Journal of Zhejiang Agricultural Sciences ›› 2025, Vol. 66 ›› Issue (11): 2696-2701.DOI: 10.16178/j.issn.0528-9017.20240659

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Dynamic effects of different concentrations of magnesium on the photosynthetic characteristics and antioxidant activity of new leaves in Cunninghamia lanceolata

ZHANG Xiao1(), WANG Fenglin2, CAO Guangqiu2,3, YE Yiquan2,3   

  1. 1 Qinling National Botanical Garden, Xi'an 710404, Shaanxi
    2 College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, Fujian
    3 Chinese Fir Engineering Technology Research Center of National Forestry and Grassland Administration, Fuzhou 350002, Fujian
  • Received:2024-08-14 Online:2025-11-11 Published:2025-12-01

Abstract:

To investigate the effects of magnesium on the growth of Cunninghamia lanceolata, this study used one-year Cunninghamia lanceolata as test materials and designed three magnesium concentration nutrient solutions, Mg0 (0 mmol·L-1), Mg1 (1 mmol·L-1), and Mg3 (3 mmol·L-1). The dynamic effects of different concentrations of magnesium on the photosynthetic pigment content, chlorophyll fluorescence parameters, malondialdehyde (MDA) content, superoxide dismutase (SOD) activity, catalase (CAT) activity, and peroxidase (POD) activity in newly formed leaves of Cunninghamia lanceolata were analyzed. The results showed that the content of photosynthetic pigments in new leaves of Cunninghamia lanceolata seedlings under Mg1 and Mg3 treatment was significantly (p<0.05) higher than that under Mg0 treatment on 60 and 90 days of growth. The chlorophyll fluorescence parameters under Mg1 or Mg3 treatment were significantly higher than those under Mg0 treatment on 60 and 120 days of growth. On 120 days of growth, POD and CAT activities were significantly higher under Mg1 and Mg3 treatment than that under Mg0 treatment, and MDA content was significantly lower than that under Mg0 treatment. Therefore, 1 mmol·L-1 may be the critical point for magnesium to promote effective growth of new leaves of Cunninghamia lanceolata.

Key words: Cunninghamia lanceolata, magnesium concentration, photosynthetic pigment, chlorophyll fluorescence, antioxidant enzyme activity

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