Abstract: Amaranthus hybridus is a new type of forage grass with high quality, which has a great difference in salt-alkali tolerance among different varieties. To select the germplasm resources and breeding materials with high saline-alkali tolerance, seeds of 8 A. hybridus genotypes were germinated in a sterilized NaHCO₃ solution (100 mmol·L^-1, pH=8.35). In this study, the seed germination traits including germination potential, germination rate, germination index, root length and bud length were investigated. The results showed that the response of 8 A. hybridus to saline-alkali stress was different, and compared with the control group, saline-alkali stress inhibited the seed germination and seeding growth of all A. hybridus genotypes. The membership function was used to synthetically assess the salt tolerance of 8 A. hybridus in germination stage. The results indicated that the 8 resources can be arranged as follows in the decreasing order of salt tolerance:Ahb1 > Ahb911 > Ahb2 > Ahb984 > Ahb979 > Ahb1025 > Ahb986 > Ahb1011.

Key words: Amaranthus hybridus, Alkaline salt stress, Seed germination

摘要： 绿穗苋（Amaranthus hybridus）是一种新型的优质牧草，不同品种的绿穗苋耐盐碱性差异较大。为了筛选耐盐碱性强的优良种质资源和育种材料，本研究选用8份不同基因型的绿穗苋种子为试验材料，采用培养皿滤纸发芽法测定分析了盐碱（100 mmol·L^-1NaHCO₃溶液，pH 8.35）胁迫对种子发芽势、发芽率、发芽指数、根长和芽长等性状的影响。结果表明，参试的8份绿穗苋种子在NaHCO₃胁迫下发芽指数和活力指数均受到一定的抑制，且不同材料对NaHCO₃胁迫的响应具有明显差异。通过模糊隶属函数对8份绿穗苋种子萌发期耐盐碱性进行综合性评价，结果表明，不同基因型的绿穗苋种子的耐盐碱性由强到弱顺序为：Ahb1 > Ahb911 > Ahb2 > Ahb984 > Ahb979 > Ahb1025 > Ahb986 > Ahb1011。

关键词: 绿穗苋, 碱性盐胁迫, 种子发芽