Evaluation on the efficiency and persistence of Streptomyces jietaisiensis strain A034 in controlling root knot disease and promoting plant growth in the plant-parasitic nematode infested soils

• Published in: Biological control 2020-05, Vol.144, p.104221, Article 104221
• Main Authors: Ruanpanun, Pornthip, Nimnoi, Pongrawee
• Format: Article
• Language: English
• Subjects: Biocontrol; Meloidogyne; Root knot nematodes; Streptomyces
• ISSN: 1049-9644
• DOI: 10.1016/j.biocontrol.2020.104221

•First report of S. jietaisiensis to prevent root knot disease and promote plant growth.•S. jietaisiensis was capable of surviving throughout the entire of a cultivation period.•S. jietaisiensis sustains soil bacterial community. The effects of Streptomyces jietaisiensis strain A034 on biocontrol of root knot disease in chili were assessed. The impact of the strain on soil bacterial community and the establishment of the strain after being introduced into the root knot nematode (RKN) infested soils were also investigated. The strain significantly reduced numbers of egg masses by 2.70 to 10.67-fold and decreased numbers of J2 of Meloidogyne incognita in the RKN infested soils by 27.79% to 33.85%. The highest control efficiency of the strain was recorded when inoculated its spores in the vicinity of chili roots before nematode invasion. The strain significantly increased biomass, shoot and root length by 53.44%, 10.24% and 100%, respectively. Inoculation of the strain significantly increased plant elements including total N, P, K, Ca, Mg and Fe (38.01%, 8.80%, 17.90%, 44.28%, 48.22% and 62.84%, respectively). DNA-based analysis revealed that the strain was capable of surviving and proliferating in the RKN infested soils throughout a cultivation period as well as friendly to microbial community. This is the first report demonstrating the potential of S. jietaisiensis to prevent root knot disease and promote plant growth.