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Soil salinization is one of the important factors limiting crop growth. Cultivating new salt-tolerant rice varieties is of great significance to expand rice planting area. In order to explore the change trend of growth and physiology of different varieties of rice seedlings and clarify the salt tolerance of different rice varieties at seedling stage, five rice varieties were used as the experimental materials. The effects of different concentrations of NaCl (0 mmol/L, 70 mmol/L, 140 mmol/L) on the growth and related physiological indexes were studied at rice seedlings using hydroponic method. The principal component analysis and membership function method were used to comprehensively evaluate the salt tolerance of five rice seedlings. The results showed that under salt stress, salt inhibited the root length, root surface area, root volume, root tip number and root mean diameter of all rice varieties in general. The root growth index values of 'HH11' and 'Nipponbare' changed little. The root length, root volume, root surface area and root tip number of '9311' and 'JX99' were significantly inhibited. The average root tip number of 'HD961' was the largest among the five rice varieties. With the increase of NaCl concentration, the plant height and root activity of each variety showed a gradual downward trend, and the total chlorophyll content, relative conductivity, MDA content, proline content and Na+/K+ of root showed an overall upward trend, and the root Na+ and K+ contents showed a trend of first increase and then decrease. Among them, the relative electrical conductivity and proline content of '9311' and 'JX99' increased the most, the MDA and root Na+/K+ of 'Nipponbare' and 'HH11' increased the least, the plant height of Nipponbare decreased the least, and the root activity of 'HH11' decreased the least under salt stress. Principal component analysis showed that three independent comprehensive indexes explained 94.23% of the changes of 16 single indexes under salt stress. Among them, root length, root volume, root tip number, total chlorophyll content, malondialdehyde content and electrical conductivity could be used as the main factors to evaluate salt tolerance at seedling stage, and K+, Na+/K+ and plant height could be used as the secondary factors to evaluate salt tolerance at seedling stage. The results of membership function analysis showed that the salt tolerance of the five rice varieties from strong to weak was 'HH11'>'HD961'>'Nipponbare'>'9311'>'JX99'.
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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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