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Objetivou-se avaliar a germinacao de sementes de diferentes cultivares de girassol armazenadas sob condicoes de estresse termico. O trabalho foi desenvolvido no Laboratorio de Analise de Sementes do Departamento de Fitotecnia da Universidade Federal do Ceara (UFC), em Fortaleza - CE. Para a avaliacao da influencia da temperatura o experimento foi disposto em delineamento inteiramente casualizado em esquema fatorial (20 x 5), sendo vinte cultivares de girassol e cinco regimes de temperaturas (25,0; 27,5; 30,0; 32,5 e 35,0o C) e, respectivamente, conduzido quatro repeticoes. Foram avaliadas as seguintes variaveis: media da materia fresca por plântula; media da materia seca por plântula tempo medio de germinacao; indice de velocidade de germinacao; porcentagem de germinacao. Os resultados foram comparados entre si pelo teste de Skott-Knott a 5% de probabilidade. A avaliacao de estresse termico promovido nas sementes de girassol, permitiram discriminar o hibrido Olissun como o que apresentou as melhores caracteristicas em termos de qualidade fisiologica para superacao de estresse termico em comparacao aos demais cultivares avaliados.  Germinal aspects of stored sunflower cultivars subjected to heat stress Abstract: This study aimed to evaluate the germination of seeds of different cultivars of sunflower under conditions of heat stress. The study was conducted in the Plant Science Department of the Seed Analysis Laboratory of the Federal University of Ceara (UFC) in Fortaleza-CE. For the evaluation of the influence of temperature, the experiment was arranged in a completely randomized design in a factorial design (20 x 5), and twenty varieties of sunflower five temperature regimes (25.0, 27.5, 30.0, 32.5 and 35,0o C) and, respectively, conducted four replications. The following variables were evaluated: mean fresh weight per plant; average dry matter per plant average time of germination; germination speed index; germination percentage. The results were compared by Skott-Knott test at 5% probability. The evaluation of thermal stress caused in sunflower seeds, allowed to discriminate the hybrid Olissun as the one with the best characteristics in terms of physiological quality to overcome heat stress compared to other cultivars evaluated.

Aspectos germinativos de cultivares de girassol armazenadas submetidos a estresse térmico