Effects of growth regulators on Poncirus trifoliata x Citrus paradisi seeds germination.

The objective of this research was study the effects of kinetin and gibberellins on Poncirus trifoliata x Citrus paradisi seed germination. The medium for seed germination was filter paper moisted with distilled water. The seeds were removed from ripe fruits, washed, dried and placed in refrigerator at 4-5°C. After that, the seeds were treated with growth regulators during 24 hours. The treatments were H2O; 50 mg/l de GA3; 250 mg/l de GA3, 50 mg/l de GA4 + GA7 + phenylmethylaminepurine; 100 mg/l de GA4 + GA7 + phenylmethylaminepurine; 20 mg/l of phenylmethylaminepurine; 40 mg/l of phenylmethylaminepurine. The evaluations were accomplished every two days starting 10 days after seeding. The GA3 50 or 250 mg/l proved to be most beneficial in enhancing seed germination.
Foram estudados os efeitos de giberelinas e citocininas, na germinação de sementes de citrumelo "Swingle" (Poncirus trifoliata x Citrus paradisi). As sementes foram colocadas no germinador em gerbox contendo papel de filtro umedecido com água destilada. As sementes, retiradas de frutos maduros, foram lavadas, secadas à sombra e armazenadas em câmara fria; logo após, foram tratadas com os fitorreguladores por 24 horas, definindo os seguintes tratamentos: H2O; 50 mg/l de GA3; 250 mg/l de GA3, 50 mg/l de GA4 + GA7 + fenilmetilaminopurina; 100 mg/l de GA4 + GA7 + fenilmetilaminopurina; 20 mg/l de fenilmetilaminopurina e 40 mg/l de fenilmetilaminopurina. As avaliações foram realizadas depois de 10 dias de semeadura, num intervalo de 2 dias entre elas. Através da análise estatística dos resultados obtidos, foi possível concluir que, no tratamento com 50 ou 250 mg/l de GA3, houve a maior porcentagem de germinação de sementes, em menor tempo.