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The present study investigated the ameliorative effects of 5-aminolevulinic acid (5-ALA) on muskmelon seedlings subjected to saline-alkali stress. Using the melon variety Zhongbao No.1 as the test material, under pot cultivation conditions, the study investigated the effects of root application of five different concentrations (25, 50, 100, 150, and 200 mg/L) of 5-ALA on the growth changes, photosynthetic pigments, reactive oxygen species (ROS) accumulation, osmotic adjustment, and antioxidant system of melon seedlings under 150 mg/L mixed salt-alkali stress. The results showed that under saline-alkali stress, exogenous 5-ALA at appropriate concentrations (100, 150 mg/L) significantly increased plant height, stem diameter, leaf length, leaf width, and leaf area of muskmelon seedlings. It also increased the contents of photosynthetic pigments and soluble sugars, proline content was reduced but still remained higher than that of CK, and significantly reducing both MDA content and O2- generation rate. Furthermore, the activity of antioxidant enzymes, specifically SOD, CAT, APX, and GR, along with GSH content, exhibited elevation. Although POD activity showed a decrease, it maintained significantly higher levels compared to the control treatment (CK). In addition, TOPSIS comprehensive evaluation analysis was conducted on different exogenous 5-ALA treatments based on all the above measurement indicators, and the results showed that SA150 treatment ranked first. Therefore, exogenous 5-ALA at a concentration of 150 mg/L exhibits the optimal effect in alleviating saline-alkali stress in muskmelon seedlings, which would provide a theoretical foundation for the cultivation of crops under saline-alkali stress conditions.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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