Seleção de rizobactérias para o controle biológico da murcha bacteriana do eucalipto

• Autor(a) principal: Santiago, Thais Ribeiro
• Data de Publicação: 2010
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/4402
• topic: Antagonista; Bactéria; Rizobactéria; Eucalipto; Antagonist; Rhizobacteria; Bacteria; Eucalyptus; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOSSANIDADE::FITOPATOLOGIA

The antagonistic potential of 298 rhizobacteria obtained from the rhizosphere and the rhizoplane of tomato and eucalyptus plants was investigated against Ralstonia solanacearum. Several tests were performed using tomato plants for the selection of efficient rhizobacteria. Different methods of application of the antagonists and of inoculation of the pathogen were assessed: 1) seedlings originated from seeds that were microbiolized by soaking for 12 h in a suspension of the antagonist propagules had their roots immersed in the pathogen inoculum suspension; 2) seedlings originated from microbiolized seeds were transplanted to soil infested with R. solanacearum; and 3)immersion of roots in a suspension of propagules of the antagonist and later immersed in a suspension of R. solanacearum. Nine isolates (UFV-11, 32, 40, 56, 62, 101, 170, 229, and 270) were selected as potential antagonists to R. solanacearum, as they suppressed bacterial wilt in at least one of the methods assessed. The promising isolates had their antagonistic potentialities against two isolates of R. solanacearum tested in vitro and in vivo using inoculated eucalyptus plants. Isolates UFV-56 and UFV-62 suppressed bacterial wilt in eucalyptus by 50 to 100%.