Mecanismos de controle da murcha-de-esclerócio e promoção de crescimento em tomateiro mediados por rizobatérias

• Ano de defesa: 2010
• Autor(a) principal: Pelzer, Gabriela Queiroz
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Roraima; Brasil; PRPPG - Pró-reitoria de Pesquisa e Pós-Graduação; POSAGRO - Programa de Pós-Graduação em Agronomia; UFRR
• Palavras-chave em Português: Sclerotium rolfsii; Antibiose; Sideróforos; Controle biológico; Solanum lycopersicum; Auxinas; Fixação biológica de nitrogênio; Antibiosis; Siderophores; Biological control; Auxins; Biological nitrogen fixation; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA
• Link de acesso: http://repositorio.ufrr.br:8080/jspui/handle/prefix/562

This research was aiming to elucidate the antagonism mechanisms responsible for the biocontrol of southern blight and the elements involved in growth promotion in tomato by rhizobacteria. The experimental assays were performed in vivo and in vitro, and the following characteristics evaluated: production of lytic enzymes, antibiosis by volatiles and diffusible compounds, root colonization, siderophores production, carbon sources metabolism, indole acetic acid production, nitrogen fixation, calcium phosphate solubilization and tomato growth promotion in greenhouse conditions. The results indicate that iron competition and antibiosis are mechanisms that explain the biocontrol capability of southern blight by rhizobacteria just as auxin production and biological nitrogen fixation in growth promotion. Limitations in biological control are demonstrated because the competition capability is strain-specific for Sclerotium rolfsii as well antibiosis for nutritional composition of growth media.