Welcome to Chinese Journal of Tropical Crops,

Chinese Journal of Tropical Crops ›› 2020, Vol. 41 ›› Issue (5): 912-920.DOI: 10.3969/j.issn.1000-2561.2020.05.010

• Phytophysiology and Biochemistry • Previous Articles     Next Articles

Effects of Simulated Salinization on Seed Germination and Physiological Characteristics of Muskmelon Seedlings

ZHANG Beibei1,FAN Jiaru1,WANG Jingrong1,HAN Xiaoyun1,YUAN Huimin1,Gefu WANG-PRUSKI1,2,*(),ZHANG Zhizhong1,*()   

  1. 1. Joint FAFU-Dalhousie Lab / College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
    2. Faculty of Agriculture, Dalhousie University, Truro, Nova Scotia B2N 5E3, Canada
  • Received:2019-07-30 Revised:2019-09-15 Online:2020-05-25 Published:2020-06-15
  • Contact: Gefu WANG-PRUSKI,ZHANG Zhizhong


Using muskmelon cultivar ‘Xinyinhui’ as the material, the effects of salinization on the germination of muskmelon seeds were observed after treated by NaCl and NaHCO3 alone and combined. At the same time, some physiological and biochemical indexes related to saline-alkali stress were measured. The results showed that the simulated salinization of NaCl, NaHCO3, NaCl and NaHCO3 could inhibit seed germination. The inhibition increased with the increase of stress concentration and the extension of stress time. Only low concentration (50 mmol/L) of NaCl showed a certain promoting effect. The activities of superoxide dismutase (SOD) and catalase (CAT) first increased, then decreased, and then turned to an upward trend during the germination of muskmelon seeds treated with NaCl and NaHCO3. Peroxidase (POD) activity increased first and then decreased. Proline (Pro) content continued to rise, while soluble sugar content continued to decline. Malondialdehyde (MDA) content was always significantly higher than that of the control group treated with distilled water. Starch content decreased with the extension of treatment time. The activity of α-amylase and β-amylase decreased first and then increased. Generally speaking, simulated salinization significantly inhibited the seed germination and seedling growth of muskmelon, and protective enzymes and starch metabolism significantly participated in the response to salt-alkali stress. The results would help to reveal the response mechanism of muskmelon seeds to salinization stress during germination, and provide theoretical and practical references for facility seedling raising and plant cultivation in saline-alkali environment.

Key words: muskmelon, salinization, seed germination, protective enzyme, starch metabolism

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