1.College of Agriculture,Shanxi Agricultural University,Taigu 030801,China
2.Center for Agricultural Genetic Resources Research,Shanxi Agricultural University/Key Laboratory of Crop Gene Resources and Germplasm Enhancement on Loess Plateau,Ministry of Agriculture,Taiyuan 030031,China
3.Panhandle Research and Extension Center,Department of Agronomy and Horticulture,University of Nebraska Lincoln,Scottsbluff 69361,USA
Soil salinization affects the sustainable development of agriculture and causes ecological imbalance. Cultivation of salt-tolerant plants is an important step to maximize economic benefits and optimize soil improvement. In order to provide identification index for breeding for new varieties of salt-tolerant broomcorn millet, and provide materials for the cultivation of broomcorn varieties in aline-alkali soil, in this study, five bred varieties of broomcorn millet were used as the test material, based on different concentrations of neutral salt mixture(NaCl and Na2SO4), using the dish germination method, eight agronomic traits including bud fresh weight(SFW), bud length(BL), germination index(GI), germination potential(GP), root fresh weight(RFW), germination rate(GR), root length(RL), and activity index(VI) were used to evaluate the salt tolerance of the materials. By analyzing the difference in germination potential and germination rate of the 5 broomcorn millet varieties under different salt concentrations, the results showed that 160 mmol/L was the optimal concentration for salt treatment. At this concentration, the variation of the eight indexes of the five materials was abundant, and the coefficient of variation was 168.41%, 48.12%, 23.13%, 15.11%, 32.94%, 18.90%, 64.37%, and 123.53%, respectively. Correlation analysis, principal component analysis, and comprehensive evaluation of D value of the eight indexes found that 5 indexes including SFW, BL, GI, GP, and RFW could be taken as the reference indexes of salt tolerance evaluation.The salt tolerance of the five materials from strong to weak was: Jinshu 7, Longshu 19, Ningmi 13, Qishu 1, and Longshu 9.
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