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Xinjiang, especially in the southern Xinjiang region, precipitation is scarce and the climate is arid. Land in this area suffers from varying degrees of salinization, which affects wheat growth and leads to reduced yields. Screening salt-tolerant germplasm resources is an effective approach to improving grain production capacity in southern Xinjiang. In this study, 42 spring wheat varieties approved and released in the Yellow River Irrigation District of Ningxia and its surrounding areas were used as experimental materials. Under 150 mmol·L-1 NaCl stress, germination and phenotypic indices were measured at the germination and seedling stages, and relative values of the 13 indices were calculated to comprehensively evaluate the salt tolerance of different varieties. The results showed that the relative values of most indices at the germination and seedling stages were below 100%. The coefficients of variation for germination energy, germination index, and vigor index at the germination stage exceeded 20%. At the seedling stage, the coefficients of variation for seedling height, above-ground fresh weight, above-ground dry weight, root dry weight, and root length were greater than 20%. Significant positive correlations were observed among the indices. The tested materials were classified into three categories via hierarchical cluster analysis: 15 salt-tolerant genotypes, 20 intermediate genotypes, and 7 sensitive genotypes. Ningchun 3, Ningchun 8, Ningchun 9, Ningchun 12, and Ningchun 35 exhibited superior salt tolerance and strong stress adaptability, which preliminarily verifies the feasibility of cross-regional introduction of Ningchun spring wheat germplasm resources, and providing material basis and methodological reference for breeding new salt-tolerant wheat varieties in southern Xinjiang.
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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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