Quinoline derivatives producing Pseudomonas aeruginosa H6 as an efficient bioherbicide for weed management

Regular application of weedicides has led to multiple toxic effects on human health, environment, and food safety which also facilitated an emergence of weed resistance. Development of bioherbicides using microorganisms has attained considerable attention nowadays for weed management in agricultural fields. In the present study, a rhizospheric bacteria, H6, showing a weedicide efficacy was discovered from the rhizosphere of Momordica charantia. By classical methods and 16S ribosomal DNA phylogenesis, H6 was identified as Pseudomonas aeruginosa. The weedicidal prospective of the secondary metabolites bred by H6 was investigated. Broth, supernatant culture and crude extract of H6 showed high inhibition activity in Pennisetum purpureum, Oryza sativa, Pisum sativa, and Amaranthus spinosum. In general, germination inhibitions of selected weeds were shown by metabolites of the strain H-6. Metabolite identified from strain H6 shows the presence of antifungal and herbicidal compounds. The herbicidal metabolites produced by Pseudomonas aeruginosa H6, was determined by GC- MS analysis. The results revealed that quinoline derivatives which are highly toxic to the target weeds were the distinctive metabolite found within Pseudomonas aeruginosa H6, making it a potential bioherbicide against weed growth. Hence, the results of the present investigation suggest that Pseudomonas aeruginosa H6 can be a suitable alternative to agrochemicals for weed management.