Identification and pathogenicity of the pathogen causing root rot on continuous-cropping foxtail millet
Foxtail millet(Setaria italica(L.)Beauv.),a novel model species in C4 gramineae crops,plays a principal role in food security in Africa and Asia and in the adjustment of the crop planting structure in China.It is sensitive to continuous cropping,which is a serious constraint to the production and the quality.Root rot di-sease is typical for the diseased foxtail millet in continuous cropping fields.In this study,a fungus was obtained from the rotten root millet samples and grouped according to their colony morphology,namely,YDSi-1,YDSi-2 and YDSi-3.According to pathogenic tests fulfilling the Koch's postulate,YDSi-3 showed a strong pathoge-nicity for root rot of foxtail millet.Based on morphological and molecular identification,YDSi-3 was identified as Fusarium oxysporum.This is the first report of F.oxysporum causing root rot of foxtail millet in China,and will provide a theoretical basis and technical support for the control on the continuous cropping of foxtail millet in the future.
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