RESUMOO objetivo foi avaliar a germinação e dormência das sementes de U. humidicola cv. Llanero em diferentes concentrações de ácido giberélico e paclobutrazol, utilizando sementes intactas e sementes nuas (cariopses). Utilizou-se diferentes soluções para embebição do substrato. As soluções de ácido giberélico (GA 3 ) foram: 0 (água pura); álcool 5%; 0,50 mM L -1 ; 1,0 mM L -1 ; 2,0 mM L -1 e 4,0 mM L -1 e de paclobutrazol (PBZ): 0; 0,05 g L -1 ; 0,100 g L -1 e 0,200 g L -1 . Avaliou-se a germinação por protrusão de raiz primária, índice de velocidade de germinação e a porcentagem de dormência das sementes. Os dados foram analisados pelo teste F e o teste de Tukey para comparação de médias. O GA 3 favorece a germinação das sementes intactas, porém para a germinação do cariopse não há influência do ácido giberélico. O PBZ não inibe a germinação das sementes nuas. A germinação esta relacionada à outros fatores, além do balanço de giberelinas nas sementes. Palavras-chave: Germinação; Giberelina; Inibidor da giberelina; Triazol; Urochloa. EVALUATION DORMANCY Urochloa humidicola CV. LLANERO UNDER DIFFERENT ACID DOSES GIBBERELLIC AND PACLOBUTRAZOLThe objective was to evaluate the germination and dormancy of U. humidicola seeds cv. Llanero in different concentrations of gibberellic acid and paclobutrazol using intact seeds and naked seeds (caryopses). Different solutions are used for soaking the substrate. The solution of gibberellic acid (GA3) were: 0 (pure water) ; 5% alcohol; 0.50 mM L-1; 1.0 mM L-1; 2.0 mM L-1 and 4.0 mM L-1 and paclobutrazol (PBZ): 0; 0.05 g L-1 ; 0.100 g L-1 and 0.200 g L-1 . We evaluated the germination protrusion of primary root, germination speed index and the percentage of seed dormancy. Data were analyzed by F test and Tukey test to compare means. The GA3 favors the germination of intact seeds, but for the germination of caryopses there is no influence of gibberellic acid. The PBZ does not inhibit the germination of naked seeds. Germination is related to other factors and the balance of gibberellins in the seeds.
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