Evaluation of salt tolerance of 80 introduced alfalfa varieties during germination
In this study,the effects of salt stress on root length,bud length,germination index,germination rate,germination energy,vitality index and root-bud ratio of 80 introduced alfalfa varieties treated with 1.2％NaCl were studied through laboratory germination test.A comprehensive evaluation of the salt tolerance of alfalfa during its germination period was conducted using a combination of principal component analysis,membership function,and cluster analysis.The results showed that salt stress significantly affected the germination energy,germination rate,and germination index of alfalfa(P＜0.01),and the coefficient of variation between different varieties ranged from 0.008 to 0.723.The cumulative contribution rate of the two principal components was 73.922％.The germina-tion energy and root-bud ratio were used as the main salt tolerance indicators for salt tolerance screening during the germination period of alfalfa.The clustering analysis results divided 80 alfalfa varieties into 5 levels,including 9 va-rieties with strongest salt tolerance,14 varieties with strong salt tolerance,43 varieties with moderate salt tolerance,13 varieties with weak salt tolerance,and 1 variety with the weakest salt tolerance.On this basis,varieties of alfalfa with strong salt tolerance during the germination period were selected as follows:WL168HQ,Tourists,Tianma,Dite,Juneng 801,and Juneng 995.
万方数据
维普
