The effects of three Pseudomonas fluorescens strains on chlorophyll, carotenoid and three nutritional elements in common bean genotypes inoculated with Bean yellow mosaic virus

Bean yellow mosaic virus (BYMV) is one of the most difficult to manage viruses because of having a wide host range and numerous vectors. In this survey the effect of three bacterial strains of Pseudomonas fluorescens, including CHA0, VUPF5 and ΔVUPF5 on BYMV in 16 common bean genotypes has been investigated. Common bean seeds were saturated with suspension of bacterial strains with concentration of 108 cfu/cc before cultivating. The experiment was performed in a completely coincidence model with three replications. Afterwards, all plants except controls were mechanically inoculated with a BYMV isolates. Finally, the concentration of chlorophyll a/b, total chlorophyll, carotenoid and three nutritional elements including Mg, Zn and Fe in common bean genotypes were determined. The results revealed that the mentioned strains could significantly reduce viral damages in most of genotypes. In general, ΔVUPF5 isolate had the best biocontrol effect among three selected bacteria.