Potencial fisiológico de sementes de arroz tratadas com rizobactérias ou tiametoxam

• Autor(a) principal: Soares, Vanessa Nogueira
• Data de Publicação: 2011
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFPel - Guaiaca
• Texto Completo: http://repositorio.ufpel.edu.br/handle/ri/1502
• topic: Oryza sativa L.; Vigor; Bioativador; RPCPs; Oryza sativa L.; Vigor; Bioactivator; PGPR; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOTECNIA::PRODUCAO E BENEFICIAMENTO DE SEMENTES

The development of new technologies to increase productivity in various crops involves constant research on the effectiveness and implementation of these new techniques for seed treatment. The objective was to evaluate the physiological increase in rice seeds treated with PGPR promote plant growth (DFs185 (Pseudomonas synxantha) DFs223, (P. fluorescens), DFs306 (unidentified), DFs416 (Bacillus sp.) and two levels of thiamethoxam (100mL / L and 200 mL / L of thiamethoxam product per 100kg seed) under ideal conditions for development and stress conditions by low temperatures. Were used six lots of BRS Querência with differences in physiological quality. Two experiments were conducted, in the first the variables were: germination, first count germination, cold test, length of coleoptiles, length of roots, total length, dry weight of roots, coleoptiles dry weight, speed index emergency and emergency for 14 days. In the second experiment were used seeds treated with thiamethoxam, DFs185 (P. synxantha) and without treatment, the variables were: germination, first count germination, germination rate, rate of emergence, emergence to 14 days length of coleoptiles and roots and electrophoretic patterns of isoenzymes α-amylase, esterase and peroxidase, all tests were performed at temperatures of 25, 20 and 15 ° C. Seed treatment with thiamethoxam and rhizobacterial stimulates the physiological quality of seeds of low quality rice. The most influenced by seed treatment with thiamethoxam and the bacterial isolates DFs185 (P. synxantha) DFs223, (P. fluorescens), DFs306 (unidentified), DFs416 (Bacillus sp.) were germination and emergence. The treatments thiamethoxam and P. synxantha (DFs185) did not alter the expression and intensity of expression of esterase and peroxidase isoenzymes. The bacterium P. synxantha (DFs185) is promising for treatment of rice seeds to stimulate germination and emergence. Treatments thiamethoxam and P. synxantha (DFs185) showed not beneficial effect on quality of rice seeds subjected to low temperature stress.