Identification and Biological Characteristics of the Root Rot Pathogen of Knoxia roxburghii
[Objective]In order to isolate and identify the pathogen of root rot of Knoxia roxburghii and master the biological characteristics of the pathogen.[Method]According to the morphological characteristics of the pathogen,combined with ITS-5.8S rDNA,tub2 and ACT se-quence analysis,the pathogenicity test was carried out according to Koch's Rule.[Result]The morphologically consistent pathogen was re-isolated from the inoculated plants and finally identified as Boeremia exigua.The studies of biological characteristics showed that the optimum growth medium of pathogen was PDA,the optimum growth temperature was 20℃or 25℃,and the optimum pH was 5.The optimum carbon source was lactose,and the optimum nitrogen source was potassium nitrate.[Conclusion]This is the first report of B.exigua causing root rot of K.roxburghii in China.Mastering its biological characteristics will lay a theoretical foundation for the prevention of root rot of K.roxburghii.
万方数据
维普
