Seca de ponteiros de Eucalyptus spp. causada por Erwinia psidii no Brasil

• Autor(a) principal: Arriel, Daniele Aparecida Alvarenga
• Data de Publicação: 2012
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/4761
• topic: Eucalyptus spp.; Erwinia psidii; Doença; Etiologia; Eucalyptus spp.; Erwinia psidii; Disease; Etiology; CNPQ::CIENCIAS BIOLOGICAS::GENETICA::GENETICA VEGETAL

Since 2009, a new disease has been observed in eucalyptus stands. Of unknown bacterial etiology, it is characterized by die-back, wilting, lesions on branches, petiole and midrib, accompanied by macroscopic and microscopic bacterial ooze. To date, this disease has been observed in stands of clonal hybrids of Eucalyptus urophylla x E. grandis, E. grandis and in seminal plantations of E. dunnii in São Paulo and Rio Grande do Sul. Considering the economic importance of the silviculture of eucalypts and the potential damage caused by the disease, this study aimed to identify and characterize its etiologic agent. Thirteen strains were obtained from materials presenting the symptoms in the field. Inoculation of cuttings and detached leaves proved the pathogenicity of the strains to eucalyptus. Phylogenetic analysis of three housekeeping genes (16S rDNA, gapA, recA and rpoB as well as biochemical tests confirmed the identity of strains as belonging to the species Erwinia psidii. This is the first report of E. psidii causing die-back on Eucalyptus spp. in Brazil.