Damping-off disease reduction using actinomycetes that produce antifungal compounds with beneficial traits
Actinomycetes are considered to be the biggest producer of bioactive compounds which are expected to have antifungal activity for controlling many fungi such as Rhizoctonia solani. The objective of this study was to obtain potential soybean rhizosphere actinomycetes as a biocontrol agent for R. s...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Polish Academy of Sciences
2020-08-01
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| Series: | Journal of Plant Protection Research |
| Subjects: | |
| Online Access: | https://doi.org/10.24425/jppr.2020.133318 |
| Summary: | Actinomycetes are considered to be the biggest producer of bioactive compounds which
are expected to have antifungal activity for controlling many fungi such as Rhizoctonia
solani. The objective of this study was to obtain potential soybean rhizosphere actinomycetes
as a biocontrol agent for R. solani which cause damping-off disease both in vitro and in
vivo, including their ability to produce siderophore, chitinase, and HCN. Out of 26 isolates,
18 (56%) showed diverse antifungal activities against R. solani with percentages of inhibition
radial growth (PIRG) from 18.9 to 64.8%, as evaluated by a dual culture method. Ten
isolates with the strongest antifungal activity were numbered for further characterization.
All the tested isolates were not antagonistic towards Bradyrhizobium japonicum. These isolates
were able to suppress damping-off disease caused by R. solani in the greenhouse experiment.
Isolate ASR53 showed the highest disease suppression, 68% and 91% in sterile and
non-sterile soil, respectively. Based on 16S rRNA sequence analysis this isolate belonged
to Streptomyces violaceorubidus LMG 20319 (similarity 98.8%) according to GenBank
data base available at www.ncbi.nlm.gov.nih. Furthermore, isolate ASR53 had significantly
longer roots and shoots, as well as greater fresh and dry weights of seedlings than the control.
Crude extract derived from ASR53 isolates contained 10 dominant compounds that
were biologically active against fungal pathogens. Thus, this study suggests that the application
of potential actinomycetes of the soybean rhizosphere can act as a promising biocontrol
agent against damping-off disease caused by R. solani. |
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| ISSN: | 1899-007X 1899-007X |