Tratamento fotodinâmico de sementes de tomate (Solanum licopersicon MILL.), na inativação da bactéria Xanthomonas spp

Abstract

The tomato crop is a one of the highest expressed cultivation in the world; however, various pests may attack the crop. The bacterial spot, caused by the bacterium Xanthomonas spp., is one of the most important diseases that cause losses in yield and quality of tomato and one of the most effective ways to control the disease currently is the use of pathogen-free seeds. This paper studied a new type of seed treatment, effective in controlling fitobactérias. A study in vitro was performed of the photodynamic activity of the dyes Methylene Blue, Toluidine Blue and a combination of both dyes in various concentrations, containing a suspension of Xanthomonas spp. The tested dyes are able to inhibit bacterial growth effectively, under irradiation conditions and with all concentrations tested. In this work we developed a seed treatment, and the method tested was effective in controlling bacteria without causing damage quality physiological seed, figuring a new type of seed treatment that avoids the use of pesticides.