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<p>To investigate the effects of different concentrations of exogenous lanthanum chloride treatment on the germination of melon seeds and physiological characteristics of seedlings, and to screen for the most suitable exogenous lanthanum chloride concentration for melon germination and seedling growth. Using ‘Emerald’ melon seeds as the test material, a germination experiment was conducted by soaking. A completely blank control group (CK) was set up, with 7 treatment groups from T1 to T6. Add lanthanum chloride solutions containing 0 (CK), 50 (T1), 100 (T2), 150 (T3), 200 (T4), 250 (T5), and 300 mg·L<sup>− 1</sup> (T6) of lanthanum chloride for treatment. Compared with the CK group, a suitable concentration of lanthanum chloride solution can promote the germination of melon seeds and seedling growth, while high concentration inhibits growth. Compared with the CK group, a suitable concentration of lanthanum chloride solution can promote melon seed germination and seedling growth, while high concentration inhibits growth. In terms of physiological indicators, compared with CK, the low concentration lanthanum chloride T1 group (50 mg·L<sup>− 1</sup>) significantly increased the activities of SOD (Superoxide Dismutase), POD (Peroxidase), and CAT (Catalase）by 15.79%, 13.29%, and 58.24%, respectively (<i>P</i> &lt; 0.05). The enzyme activity of the T3 group with medium concentration lanthanum chloride further increased, with SOD, POD, and CAT activities increasing by 35.53%, 43.55%, and 263.46% respectively compared to the CK group (<i>P</i> &lt; 0.05). However, the high concentration lanthanum chloride T6 group (300 mg·L<sup>− 1</sup>) significantly inhibited enzyme activity. Compared with the CK group, SOD, POD and CAT activities decreased by 5.56%, 4.38% and 75.19%, respectively (<i>P</i> &lt; 0.05), while POD increased by 62.85% (<i>P</i> &lt; 0.05). At the same time, chlorophyll levels in T1, T2, T3, T4, and T5 groups significantly increased by 28.92%, 60.60%, 44.40%, 27.15%, and 15.01% compared to CK, while T6 group significantly decreased by 12.25% (<i>P</i> &lt; 0.05). The addition of 150&#xa0;mg · L⁻¹ exogenous lanthanum chloride has the best promoting effect on the germination of melon seeds and seedling growth, and various growth physiological indicators are significantly better than other treatment groups.</p>

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The Effect of Exogenous Rare Earth Element Lanthanum on the Germination of Melon (Cucumis Melo L.) Seeds and the Growth and Physiology of their Seedlings

  • 期刊论文

  • 发表日期：

    2026年2月16日

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  • Chun Liu,
  • Wu Chen,
  • Caiyan Dong,
  • Ruonan Fang,
  • Chang Dong,
  • Zihao Ding,
  • Huijun Zhang,
  • Xingwang Zhang

摘要

To investigate the effects of different concentrations of exogenous lanthanum chloride treatment on the germination of melon seeds and physiological characteristics of seedlings, and to screen for the most suitable exogenous lanthanum chloride concentration for melon germination and seedling growth. Using ‘Emerald’ melon seeds as the test material, a germination experiment was conducted by soaking. A completely blank control group (CK) was set up, with 7 treatment groups from T1 to T6. Add lanthanum chloride solutions containing 0 (CK), 50 (T1), 100 (T2), 150 (T3), 200 (T4), 250 (T5), and 300 mg·L− 1 (T6) of lanthanum chloride for treatment. Compared with the CK group, a suitable concentration of lanthanum chloride solution can promote the germination of melon seeds and seedling growth, while high concentration inhibits growth. Compared with the CK group, a suitable concentration of lanthanum chloride solution can promote melon seed germination and seedling growth, while high concentration inhibits growth. In terms of physiological indicators, compared with CK, the low concentration lanthanum chloride T1 group (50 mg·L− 1) significantly increased the activities of SOD (Superoxide Dismutase), POD (Peroxidase), and CAT (Catalase）by 15.79%, 13.29%, and 58.24%, respectively (P < 0.05). The enzyme activity of the T3 group with medium concentration lanthanum chloride further increased, with SOD, POD, and CAT activities increasing by 35.53%, 43.55%, and 263.46% respectively compared to the CK group (P < 0.05). However, the high concentration lanthanum chloride T6 group (300 mg·L− 1) significantly inhibited enzyme activity. Compared with the CK group, SOD, POD and CAT activities decreased by 5.56%, 4.38% and 75.19%, respectively (P < 0.05), while POD increased by 62.85% (P < 0.05). At the same time, chlorophyll levels in T1, T2, T3, T4, and T5 groups significantly increased by 28.92%, 60.60%, 44.40%, 27.15%, and 15.01% compared to CK, while T6 group significantly decreased by 12.25% (P < 0.05). The addition of 150 mg · L⁻¹ exogenous lanthanum chloride has the best promoting effect on the germination of melon seeds and seedling growth, and various growth physiological indicators are significantly better than other treatment groups.