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GERMINACION DE SEMILLA DE CAFE CATURRA 1

GERMINACION DE SEMILLA DE CAFE CATURRA 1,Eric Guevara,Jorge Herrera,Ramiro Alizaga

GERMINACION DE SEMILLA DE CAFE CATURRA 1  
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Se detennino la influencia del contenido de Effect of the substrate and its water con- humedad del sustrato sobre la capacidad germinati- dition upon the germination of Caturra coffee va de semillas de cafe Caturra. Para ello se utilizo seeds. Coffee seeds with or without endocarp semilla con y sin endocarpo (pergamino) sembrada (parchment) were placed on 2 different sub- en dos tipos de sustratos: arena y papel de germina- strates: germination paper and sand, containing cion conteniendo 50, 75 y 100% de su capacidad de 50; 75 or 100% of water retention capacity. retencion de agua. Se evaluola imbibicion y la ger- Imbibition and germination time were evaluated minacion de las semillas en el tiempo, asf como la as well as germination speed, fresh and dry velocidad de germinacion, peso seco y fresco, y la weight, and elongation of the plant. Withouth elongacion de las plantulas. En ausencia del perga- parchment, water content of the substrate does not mino los niveles de humedad del sustrato no influ- affect the germination process. In the case of yeron sobre el proceso germinativo. Por el contra- seeds with parchment, increasing levels of water rio, en presencia del endocarpo, niveles crecientes in the substrate retarded the germination of the en el contenido de humedad del sustrato retardaron seeds. However, the behaviour of the imbibition significativamente la germinacion de las semillas. process was similar in both types of seeds, with Tanto en ausencia como en presencia del pergarni- and without parchment, indicating that the parch- no, la curva de imbibicion de agua de las semillas ment does not prevent water absorption by the mostro un comportarniento similar de aumento pro- seed. Hipocotyl elongation was highest in plants gresivo. La longitud del hipocotilo fue mayor en growing in sand. Seed without parchment showed arena que en papel. Semillas sin pergarnino produ- the higher elongation of the hipocotyl, but no dif- jeron plantulas de mayor longitud, pero no hubo di- ferences were observed due to the water content ferencias debidas al contenido de agua del sustrato. of the substrate. It is concluded that in the pres- Se concluye que con altos niveles de humedad del ence of higher water content of the substrate, the sustrato, el pergarnino afecta la germinacion de la parchment affects the germination of coffee semilla de cafe, allimitar la difusion de oxfgeno ha- seeds, restraining the diffusion of oxygen to the cia el embrion, 10 que impide su crecimiento. embryo. This delays the growth of the embryo.
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