Physiological quality of seeds of citrus during cooling conditions storage/ Qualidade fisiologica de sementes de citros durante o armazenamento em ambiente refrigerado

Aimed to evaluate the effect of storage on emergence and force of the rootstocks Citradia 1708, Citrandarin 1710, Citrange Carrizo, Rangpur lime, Trifoliata Limeira, Rangpur x Swingle 1707 seeds stored in High density polyethylene (HDPE) at 5-7°C and relative humidity of 70% for 210 days. The emergence, emergence speed index and seed moisture content were performed each 30 days. The experimental design was a completely randomized design with four replications. The storage in that conditions cited showed that the seeds of Rangpur with moisture content inferior to 9%o still showed 66.94% and 2.03 for germination and IVE, respectively. For the maintenance of the viability of seeds of the rootstocks Citradia 1708, Citrandarin 1710, Citrange Carrizo, Rangpur x Swingle 1707, moisture content could be kept between 35-40%. Seed viability of the rootstocks Rangpur x Swingle 1707, Citradia 1708 and Citrange Carrizo was maintained for until 150 days. Key words: rootstock, germination, emergence and viability. Objetivou-se avaliar o efeito do armazenamento sobre a viabilidade das sementes dos porta-enxertos Citradia 1708, Citrandarin 1710, Citrange Carrizo, limoeiro Cravo, Trifoliata Limeira, Rangpur x Swingle 1707 armazenadas em sacolas de polietileno de alta densidade (PEAD) sobre temperatura controlada de 5-7°C e umidade relativa do ar de 70% por 210 dias. Inicialmente e a cada 30 dias foram avaliadas a emergencia, indice de velocidade de emergencia e o grau de umidade das sementes. O delineamento experimental utilizado foi o inteiramente casualizado, com quatro repeticoes. Nas condicoes de armazenamento utilizadas, as sementes do limoeiro Cravo com umidade de 8,03% ainda conservaram o poder germinativo em 67%, mas, para a manutencao da viabilidade de sementes de Citradia 1708, Citrandarin 1710, Citrange Carrizo, Rangpur x Swingle 1707, o grau de umidade deve estar entre 30-40%. A viabilidade das sementes dos porta-enxertos Rangpur x Swingle 1707, Citradia 1708' e Citrange Carrizo se mantem por ate 150 dias. Palavras-chave: porta-enxerto, germinacao, emergencia e viabilidade.