Biological Control of Pythium aphanidermatum, the Causal Agent of Tomato Root Rot by Two Streptomyces Root Symbionts
نویسندگان
چکیده
Damping-off caused by Pythium aphanidermatum, as one of the most infamous plant diseases, is considered a significant disease that causes severe damages in greenhouse and field crops vast range hosts especially vegetables. The application chemical fungicides common method to control this poses negative side effects on humans environmental components. Actinobacteria, members genus Streptomyces, are fascinating biocontrol agents growth-promoting rhizobacteria, which exhibit safer alternative managements disease. present study aims explore for bioactives soil Streptomyces isolates able P. causal agent damping-off tomato. Out total 116 actinobacteria collected from soil, 53 have showed an antagonistic activity against deduced through vitro dual cultures. Based Petri plate seedling-bioassays (IPSB), tested cultures, two coded H2 H3, bioactive agents, were selected assess their performances aphanidermatum Sandwich bed-mix technique experiments. In vivo statistical studies performed compare seven treatments using completely randomized design Metalaxyl fungicide was applied chemical-control treatment. To evaluate efficiencies symbionts, incidence recorded throughout course experiment criteria number leaves, length plants, fresh dry weights, measured at end analyzed statistically. resulted incidences all indicated strains had PGPR activity, they effective decreasing improving regarding height, weights. phylogenetic analysis partial sequences 16S rRNA gene, strain revealed close relation six species, namely S. badius, caviscabies, globisporus, parvus, sindenensis, griseoplanus, with 99.9% similarity. H3 also same similarity flavogriseus pratensis. overall, data dictated root symbiont effectively controlled aphanidermatum.
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ژورنال
عنوان ژورنال: Agronomy
سال: 2021
ISSN: ['2156-3276', '0065-4663']
DOI: https://doi.org/10.3390/agronomy11050846