Effects of microbial organic fertilizers on Astragalus membranaceus growth and rhizosphere microbial community
Tóm tắt
The application of excessive chemical fertilizers during the cultivation of Astragalus membranaceus leads to a decline in the quality of this medicinal plant as well as the soil’s sustainable productivity. In this study, we developed a special microbial organic fertilizer for A. membranaceus and investigated its effects on plant growth and rhizosphere microbial communities. The root biomass and main active components of A. membranaceus in different growth stages were measured to assess the impacts of microbial organic manure on plant growth. Meanwhile, 16S rRNA and ITS1 amplicons were amplified and high-throughput sequencing was performed to detect the dynamic impacts of microbial organic manure on rhizosphere microbial communities. The results demonstrated that microbial organic manure significantly increased wet and dry weights of A. membranaceus seedlings and the accumulation of two effective components (flavonoids and saponin) in bacterial fertilizer treatment groups are significant higher than the control group. Research on rhizosphere microbial flora shows that the number and polymorphism of bacteria and fungi were decreased after the application of special fertilizer during the rapid growth period of plant and then gradually increased with seedling growth. The community structure of bacteria was regulated after the application of special fertilizer, and the beneficial bacteria for plant growth are enriched. Functional profiles prediction showed that significant shifts in metabolic functions impacting KEGG pathways of the microbial fertilizer treatment groups are related to metabolism and biosynthesis. The results indicate that the microbial organic manure can improve A. membranaceus growth by providing appropriate nutrients and regulating the rhizosphere microbial community which has good potential in ecological cultivation of A. membranaceus.
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