Isolating Culturedrhizosphere Microorganisms and Assessment of Possible Biocontrolling Effect On Two Ground Pathogens
The study was made taking 12 samples from rhizosphere and seeding them by duplicate in solids average, agar dextrose potatoe, agar Bengal Rose, (with and without antibiotic), agar yeast mold and agar Luria Bertani. 8 morphotypes of leavenings, 5 morphotypes of bacteria and 9 morphotypes of moulds were isolated; most of them demonstrated antagonism in vitro with the selected phytopathogens. This study allows us to conclude that in the rhizosphere of the plant O. umbellatum are microorganisms that demonstrated antagonism in vitro and that they could be used like biocontrolers of Botrytis cinerea and Sclerotinia sclerotiorum. In addition, it was observed that some of the isolated microbial morphotypes displayed a very discreet antagonism, but they caused changes in the structure and color of hyphae of the used phythopatogens fungi. It leads us to think that the concentration of the biocontroler influences the mechanisms of biocontrol.