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| Response characteristics of soil fungi to metam sodium fumigation |
| Received:November 17, 2020 |
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| KeyWord:metam sodium;soil;plant pathogenic fungi;community composition;interspecific relationship;fumigant |
| Author Name | Affiliation | E-mail | | ZHAO Xiao-dong | Department of Biology, Taiyuan Normal University, Yuci 030619, China
Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Tianjin 300191, China | | | ZHAO Peng-yu | Department of Biology, Taiyuan Normal University, Yuci 030619, China | | | LI Xiao-jing | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Tianjin 300191, China | lixiaojing@caas.cn | | YAN Ping-mei | Department of Biology, Taiyuan Normal University, Yuci 030619, China | | | REN Tian-zhi | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Tianjin 300191, China | | | LI Yong-tao | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | |
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| Abstract: |
| In order to reveal the effect of fumigants on the soil ecosystem, the variation in the soil fungal community composition, and the interspecific relationships after fumigation were explored. Metam sodium was selected as a typical fumigant for the soil of cucumber, continuously cropped for three years. After different periods, the fungal communities in each treatment were detected by high-throughput sequencing. Compared with the non-fumigation treatment(NM), the Chao 1 index decreased by 14%(P=0.001), and 16%(P=0.005) in the fumigation treatment with a low concentration(LM, 50 mg·kg-1), and a high concentration of metam sodium(HM, 100 mg·kg-1), respectively. The discrepancy in the fungal community structures as a result of the different treatments was also significant. The genera, Gibberella and Fusarium(typical, potentially pathogenic fungi of the soil), were inhibited by metam sodium fumigation, especially in the HM treatment, and declined by 95% and 53%(P<0.05), respectively, compared to the NM treatment.In contrast, some typical, potentially beneficial fungi(such as Talaromyces and Arthrographis) were inversely related to the potentially pathogenic fungi, and this trend was more obvious in the HM treatment. Compared to the NM treatment, the abundance of Gibberella and Fusarium in LM showed decline increase trend, in comparison, the abundance of Gibberella and Fusarium in the HM treatment always decreased over time. According to the network analysis, the abundance of different functional fungi in the NM treatment showed positive correlation, with dominant fungi antagonistic to potentially pathogenic fungi appearing in the HM treatment. Compared to low concentration metam sodium fumigation, high concentration metam sodium not only effectively inhibited the activity of potentially pathogenic fungi in the soil, but also strengthened the antagonistic effect of dominant fungi on potentially pathogenic fungi by regulating the interspecific relationships in the fungal community, and indirectly enhanced the activity of some beneficial bacteria. |
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