temperatura, luz e substrato para germinação de sementes de pau-brasil (caesalpinia echinata lam., leguminosae - caesalpinioideae) temperature, light and substrate for germination of seeds of brazilwood (caesalpinia echinata lam., leguminosae - caesalpinioideae)
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ID: 252572
2007
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Abstract
Programas de preservação de Caesalpinia echinata, espécie considerada em risco de extinção, incluem a conservação ex situ, que poderia ser ainda mais intensificada pelo armazenamento, no longo prazo, de suas sementes. Embora já se tenha desenvolvido tecnologia suficiente para preservar a germinabilidade dessas sementes por até dois anos, ainda são insuficientes as informações acerca das condições adequadas para a germinação, mormente as referentes a temperatura, luz e substrato. Este trabalho visou avaliar os efeitos de temperaturas constantes de 10 a 45 °C em presença ou ausência de luz e o tipo (papel, areia e vermiculita) e umidade do substrato sobre a germinação das sementes de pau-brasil. Concluiu-se que a semeadura deve ser realizada em rolo de papel, umedecido na relação 1:2,5 a 1:3,0 (substrato:água, em massa), e na temperatura de 25 °C, sem necessidade de luz.
Preservation of the Brazilian endangered tree Caesalpinia echinata Lam. include the ex situ conservation that could be enhanced by the long term storage of its seeds. In despite of having enough technology to preserve brazilwood seed viability for at least two years, there is scarce information on the optimal conditions for germination, mainly concerning temperature, light and substrate. This research aimed to study the effects of the constant temperatures (10 to 45°C), the presence or absence of light and the moisture content of three substrates (paper, sand and vermiculite) on the germination of C. echinata seeds. The results suggested that these seeds should be sowed on paper roll moistened at the ratio 1:2.5 or 1:3.0 (substrate:water, w/w) at 25°C, no need for light.
Preservation of the Brazilian endangered tree Caesalpinia echinata Lam. include the ex situ conservation that could be enhanced by the long term storage of its seeds. In despite of having enough technology to preserve brazilwood seed viability for at least two years, there is scarce information on the optimal conditions for germination, mainly concerning temperature, light and substrate. This research aimed to study the effects of the constant temperatures (10 to 45°C), the presence or absence of light and the moisture content of three substrates (paper, sand and vermiculite) on the germination of C. echinata seeds. The results suggested that these seeds should be sowed on paper roll moistened at the ratio 1:2.5 or 1:3.0 (substrate:water, w/w) at 25°C, no need for light.
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mello2007revistatemperatura,
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| Authors | ;Juliana Iura de Oliveira Mello;Claudio José Barbedo |
| Journal | journal of veterinary medical research |
| Year | 2007 |
| DOI |
10.1590/S0100-67622007000400009
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