甜高粱是最具有发展前景的绿色能源作物之一,耐盐碱力强,可利用当前多数大田作物不能利用的盐渍化土地。在甜高粱品种耐盐性评价的基础上筛选NaCl较敏感品种甜秆秫秫(TGSS)和较耐品种M81E为试验材料,研究了NaCl胁迫对甜高粱种子萌发和幼苗生长的影响。结果表明,80 mmol/L NaCl和160 mmol/L NaCl对种子发芽率和发芽势均具有明显的抑制作用,二者差异不显著;芽期耐盐指数可用于评价品种芽期耐盐性,M81E芽期对NaCl胁迫比TGSS敏感;160 mmol/L NaCl胁迫下,甜高粱根系和植株地上部分生长均受到明显的抑制;根系长度对NaCl胁迫比根鲜重更敏感,160 mmol/L NaCl胁迫下,TGSS的相对减少量明显高于M81E;NaCl胁迫对地上部分鲜重、植株总鲜重及叶面积的抑制作用与对根系长度的相似,TGSS的相对减少量亦明显高于M81E;NaCl胁迫对地上部分的抑制作用高于对根系的抑制作用。 Sweet sorghum is one of the most promising green energy crops with strong saline-alkali resistance and can utilize salinized land that most current field crops can not utilize. The effects of NaCl stress on the seed germination and seedling growth of sweet sorghum were studied on the basis of evaluating the salt tolerance of sweet sorghum cultivars, which were the susceptible varieties of sweet corn stalk (TGSS) and the more tolerant variety M81E. The results showed that 80 mmol / L NaCl and 160 mmol / L NaCl had significant inhibitory effect on seed germination rate and germination potential, but the difference was insignificant. The salt tolerance index at budding stage could be used to evaluate the salt tolerance of M81E NaCl stress was more sensitive to TGSS than that of TGSS at 160 mg / L NaCl stress. Roots and shoots of sweet sorghum plants were significantly inhibited under 160 mmol / L NaCl stress. Root length was more sensitive to NaCl stress than fresh weight of roots. Under 160 mmol / L NaCl stress , And the relative reduction of TGSS was significantly higher than that of M81E. The inhibitory effects of NaCl stress on fresh weight aboveground, fresh weight of plant and leaf area were similar to that of root length, and the relative reduction of TGSS was also significantly higher than that of M81E. The aboveground part of the inhibition is higher than the inhibition of the root system.