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Development of new technologies, aiming at increasing productivity in different crops, involves constant research on the effectiveness and application of these techniques in seed treatment. In this study, it was aimed at evaluating physiological potential of rice seeds treated with plant growth-promoting rhizobacteria (PGPR) (strains DFs185, DFs223, DFs306, DFs416), or with two dosages of the insecticide thiamethoxam. The variables assessed were: germination (G); first count of germination (FCG); cold test (CT); length of seedlings aerial parts (LAP), root system (LRS), and total length (TL); emergence speed index (ESI); emergence (E), at 14 days; and dry phytomass (DP). Treatments have had a positive effect on percentage of G, FCG and E. The strain DFs185 has promoted increase in percentage emergence, for five of the six lots assessed. The variables: LAP; LRS; TL; ESI; and DP have undergone low or none influence of treatments; and there has been no toxic effect of rhizobacteria or insecticide thiamethoxam. In the cold test, a negative effect of treatments has been detected. Seed treatment with rhizobacteria, as well as with thiamethoxam, improve quality of low quality rice seeds. The strain DFs185 is promising for treating rice seeds, once it stimulates seed germination and emergence. O desenvolvimento de novas tecnologias, visando o aumento de produtividade em diferentes cultivos, implica em investigações constantes sobre a eficiência e aplicação dessas novas técnicas no tratamento de sementes. O objetivo deste trabalho foi avaliar o potencial fisiológico de sementes de arroz, tratadas com rizobactérias promotoras de crescimento de plantas (RPCP) (estirpes DFs185, DFs223, DFs306 e DFs416) e duas doses do inseticida tiametoxam. As variáveis avaliadas foram: germinação (G); primeira contagem da germinação (PCG); teste de frio (TF); comprimento da parte aérea (CPA), sistema radicular (CPR) e total (CT); índice de velocidade de emergência (IVE); emergência (E) aos 14 dias; e fitomassa seca (FS). Os tratamentos conferiram efeito positivo aos porcentuais de G, PCG, e E. Estirpe DFs185 conferiu aumento do porcentual de emergência para cinco dos seis lotes avaliados. As variáveis CPA, CPR, CT, IVE e FS sofreram pouca ou nenhuma influência dos tratamentos; porém não houve efeito tóxico das rizobactérias e do tiametoxam. No teste de frio foi observado efeito negativo dos tratamentos. O tratamento das sementes com rizobactérias e tiametoxam incrementa o potencial fisiológico de sementes de arroz com baixa qualidade. DFs185 é promissor, para o tratamento de sementes de arroz, por estimular a germinação e emergência

Physiological potential of rice seeds treated with rhizobacteria or the insecticide thiamethoxam