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portuguesA estimulacao da germinacao das sementes pode ser devida a aceleracao da germinacao, bem como a melhoria do crescimento das mudas durante o desenvolvimento inicial. O hidrolisado de plantas pode ser aplicado como estimulante. Assim, objetivou-se verificar a influencia dos hidrolisados, obtidos por tratamento alcalino ou acido, dos residuos da cultura do tabaco (Nicotiana tabacum L.) (raiz e caule) no processo de germinacao das sementes. A germinacao das sementes foi estudada com Oryza sativa (arroz) e Zea mays (milho). Foram realizados dezesseis experimentos de germinacao de 50 sementes cada, com 4 repeticoes, hidratadas em hidrolisados diluidos a 20 e 80%, em 2 e 3 mL de volumes de hidratacao por 48 h. As sementes germinadas foram contadas, momento em que foram observadas protrusoes radiculares. Radiculas e partes aereas foram coletadas, secas e pesadas. Os hidrolisados apresentaram potencial nutricional de plântulas para o milho, com ~ 50% a mais de massa quando comparados aos resultados com agua nas mesmas condicoes, e a aceleracao da germinacao nao foi significativa. Para as sementes de arroz testadas, os resultados foram contrarios e a aceleracao da germinacao foi significativa com taxas de ate 94% apos 48 h de incubacao. Melhores resultados de germinacao foram obtidos com hidrolisado a partir do tratamento acido, e a raiz ou caule de tabaco pode ser utilizado para esse fim EnglishStimulation of seed germination may be due to acceleration of germination as well as due to seedling growth-promotion during early development. Plant hydrolysate can be applied as a stimulant. Thus, we aimed to verify the influence of the hydrolysates, obtained by alkaline or acid treatment, from tobacco (Nicotiana tabacum L.) crop residues (root and stem) on the seed germination process. Seed germination was studied with Oryza sativa (rice) and Zea mays (corn). Sixteen germination experiments of 50 seeds each were undertaken, with 4 replicates, soaked with hydrolysates diluted at 20 and 80%, in 2 and 3 mL of hydration volumes for 48 h. Germinated seeds were counted, at which point radicular protrusions were observed. Rootlets and aerial parts were collected, dried and weighed. The hydrolysates presented seedling nutrition potential to the corn, with ~50% more mass compared to the results with water at the same conditions, and the germination acceleration was not significant. For the tested rice seeds, the results were reversed, and the germination acceleration was significant with rates up to 94% after 48 h of incubation. Better results of germination were obtained with hydrolysate from acid treatment, and root or stem tobacco can be used for this purpose

Tobacco waste hydrolysate of stem and root of the tobacco plant for biostimulation in rice and corn seed germination