Study on strawberry root rot pathogen and changing diversity of fungal communities
Strawberry is a fruit with both nutritional and economic value.Continuous cropping of strawberry resulted in serious continuous cropping obstacle and gradually increased incidence rate,which seriously affected the yield of strawberry.In this study,the pathogens were isolated from the rhizosphere soil of strawberry with root rot and continuous cropping for three years.Pathogens were identified as Fusarium pseudocircinatum,Fusarium solani,Fusarium luffae,Aspergillus westerdijkiae,Cladosporium oxysporum,Ectophoma multirostrata,Neopestalotiopsis rosae and Neocosmospora rubicola.Studies analyzed the soil fungal changes in the rhizosphere of strawberry before and after continuous cropping.The results show that,total fungal numbers decreased after continuous cropping,the relative abundance of fungi such as Pulvinula,Aspergillus,Acremonium,Funneliformis,unclassified-Cercozoa and unclassified-Pezizaceae were significantly increased,the relative abundance of the unclassified_Hyppocreales,Mortierella and Rhizophlyctis was significantly reduced.The detection of the physical and chemical properties of soil after continuous cropping shows that the organic content is significantly reduced,the content of total phosphorus,nitrate nitrogen and pH value are significantly increased.The change of soil physical and chemical properties and the replacement of dominant bacteria are the reasons for the occurrence of strawberry continuous cropping obstacles.The research provides scientific basis for the prevention and control of strawberry root rot and continuous cropping obstacles.
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万方数据
