Fatima Zahra Akhrif,
  • Ilham El Qadmi,
  • Fatima Zahra Rhebbar,
  • Doha Boumalik,
  • Mahmoud Oudghiri,
  • Rabea Ziri,
  • Najiba Brhadda

摘要

In this study, several morphological and metabolic parameters were used to investigate the effects of salt stress on the germination and subsequent growth of two radish varieties cultured on Murashige and Skoog (1962) medium. Seeds of both varieties were surface-sterilized and placed on MS medium supplemented with different NaCl concentrations (0, 4, 8, 12, 16, 20 g/L). The results showed that the Rouge Globe and Flamboyant varieties responded differently to increasing salinity. Compared with the Flamboyant variety, which exhibited a germination rate of 44.17%, Rouge Globe showed higher performance, reaching a germination rate of 75.83%. In addition, at 20 g/L NaCl, Rouge Globe maintained some germination capacity (35%), indicating lower sensitivity to salinity at the germination stage compared with Flamboyant, which failed to germinate. Salinity significantly reduced vegetative growth in both varieties. Under control conditions, the mean shoot and root lengths were 5.05 cm and 9.75 cm, respectively, for Rouge Globe, and 5.32 cm and 10.7 cm, respectively, for Flamboyant. Increasing NaCl concentrations caused a marked reduction in these parameters. At 16 g/L NaCl, shoot and root lengths decreased to 0.68 cm and 1.62 cm, respectively, in Rouge Globe, and to 0.05 cm and 0.17 cm, respectively, in Flamboyant. Both varieties showed increased osmolyte accumulation under salinity, indicating physiological adjustment to salt stress. At 8 g/L NaCl, Rouge Globe showed significant increases in soluble sugars (0.13 to 1.26 mg/g), phenolic compounds (0.90 to 1.35 mg/g), flavonoids (0.07 to 0.94 mg/g), and proline (7.01 to 25.28 µg/g). Similarly, Flamboyant showed increases in soluble sugars (0.59 to 1.816 mg/g), phenolic compounds (1.69 to 1.98 mg/g), flavonoids (0.29 to 0.67 mg/g), and proline (1.98 to 17.87 µg/g). These results indicate a physiological response to saline conditions in both varieties. Total chlorophyll content showed a slight, non-significant increase.