Abstract
To clarify the control effects of Trichoderma hamatum strain MHT1134 on Fusarium wilt in continuous pepper cropping fields and its regulatory effects on soil microecology, the physical and chemical properties, enzyme activities, community structures of soil samples from five field types were analysed. Samples were taken from fields that had been continuously planted for 1, 5, 9 years, and applied the strain MHT1134 for 1 and 2 years. The MHT1134 control effects on pepper wilt after application 1 year and 2 years were 63.03% and 70.21%, respectively. 4 kinds of physical and chemical indexes and 6 kinds of enzyme activities in soil were increased. With the continuous cropping years increased, the microbial abundance and diversity decreasing significantly. The relative abundances of Fusarium, Gibberella increased along with the planting years, but decreased after the MHT11134 application. However, the relative abundances of Trichoderma and Chaetomium significantly increased. Additionally, as the cropping years increased, the soil abundance of Actinobacteria gradually decreased, but it significantly increased from 17.56 to 22.44% after the MHT1134 application. Thus, strain MHT1134 effectively improved the microbial community structure of the soil, and it also positively affected soil quality. A continuous application may improve the control effect.
Highlights
To clarify the control effects of Trichoderma hamatum strain MHT1134 on Fusarium wilt in continuous pepper cropping fields and its regulatory effects on soil microecology, the physical and chemical properties, enzyme activities, community structures of soil samples from five field types were analysed
To prepare the MHT1134 fermented broth, the strain was inoculated on potato dextrose agar (PDA) plates in the dark at 28 °C for 7 days
Before the investigation of strain MHT1134 control effect, pepper plants with the same wilt symptoms were collected from continuous pepper cultivation for 9 years (CC9), TR1 and TR2 fields
Summary
To clarify the control effects of Trichoderma hamatum strain MHT1134 on Fusarium wilt in continuous pepper cropping fields and its regulatory effects on soil microecology, the physical and chemical properties, enzyme activities, community structures of soil samples from five field types were analysed. Zhong et al.[11] found that applying bio-organic fertilizer for two consecutive years significantly reduces the F. oxysporum level and makes the soil culturable microbial community structure more balanced, but it improves yield and fruit quality of banana. The Illumina MiSeq 2500 high-throughput sequencing platform was used to study the effects of a continuous 2 years application (twice application per year) of the biocontrol fungal strain MHT1134 fermentation broth on the microbial community structure and physicochemical properties of pepper rhizosphere soils in continuous cropping fields. The aim is to explore the soil microbiological mechanisms used by the biocontrol fungal MHT1134 against pepper Fusarium wilt
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