Made available in DSpace on 2016-04-28T14:58:34Z (GMT). No. of bitstreams: 1 2005- Cristiane Miranda Martins.pdf: 5016347 bytes, checksum: edbb51eb103817d7b3f8ed06497e9daa (MD5) Previous issue date: 2005-02-18 / Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico / The present work was carried out at UFRRJ, in Serop?dica, Rio de Janeiro state, to study the influence of tegument and aril on the germination of seeds from two Passifloraceae species: Passiflora edulis f. flavicarpa Deg. and Passiflora alata Curtis. obtained from whole market fruits pur chased at CEASA-RJ. On the first stage the seeds were evaluated in regard to the physiological and sanitary quality at different substrates and temperatures, as well as to the the process of imbibition and hydric restrition. A three-phase pattern of seed imbibition, was observed, germination decreased from the osmotic potential of -0,6 MPa and increased in sand at the temperature alternating from 20 to 30? C in both species. However, sanitary quality was greatest in fungicide treated seeds with removed aril. The results have pointed out that the seeds from both species presented highest percentage of germination upon aril removal, regardless the seed extremity cutting-off. On the second stage seed extracts were obtained with organic solvents of different polarities. These extracts were identified by classes and a sensibility test was performed with Lactuca sativa L. seeds. Steroids and triglicerides were detected in the dichloromethane extract, carbohydrates were detected in methanol extract. Lettuce seeds germination was inhibited by the dichlorinemethanol extract and increased the members of abnormal seedlings and hard seeds. / O presente trabalho foi realizado na UFRRJ, em Serop?dica, RJ, com a finalidade de estudar a influ?ncia do tegumento e do arilo na germina??o de sementes de duas esp?cies de Passifloraceas, Passiflora edulis f. flavicarpa Deg. e Passiflora alata Curtis., obtidas de frutos oriundos de lotes comerciais, adquiridos no CEASA RJ. Na primeira etapa, as sementes foram avaliadas quanto ? qualidade fisiol?gica e sanit?ria, em diferentes substratos e temperaturas, bem como o processo de embebi??o e de restri??o h?drica, nos quais se constatou o modelo trif?sico de embebi??o das sementes, redu??o da germina??o a partir do potencial 0,6 MPa, melhoria da germina??o em substrato areia e na temperatura alternada de 20-30?C, em ambas as esp?cies. Contudo, a qualidade sanit?ria foi maior nas sementes onde foi aplicado fungicida e onde o arilo havia sido removido. Os resultados indicaram que sementes de ambas as esp?cies apresentaram maior porcentagem de germina??o na aus?ncia do arilo, independente do desponte. Na segunda etapa foram obtidos extratos com solventes org?nicos de diferentes polaridades, identificadas ?s classes de subst?ncias presentes e realizado teste de sensibilidade dos mesmos com sementes de Lactuca sativa L. Foram detectados no extrato obtido com diclorometano triglicer?deos e ester?ides; e carboidratos no extrato metan?lico. O extrato diclorometano inibiu a germina??o de sementes de alface, aumentando o n?mero de pl?ntulas anormais e sementes duras, indicando que as subst?ncias contidas nesse extrato influenciaram o processo germinativo.