Microbiolização de sementes de feijoeiro para biocontrole de crestamento bacteriano comum

Abstract

Brazil is the third largest producer of beans in the world and diseases are the main biotic factors that reduce crop yield. The bacterium Xanthomonas axonopodis pv. phaseoli (Xap) causing the common bacterial blight (CBB) of difficult control is one of the main diseases that affect the culture of the bean. Biological control of diseases using beneficial microorganisms is an alternative that has been studied in recent years, mainly for the search for more sustainable methods and less harmful to the environment. Therefore, the objective of this work is to evaluate the microbiolization of bean seeds with bacteria with potential for the biocontrol of diseases of the bean culture, in the induction of resistance. For this, the IPR Tuiuiu cultivar beans were microbiolized for 5 hours with the isolates: 16, 27, 34, 49, 82, 114 and RD34, sown in pots and kept in greenhouse. In assay 1 Xap inoculation was performed on the third true leaf fully developed by the scissors incision method immersed in suspension. In assay 2 the plants were inoculated with Xap by the spraying method on expanded flowers. The seeds harvested were evaluated for the transmission of the pathogen. Seed treatment with the bacterial isolates had satisfactory responses in the present study in which isolate 114 significantly reduced disease severity and positively affected seedling development resulting in a lower incidence of BCC symptoms.