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

abstract

  • Sclerotium rolfsii Sacc. is a destructive soilborne fungal pathogen with a wide host range that includes peanuts. Biologicalcontrol offers an interesting alternative to fungicides for sustainable management of soilborne diseases. The currentinvestigation is aimed at evaluating one potential biocontrol agent Streptomyces sp. RP1A-12 for growth promotion and themanagement of peanut stem rot disease caused by S. rolfsii under field conditions. Preliminary studies conducted under invitro and greenhouse conditions showed promising results against the stem rot pathogen. Further in vitro and pot experimentsconducted to assess Streptomyces sp. RP1A-12 for its growth promoting abilities using whole organisms have shown anincrease in seed germination, root and shoot length. Other parameters like nodule number and plant biomass were alsosignificantly increased over control treatments indicating that the test bioagent possesses growth promoting abilities alongwith disease suppression capabilities. Subsequently field studies were carried out for two consecutive rainy seasons. Thebioagent was applied as whole organism and partially purified crude metabolites. Results indicate the bioagent reducedstem 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 andseverity of stem rot compared to the pathogen inoculated control

publication date

  • 2018
  • 2018