Interação de fatores bióticos e abióticos na ocorrência de Damping-off em milho e feijoeiro

Detalhes bibliográficos
Ano de defesa: 2009
Autor(a) principal: Gomes, Delineide Pereira [UNESP]
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Estadual Paulista (Unesp)
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: http://hdl.handle.net/11449/96807
Resumo: The objective of the research was to determine the influence of biotic and abiotic factors on the occurrence of damping-off of pre and post - emergence, and others problems to the seeds and seedlings, when the sowing of corn and bean. They chose two plots of corn and bean, growing season 2007/2008, from the cultivars Carioca and D 766 respectively, according to his distinction in high and low vigour, low fungi incidence and absence of Rhizoctonia solani. Disinfested seeds were infected with the fungus in culture medium without BDA and water restriction (mannitol, -1.0 MPa). In control treatments was the same growing medium, but without the presence of the fungus. For each treatment the seeds were superimposed in culture media for 36 hours for the corn and bean for 20 hours. For the direct addition of the fungus in soil, we used the technique of sterile sorghum seeds. The experiment was conducted in two different seasons (hot and cold). For two growing seasons the plots were established in plastic pots (capacity 4.5 L) containing sterilized soil prepared according to the randomization of treatments in a greenhouse. The treatments were made from three water availability in the soil contained in vase (30 %, 50 % and 70 % retention of water), two levels of vigour of the seed (high and low vigour) with and without inoculation of Rhizoctonia solani by of inoculation in the seed of the host and soil addition with sterile sorghum seeds. Were four replicates, each containing two vessels, totaling eight pots for each treatment. Twenty days after inoculation, for the cold season, and fifteen days for the hot season was to assess the severity, damping-off of pre and post-emergence, seedling length, dry matter weight and percentage of seedlings healthy.