Potencial da microbiolização de sementes com rizobactérias para o controle do mofo branco no feijão.

Abstract

The bean (Phaseolus vulgaris L.) is of economical relevance for the country where its cultivation is largely distributed. However, the cultivation might present a decrease in productivity due to the incidence of white mold caused by Sclerotinia sclerotiorum. Considering that, this study aimed at evaluating the potential of isolated bacteria previously selected for the biocontrol of different diseases of beans for white mold control. For that purpose, seeds cultivar BRsValente were microbiolized with distinct bacterial treatments and the effect of microbiolization was assessed through bioassays with detached leaves, as well as in plant assay. Trials were carried out in lab and greenhouse conditions. Eight bacterial isolates were used: DFs93; DFs348; DFs513; DFs769; DFs831; DFs842; DFs843 and DFs912, evaluated either individually or in combinations. Isolated bacterial showed potential control for the white mold through microbiolization of bean seeds. The use of combination C03 and of DFs831, DFs842 and DFs912 resulted in efficient control in some aspects evaluated by reducing the severity of white mold. In vitro evaluations showed that the bacterial isolates produce not only hydrolytic enzymes involved in the biocontrol, but also ammonia and siderophores, indicating for the potential of those isolates to act through different modes of action. Finally, this paper explains at least in part, the biocontrol ability and the potential of these bacterial treatments.