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- Title
Comparative effects of two humic substances on microbial dysbiosis in the rhizosphere soil where cucumber (Cucumis sativus L.) is grown.
- Authors
Jiang, Nan; Wu, Meng; Li, Guilong; Li, Pengfa; Liu, Ming; Li, Zhongpei
- Abstract
The extraction of humic substances from weathered coal and peat has been regarded as an effective way to utilize these wastes. However, the effects of humic acid (HA) and sodium humate (HN) (derived from weathered coal and peat, respectively) on soil microbial dysbiosis remain elusive. By virtue of Illumina sequencing and FUNGuild, we investigated the interrelationships between soil microbial communities and potential phytopathogenic fungi, found that merely HA surprisingly (p < 0.05) reduced the relative richness of potential phytopathogenic fungi in contrast to the controls. The relative abundances of potential pathogenic fungi, fungal community structures, network degrees, and the average degrees of potential pathogenic fungi were recognized as the crucial factors for the determination of cucumbers' aboveground biomasses via Random Forest classification. In addition, the aboveground biomasses were significantly (p < 0.05) and negatively related to the relative richness of potential pathogenic fungi. Among the 28 operational taxonomic units (OTU) that played the most important roles in determining the relative abundance of potential phytopathogenic fungi, 3 OTU belonging to the Penicillium and Nocardioides genera were significantly (p < 0.05) more abundant in the HA treatment. Therefore, it was obvious that HA facilitated the growth of beneficial microbes and increased the microbial network complexity, subsequently decreasing the relative abundance of phytopathogenic fungi and consequently increasing cucumbers' aboveground biomasses. The present research not only highlighted the differences between humic substances originating from weathered coal and peat but also indicated the significance of humic substances in regulating microbial communities, suppressing potential phytopathogenic fungi and facilitating cucumber growth.
- Subjects
HUMUS; CUCUMBERS; PHYTOPATHOGENIC fungi; RHIZOSPHERE; PATHOGENIC fungi
- Publication
Land Degradation & Development, 2022, Vol 33, Issue 11, p1944
- ISSN
1085-3278
- Publication type
Article
- DOI
10.1002/ldr.4275