Pathogenicity of Rhizoctonia solani to alfalfa seedlings and disease resistance of alfalfa varieties

doi:10.11686/cyxb2015197

Abstract

Abstract: The aim of this study was to evaluate the pathogenicity of Rhizoctonia solani isolates to various alfalfa (Medicago sativa) varieties. We used 14 varieties of alfalfa and six pathogen isolates that were isolated from roots of six different alfalfa varieties from three locations. We estimated the disease index, relative germination rate, relative root length, and relative seedling length at 14 days after inoculation with the various isolates. There were significant differences among the 14 alfalfa varieties inoculated with the six pathogen isolates (P<0.05). The isolate from ‘Goldenqueen’ showed significantly stronger pathogenicity (P<0.05) than the other isolates. The isolate from ‘Powerplant’ showed the weakest pathogenicity. All the fungi used in this study resulted in lower germination rates and shorter roots of alfalfa seedlings, and the isolate from ‘Goldenqueen’ showed the strongest effects. Based on the comprehensive evaluation of all traits, R. solani isolated from ‘Goldenqueen’, ‘8920MF’, and ‘Affinity’ showed the strongest pathogenicity to alfalfa seedlings. Among the 14 alfalfa varieties, ‘Vernal’, ‘Algonguin’, and ‘Alfaking’ were more resistant to R. solani, while ‘Powerplant’ and ‘Amerileaf 721’ were the most sensitive.

GUO Yu-Xia, ZHANG Ming, GUAN Yong-Zhuo, LIU-Fang, GUO Zhi-Peng, ZHANG Hong-Rui, YAN Xue-Bing, WANG Cheng-Zhang. Pathogenicity of Rhizoctonia solani to alfalfa seedlings and disease resistance of alfalfa varieties[J]. Acta Prataculturae Sinica, 2015, 24(11): 72-81.

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