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This study aims to investigate the effects of nano-priming technology on rice seed germination under salt stress, in order to provide technical support for rice cultivation in saline-alkali soils.
The japonica rice variety, Ningjing 47, was used as the experimental material. Salt stress treatments (0 and 150 mmol/L NaCl) were applied, and five concentrations of Fe-Mg nanoparticles (0, 50, 100, 200, and 400 mg/L) were tested under 150 mmol/L NaCl stress. The effects on seed germination, seedling growth, and physiological characteristics were examined.
The results showed that salt stress significantly inhibited rice seed germination and seedling growth. Nano-priming did not significantly affect germination percentage or germination potential but enhanced seedling growth. It increased the activities of superoxide dismutase (by 27.78%-76.39%), peroxidase (by 14.05%-38.71%), and catalase (by 18.67%-120.00%), as well as the content of ascorbic acid (by 4.40%-225.79%), soluble sugars (by 63.08%-145.96%), proline (by 10.33%-16.88%), and chlorophyll (by 45.38%-105.31%). It also reduced malondialdehyde content (by 16.94%-32.41%) and enhanced the selective transport coefficient for K+ over Na+.
The concentration of 200 mg/L Fe-Mg nanoparticles was identified as optimal for alleviating salt stress and promoting rice germination and seedling growth.
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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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