Streptomyces sp. RP1A-12 mediated control of peanut stem rot caused by Sclerotium rolfsii

Jacob, S and Sajjalaguddam, R R and Sudini, H (2018) Streptomyces sp. RP1A-12 mediated control of peanut stem rot caused by Sclerotium rolfsii. Journal of Integrative Agriculture (TSI), 17. pp. 1-9. ISSN 2095-3119

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Sclerotium rolfsii Sacc. is a destructive soilborne fungal pathogen with a wide host range that includes peanuts. Biological control offers an interesting alternative to fungicides for sustainable management of soilborne diseases. The current investigation is aimed at evaluating one potential biocontrol agent Streptomyces sp. RP1A-12 for growth promotion and the management of peanut stem rot disease caused by S. rolfsii under field conditions. Preliminary studies conducted under in vitro and greenhouse conditions showed promising results against the stem rot pathogen. Further in vitro and pot experiments conducted to assess Streptomyces sp. RP1A-12 for its growth promoting abilities using whole organisms have shown an increase in seed germination, root and shoot length. Other parameters like nodule number and plant biomass were also significantly increased over control treatments indicating that the test bioagent possesses growth promoting abilities along with disease suppression capabilities. Subsequently field studies were carried out for two consecutive rainy seasons. The bioagent was applied as whole organism and partially purified crude metabolites. Results indicate the bioagent reduced stem rot disease incidence by 64–67% and 22–49% respectively in two field trials conducted with notable increase in yield. Partially purified Streptomyces sp. RP1A-12 metabolites exhibited an even greater effect in reducing the incidence and severity of stem rot compared to the pathogen inoculated control.

Item Type: Article
Divisions: Research Program : Asia
Uncontrolled Keywords: peanut, stem rot, Sclerotium rolfsii, Streptomyces sp., crude metabolites
Subjects: Mandate crops > Groundnut
Others > Plant Pathology
Depositing User: Mr Ramesh K
Date Deposited: 28 Dec 2017 05:43
Last Modified: 19 Dec 2018 10:25
Official URL:
Funders: Biotechnology Industry Research Assistance Council (BIRAC), A Government of India Enterprise
Acknowledgement: The authors are thankful to Biotechnology Industry Research Assistance Council (BIRAC), A Government of India Enterprise, for providing financial support under Biotechnology Industry Partnership Programme (BIPP) (BT/BIPP0429/11/10). The authors are also thankful to Sri Biotech Laboratories India Pvt. Ltd., Hyderabad, India for their collaboration on this project and to Dr. K. Vijay Krishna Kumar (Acharya NG Ranga Agricultural University, Andhra Pradesh, India) for his critical inputs while preparing the manuscript.
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