Screening and Evaluation of Actinomycetes B-35 from Rhizosphere of <i>Salvia miltiorrhiza</i> Bunge and Its Biocontrol and Growth-Promoting Effects
<i>Salvia miltiorrhiza</i> Bunge (<i>S. miltiorrhiza)</i> is one of the most commonly used bulk herbs in China; however, root rot can seriously affect its quality and yields. To minimize the use of chemical pesticides for managing this plant fungal disease, biological control...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-01-01
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| Series: | Agronomy |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2073-4395/15/1/102 |
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| Summary: | <i>Salvia miltiorrhiza</i> Bunge (<i>S. miltiorrhiza)</i> is one of the most commonly used bulk herbs in China; however, root rot can seriously affect its quality and yields. To minimize the use of chemical pesticides for managing this plant fungal disease, biological control utilizing microbial bio-pesticides offers a promising alternative. This study aimed to enhance the biocontrol resources available for combating <i>S. miltiorrhiza</i> root rot by isolating actinomycetes with antifungal activity from the rhizosphere soil of <i>S. miltiorrhiza</i> and identifying biocontrol actinomycetes with a preventive effect on root rot. A total of 35 actinomycetes were successfully screened from the rhizosphere soil of <i>S. miltiorrhizae.</i> The strain B-35 with the strongest antifungal activity was screened out through antagonizing the pathogen <i>Fusarium solani</i> of <i>S. miltiorrhiza</i>, strain morphology and 16S rRNA analysis. The antagonistic actinomycetes fermentation filtrate and crude extract could significantly destroy the mycelium and spores of <i>Fusarium solani</i>; the biocontrol effect of mature <i>S. miltiorrhiza</i> rhizome reached 83.3%, and the number of leaves, plant height and biomass in the B-35 treatment group were significantly increased compared with the control group. B-35 has a certain application potential in the biological control of root rot and the promotion of <i>S. miltiorrhizae</i>. The antifungal activity of actinomycetes sourced from the rhizosphere soil of <i>S. miltiorrhiza</i> has been demonstrated for the first time, potentially enhancing future crop quality and production. |
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| ISSN: | 2073-4395 |