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To clarify the alleviating effect of auxin regulators on low-temperature stress at seedlings stage of soybean, the variety Kennong 18 was used as the test material, and seed coating with sodium naphthaleneacetic acid (NAA-Na), potassium indolebutyrate (IBA-K), and their mixture were adopted as the treatment. From the perspectives of morphological phenotype, antioxidant defense and osmotic regulation, the alleviating effect of NAA-Na and IBA-K on the growth and yield of soybean under low temperature stress was investigated. The results showed that the coating treatment with NAA-Na and IBA-K could reduce the accumulation of reactive oxygen species and the production rate of superoxide anion (O2-. ), and significantly decrease the accumulation of hydrogen peroxide (H2O2) and malondialdehyde. The osmotic regulation ability of soybean seedlings was enhanced, and the contents of soluble sugar, soluble protein, and proline increased. The activities of antioxidant enzymes such as superoxide dismutase, peroxidase, and catalase were enhanced, and the ascorbic acid-glutathione (AsA-GSH) cycle was promoted, thereby alleviating the damage of low-temperature stress to soybean seedlings. The dry matter accumulation in the aboveground and root parts of soybean seedlings increased. The adverse effects of low temperature stress on soybean yield were mitigated, and the number of pods per plant, the number of seeds per plant, 100-seed weight, and the seed weight per plant were significantly increased.
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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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