Análises microscópicas e bioquímicas da resistência do arroz à queima das bainhas mediada pelo silício

• Ano de defesa: 2010
• Autor(a) principal: Schurt, Daniel Augusto
• Orientador(a): Rodrigues, Fabrício de ávila
• Banca de defesa: Silva, Ivanete Tonole da , Soares, Plínio Cesar , Fernandes, Sergio Antônio
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Doutorado em Fitopatologia
• Departamento: Etiologia; Epidemiologia; Controle
• País: BR
• Palavras-chave em Português: Silício; Resistência; Microscopia; Atividade enzimática
• Palavras-chave em Inglês: Silicon; Resistance; Microscopy; Enzymatic activity
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOSSANIDADE::FITOPATOLOGIA
• Link de acesso: http://locus.ufv.br/handle/123456789/1057

The effect of different products, some considered to be efficient inducers of resistance, the sheaths of two cultivars of rice aimed at reducing the length of lesions on the sheath blight. The findings indicated that only the Derosal, Ethephon and potassium phosphite were effective in reducing the length of the lesion on the sheath blight. The two products based on silicon as well as acibenzolar-S-methyl and chitosan deacetylated not reduced the relative length of the lesion of the disease. To measure the physical resistance of the sheaths of rice plants, supplied or not with Si, to infection by R. solani method was used to puncture. The resistance of the sheaths of rice plants to the sheath blight of the sheaths is due in part to greater physical resistance caused by the deposition of Si Upon investigation, the microscopic level, resistance to rice sheath blight enhanced by Si there A minor superficial hyphal growth of R. solani on rice sheaths, smaller necrotic area and higher autofluorescence intensity in transverse sections of sheaths of rice. Through analysis of pyrolysis, elucidated the effect of Si on the possible change of the chemical composition of lignin sheath of rice plants when infected by R. solani. Sheaths in infected plants of both cultivars, or not supplied with Si, there was an increase in S/G, except for BR-Irga-409 supplied with Si By analyzing the effect of Si in the concentration of sugars and insoluble and soluble lignin in sheaths of rice plants infected by the fungus R. solani, there was an increase in lignification of the tissues and reducing sugars.