Resumen de Ação da giberelina em sementes pré-embebidas de mamoneira

Clovis Pereira Peixoto, Franklim de Jesus Soares Sales, Elvis Lima Vieira, Adriana Rodrigues Passos, Jamile Maria da Silva dos Santos

• English

  A experiment was conducted in the Universidade Federal do Roconcavo da Bahia (UFRB), under greenhouse conditions, with the purpose of verify the action of liquid giberelin over the emergency of castor bean seedlings. Castor bean seeds from BRS 188 Paraguacu cultivar were submerged for 3 hours in a solution of giberelic acid (GA3) on concentrations zero, 50, 100 and 150 �ÊL L-1 and then planted in plastic trays, containing washed sand. An entirely random alignment was used with five treatments and five repetitions. Each experimental unit was formed by a tray, where were planted 25 seeds. The number of emerged seeds was daily registered. On the fifth day the percentage of emergency was calculated, and on the thirtieth day it was evaluated the measurement from the root to the aerial parts. The dry mass was, also, evaluated after three days in the greenhouse with artificial ventilation under 65 ��C. The conclusion is that the gibberelin on the dose of 100 �ÊL L-1 is the best treatment to the percentage of the first counting, index of emergency speed, emergency, length and dry mass of the root and aerial parts of castor beans plants.

• português

  Um experimento em condicoes de casa-de-vegetacao foi conduzido no Centro de Ciencias Agrarias da Universidade Federal do Reconcavo da Bahia (UFRB), com o objetivo de verificar a acao da pre-embebicao de sementes em giberelina liquida sobre a emergencia de plantulas de mamoneira. Sementes de mamona da cultivar BRS 188 Paraguacu foram imersas por 3h em solucoes de acido giberelico (AG3) nas concentracoes zero, 50, 100 e 150 �ÊL L-1, em seguida foram semeadas em bandejas plasticas contendo areia lavada. Utilizou-se o delineamento inteiramente casualizado com cinco tratamentos e quatro repeticoes. Cada unidade experimental constou de 25 sementes por bandeja. Diariamente registrou-se o numero de sementes emergidas. Aos cinco dias calculou-se o percentual de emergencia e aos 30 dias avaliou-se o comprimento de raiz, parte aerea e massa seca das plantulas. Avaliou-se, tambem, a materia seca das plantulas apos tres dias em estufa com ventilacao forcada a 65��C. O uso da giberelina na dose de 100 �ÊL L-1 melhora o percentual de primeira contagem, indice de velocidade de emergencia, emergencia, comprimento e massa seca de raiz e parte aerea das plantulas de mamona.