Submitted by Ricardo Cedraz Duque Moliterno (ricardo.moliterno@uefs.br) on 2017-07-12T01:06:09Z No. of bitstreams: 1 TESE VERS?O FINAL MARCELO ARAUJO (1).pdf: 2342837 bytes, checksum: 363174d9d071939d3ad3c4f66b795b8a (MD5) / Made available in DSpace on 2017-07-12T01:06:09Z (GMT). No. of bitstreams: 1 TESE VERS?O FINAL MARCELO ARAUJO (1).pdf: 2342837 bytes, checksum: 363174d9d071939d3ad3c4f66b795b8a (MD5) Previous issue date: 2017-02-10 / Funda??o de Amparo ? Pesquisa do Estado da Bahia - FAPEB / Amburana cearensis (Allem?o) A.C.Sm. is native tree of Brazil adapted at semi-arid habitats. It has ecological, commercial and medicinal importance. A. cearensis is listed in the red list of endangered species. It is threatened by habitat loss and exploitation for use in folk medicine. The bark is used, in the traditional medicine, to cure respiratory diseases while seeds are used to treat lung diseases. This work aims to study the physiological aspects of germination and storage of Amburana cearensis (Allem?o) A.C.Sm. seeds. Four storage conditions were used and assessed during 27 months: airtight container in refrigerator; airtight container in laboratory, paper bags in laboratory and liquid nitrogen during 24 months. Germination test was performed at temperatures of 15, 20, 30, 35, 40 and 45 ?C with a photoperiod of 12 hours. Germination in salt solutions was used salt concentration of 100, 200, 300, 400 and 500 mM. A. cearensis seeds kept in refrigerated environment maintain the viability for at least two years. The ideal temperature in seed germination of A. cearensis is 38 ?C. Accessions differed in seed dry mass, in time until 50% imbibition (IMt50), and time until radicle protrusion (RP). The start of water uptake (TWU) was delayed by more than 4 d despite optimal contact between the seed surface and water, and this delay was stronger for smaller seeds and differed between accessions. Longer delay of imbibition was also correlated with higher optimum temperature for germination rate (To), and with longer time until radicle protrusion in water. The TWU, IMt50, and the RP differed between water and salt treatments for the accessions from the semi-arid habitat. These results suggest that it is not advisable to store A. cearensis seeds in laboratory environment without an airtight container and the delayed of the water uptake forms an adaptation to an environment with high temperature, low precipitation, and saline soils, most likely to spread the risk of completing germination at the start of the rainy season. / Amburana cearensis (Allem?o) A.C.Sm. ? uma ?rvore nativa do Brasil adaptada a habitats semi?ridos. Tem import?ncia ecol?gica, comercial e medicinal. A. cearensis est? inserida na lista vermelha de esp?cies amea?adas de extin??o. ? amea?ada por perda do habitat e explora??o para o uso na medicina popular. A casca ? utilizada, na medicina tradicional, para curar doen?as respirat?rias enquanto as sementes s?o usadas para tratar doen?as pulmonares. Este trabalho tem como objetivo estudar os aspectos fisiol?gicos da germina??o de sementes de Amburana cearensis. Foram utilizadas quatro condi??es de armazenamento e avaliados durante 27 meses: recipiente herm?tico em geladeira; recipiente herm?tico em laborat?rio; sacos de papel em laborat?rio e nitrog?nio l?quido. O teste de germina??o foi realizado em temperaturas de 15, 20, 30, 35, 40 e 45 ?C com fotoper?odo de 12 horas. Para germina??o em solu??es salinas foi utilizada concentra??o de 100, 200, 300, 400 e 500 mM. As sementes de A. cearensis mantidas em ambiente refrigerado mantiveram a viabilidade durante pelo menos dois anos. A temperatura ideal na germina??o de sementes de A. cearensis ? de 38 ?C. Os acessos diferiram entre si na massa seca da semente, no tempo at? 50% de imbibi??o (IMt50) e de protrus?o da rad?cula (RP). O in?cio da absor??o de ?gua (TWU) foi atrasado em mais de 4 d, apesar do ?timo contato entre a superf?cie da semente e a ?gua, e este atraso foi mais forte para as sementes menores diferindo entre os acessos. O atraso maior da embebi??o tamb?m foi correlacionado com uma temperatura ?tima mais alta para taxa de germina??o (To), e com maior tempo at? protrus?o da rad?cula em ?gua. O TWU, o IMt50 e o RP diferiram entre tratamentos de ?gua e sal para as acessos do habitat semi?rido. Estes resultados sugerem que n?o ? aconselh?vel armazenar sementes de A. cearensis em ambiente de laborat?rio sem recipiente herm?tico e o atraso da absor??o de ?gua forma uma adapta??o a um ambiente com alta temperatura, baixa precipita??o e solos salinos, muito provavelmente para espalhar o risco de completar a germina??o no in?cio da esta??o chuvosa.