大豆成苗期耐盐碱种质综合评价OA

The soybean seedling stage refers to the growth period from seed germination to cotyledon formation.Saline-alkali stress severely impairs soybean seed germination and seedling establishment.Establishing an evaluation method for saline-alkali tolerance at the soybean seedling stage is crucial for screening saline-alkali-tolerant soybean germplasms and variety breeding.In this study,144 soybean germplasm resources were used as materials.Germination-related indicators were determined,and comprehensive evaluation was conducted combined with multivariate statistical analysis.The results showed that there were significant positive correlations among the six indicators.The cumulative contribution rate of the first four principal components reached 89%,which could fully reflect the genetic information related to saline-alkali tolerance in soybean during the seedling stage.Based on the comprehensive evaluation F-values,the 144 soybean germplasms were clustered into four groups,including 18 saline-alkali-tolerant accessions,36 moderately tolerant accessions,60 moderately saline-alkali-sensitive accessions,and 30 extremely sensitive accessions.Stepwise regression analysis screened the core evaluation indicators for saline-alkali tolerance at the soybean seedling stage,and the constructed comprehensive evaluation model could effectively predict the saline-alkali tolerance of soy-beans at this stage.