Impact of Soil Disinfestation on Fungal and Bacterial Communities in Soil With Cucumber Cultivation

Abstract

Soil treatment with disinfectants has been used for controlling soilborne phytopathogens. Besides suppressing specific pathogens, how these disinfectants impact soil health, especially soil microbial communities, is yet to be systemically determined. The objectives of this study were to examine the effects of three representative disinfectants, including the dazomet fumigant, fenaminosulf fungicide, and kasugamycin antibiotic on chemical properties, enzymatic activities, and microbial communities in soil for cucumber cultivation. Results showed that 14 days after soil treatment with these chemicals, residual content of dazomet and kasugamycin quickly declined in soil and were undetectable, while fenaminosulf residues were found at 0.48 ± 0.01 mg/kg. Total nitrogen and total carbon increased in soil after dazomet treatment. Urease and sucrase activities were significantly restrained after disinfectant application. The disinfectants did not significantly change the taxon of predominant bacteria and fungi but altered the relative abundance and diversity of soil microbiome, as well as microbial interspecific relationships. Moreover, cucumber cultivation enhanced the overall soil microbial diversity and enzymatic activities, which diminished the difference of soil microbiome among four treatments. The difference in soil microbial diversity among the four treatments became smaller after planting cucumber. Thus, soil microbial communities were affected by soil disinfectants and gradually recovered by cucumber application.

The Influence of Simulated Organic Matter on the Inactivation of Viruses: A Review

“…Thus, the garden soil considerably inhibited the efficacy of the three disinfectants, suggesting it may have some utility when studying the inactivation of foodborne viruses, potentially in produce processing settings. In previous studies done on bacterial applications, soil presence has not had as strong an impact on sanitizer performance [48,49]. Thus, this study is significant to our understanding of the behavioral differences between viruses and bacteria in their response to soil-based organic load presence.…”

Contributions of carbon source, crop cultivation, and chemical property on microbial community assemblage in soil subjected to reductive disinfestation

“…Besides, crop cultivation could also significantly affect bacterial and fungal community structures in the RSD-cropping system. This might be attributed to the crucial role of root exudates in regulating microbe colonization of the rhizosphere as well as activating native microbes (Wang et al, 2021).…”

Considerations for the inclusion of metabarcoding data in the plant protection product risk assessment of the soil microbiome

“…Furthermore, the dose range at which antimicrobials can inhibit the functioning of the microbiome can vary by an order of 1000 depending on the soil (Ivashchenko et al, 2018), which would present challenges in defining standardized test guidelines. Wang et al (2021) studied the effects of the soil disinfectants dazomet, fenaminosulf, and kasugamycin on the soil microbiome; however, these compounds did not alter the predominant bacterial taxa of soil bacteria but did impact the relative abundance and diversity of the soil communities. It is unknown if these changes would be sufficient to generate a significant enough impact on the soil microbiome to satisfy the needs of any potential validity criteria.…”