Effects of Erwinia persicina on germination and seedling growth of 20 varieties of alfalfa
[Objective]The study was carried out in order to explore the effects of Erwinia persicina on the ger-mination of alfalfa seeds and seedling growth.[Method]20 different alfalfa varieties were used as test materials.In this study,the method of inoculating the tested bacteria in a petri dish was used to study the effects of E.persicina on the germination rate,germination potential,germination index and seed vigor index of 20 varieties of alfalfa seeds,as well as the effects on seedling root length,plant length,fresh weight and dry weight.[Result]1)Compared with CK group,strain Cp2 inhibited seed germination of 20 alfalfa cultivars.The germination index and seed vigor index of all tested cultivars in Cp2 group decreased by 13.62%～33.46%and 23.10%～64.44%,respectively.2)The root length and plant height of all alfalfa cultivars in Cp2 group decreased by 20.68%～59.14%and 4.31%～46.30%,re-spectively.3)Strain Cp2 inhibited the fresh and dry weight of 20 alfalfa cultivars.4)According to the Topsis compre-hensive evaluation and analysis,,the overall effect of E.persicina on the varieties Salt Tolerant Star,Juneng 601 and Juneng 2 was found to be low.At the same time,it had a greater effect on the varieties of Juneng 995 and Huangguan and dry land.5)Strain Cp2 damaged the cell structure of roots,stems and leaves of Juneng 995.[Conclusion]The re-sults of this study provided a theoretical basis for further investigation of the pathogenicity of E.persicina to alfalfa and screening of resistant varieties of alfalfa.
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