Bioprospecção de bactérias, isoladas de diferentes sistemas de cultivo, para o controle de patógenos habitantes de solo da cultura do feijão

Abstract

Phaseolus vulgaris common beans are widely cultivated and consumed in Brazil as well as in other countries. It is sensitive to both abiotic, such as temperatures and precipitation conditions and biotic conditions caused by interference by microorganisms, being the biocontrol of phytopathogens a sustainable alternative to the management of diseases in agroecosystems. Thus, rhizoplane and rhizosphere bacteria were isolated from different bean production systems, no-tillage system and conventional, verifying their potential as biocontrol agents for crop-infecting phytopathogens such as Macrophomina phaseolina, Sclerotinia sclereotiorum, and Rhizoctonia solani. For this, antibiotic tests and biocharacterization tests of the selected bacterial isolates were carried out: gelatin, starch and casein hydrolysis test, siderophores production, biosurfactant production, ammonia production, selected isolates motile and volatile compounds production. From the development of this work, six bacterial isolates, RD34, RD27, SD18, RD12, RD10 and RD06, with potential for the biocontrol of plant pathogens that affect the bean culture, were selected and presented the greatest number of mechanisms associated to the biocontrol of diseases studied.