Germinação de sementes de Oenocarpus Mart. : Efeito do dessecamento em sementes de Oenocarpus bacaba Mart. e da temperatura em sementes de Oenocarpus bataua Mart.
Oenocarpus bacaba Mart. and Oenocarpus bataua Mart. are native palm trees from Amazon region, and it is used for fruit pulp and seed oil production.Both species occur in terra firme forest, O. bacaba preferably on the plateau and O. bataua in the lowland forest. These species seeds that do not toler...
| Autor principal: | Bastos, Lydiane Lucia de Sousa |
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| Grau: | Dissertação |
| Idioma: | por |
| Publicado em: |
Instituto Nacional de Pesquisas da Amazônia - INPA
2020
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| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/5027 http://lattes.cnpq.br/4852112671238132 |
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Oenocarpus bacaba Mart. and Oenocarpus bataua Mart. are native palm trees from Amazon region, and it is used for fruit pulp and seed oil production.Both species occur in terra firme forest, O. bacaba preferably on the plateau and O. bataua in the lowland forest. These species seeds that do not tolerate desiccation do the propagation of these species. The objective of this study was to evaluate seed germination under the influence of two environmental factors: the water in O. bacaba seeds and the temperature in O. bataua seeds. In the desiccation study of O. bacaba seeds, shoot development was scored under nursery conditions, comparing ten different seed moisture contents between 40 - 5%. The freshly processed seeds, dried by using forced air, in four hours to 41% and o 39% seed moisture content, respectively, had the highest germination rates, thus the latter can be considered the safety limit of moisture content. The critical limit of water content was between 36,7 to 34,2 %, depending on the germination criteria, in which germinability was reduced by 50%. The lethal water content was ≤26% when germinability was lost. With the advancement of development sensitivity to desiccation increased, and the formation of the 1st sheath was less sensitive to desiccation than the expansion of the eophylls. The temperature effect was tested in O. bataua seeds with eight constant temperatures (between 5 and 40 ° C) and two alternating temperatures (12-hour cycles at 20/30 and 15/35 °C). In evaluating the effect of temperature on the germination of O. bataua, the formation of the germinal button was observed between 10 and 40 °C, however, with advancement in development of the seedlings, it was observed that it became more sensitive to thermal stress, and the temperature range for germination became increasingly narrow. For all germination criteria observed until the formation of the 2nd sheath, constant temperatures of 25 to 30 °C resulted in highest germination percentage in the shortest time, these thermal conditions can be recommended to assess the quality of O. bataua seeds. |