Contributo para a caracterização das sementes das espécies endémicas lenhosas dos Açores: Picconia azorica, Prunus azorica, Juniperus brevifolia e Vaccinium cylindraceum
2014
Silva, Elsa Susana de Sousa Dimas | Almeida, Maria Helena Ribeiro
Mestrado em Engenharia Florestal e dos Recursos Naturais - Instituto Superior de Agronomia
Mostrar más [+] Menos [-]The present work was organized into two sections: the first one assemble all existing information regarding the characterization of four endemic species of the Azores and their propagation techniques; the second presents the results obtained in 2007 and 2012 / 2013 concerning the morphological characterization of the batch of fruit and seeds of these species and their physiological characterization, regarding seed lots’ viability and its germination capacity. It was also tested some techniques to break seed dormancy, having obtained the following results: 1) The removal of the seed coat form the Picconia azorica is enough to induce improvements in their germination rates; 2) In Prunus azorica the germination rates were zero, but the removal of the seed coat may be a methodology to apply in the future; 3) The best germination rates for Juniperus brevifolia where obtained after applying a chemical scarification with H2SO4, for 45 minutes, followed by a cold stratification for 60 days; 4) The seeds of Vaccinium cylindraceum easily lose their ability to germinate due to the moisture reduction and should be sown soon after harvested
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