关键词: 早熟棉, 早熟棉, 纤维品质, 铃期

Abstract: The purpose of this study is to provide a theoretical basis for the development and utilization of salttolerant germplasm resources and the innovation of new salt-tolerant germplasm of sorghum. 20 accessions of sorghum were used as materials and treated with 150 mmol/L NaCl in the artificial climate chamber. The germination rate and germination potential were detected. The 20 accessions were placed in 25℃ constant temperature incubator for accelerating germination and irrigated with 150 mmol/L NaCl, the control was irrigated with the same amount of water. The seedling survival rate growth rate and wilting index were investigated and compared. The membership function was used for correlation analysis. The cluster analysis was also adopted in this study. The results showed that under the 150 mmol/L NaCl stress, the germination rate of‘3438’,‘space mutation breeding SP42’,‘09305R’and‘3560R’was higher than that of the control. And other indexes were lower than that of the control. In the 20 materials, 4 salt-resistant accessions were selected at sprouting stage, 3 salt-resistant accessions were selected at the seedling stage. The order of correlation was as following: relative bud length> relative root length> relative plant weight> germination potential. The 20 accessions of sorghum were clustered into five groups, including high salt-tolerant type, salt-tolerant type, medium salt-tolerant type, salt-sensitive type and high salt-sensitive type. In conclusion, 150 mmol/L NaCl is selected as the standard salt concentration for the identification of salt tolerance of sorghum cultivars. The germination rate, germination potential, root length, leaf length and fresh weight of plant could be used as identification indexes for salt tolerance of sorghum.