2 research outputs found

    Germinaci贸n y crecimiento inicial de Acacia senegal (Linne), Acacia seyal (Del.) y Boswellia papyrifera

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    El conocimiento del proceso de germinaci贸n, crecimiento y desarrollo inicial de las principales especies arb贸reas de zonas 谩ridas y semi谩ridas de 脕frica son prerrequisitos fundamentales para evitar su sobre-explotaci贸n y degradaci贸n, as铆 como para promover la restauraci贸n de la cubierta vegetal, y la conservaci贸n de los recursos h铆dricos y ed谩ficos. El g茅nero Acacia tiene un gran potencial para mejorar la cubierta arb贸rea, para resistir el estr茅s por sequ铆a, y tambi茅n por los m煤ltiples bienes y servicios que se pueden obtener de estos 谩rboles como por ejemplo productos no maderables (gomas, resinas y compuestos farmac茅uticos), forraje para el ganado, fuente de madera y provisi贸n de sombra, cercas y para mantener la fertilidad del suelo a trav茅s de la fijaci贸n de Nitr贸geno. Otro g茅nero muy importante ambiental, econ贸mica y socialmente es el g茅nero Boswellia. Por ejemplo, Boswellia papyrifera (Del) es la especie productora principal del incienso de mayor calidad.Departamento de Producci贸n Vegetal y Recursos Forestale

    Effect of heat shock on the germination of seeds of the species Acacia senegal L. and Acacia seyal Del. from sub-Saharan Africa (Ethiopia).

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    Producci贸n Cient铆ficaAim of the study: Understanding post-fire germination of tree species in arid and semi-arid zones of sub-Saharan Africa.Area of study: Ethiopian Acacia senegal L. and Acacia seyal Del. forests.Material and methods: Seeds were subjected to heat shocks at combinations of four temperatures (60潞, 90潞, 120潞 and 150潞C) and three exposure times (1, 5 and 10 minutes). A control was also included, resulting in a total of thirteen treatments. After the application of the heat shocks, the viability of no germinated seeds was assessed after immersion in a Tetrazolium solution. A mixed and a logistic model were used to analyse the influence of heat shock on germination.Main results: Results showed that germination depended on the species, the heat shock treatment and their interaction. Both species showed similar germination results at temperatures below 90潞C in all exposure times, however, germination in Acacia senegal was statistically higher in most of the heat shocks. On the other hand, germination probability decreased in both species, when the exposure time increased, although with a different behaviour. In 1 minute of time of exposure, the germination probability was higher than 60% in the two species throughout the temperature range. However, at 5 minutes of time and temperature smaller than 90掳C, the probability of germination was higher than 70% in A. senegal and 50% in A. seyal. Although germination in both species was impacted by the different heat shocks, non-germinated seeds were viable.Research highlights: This paper showed, according to these results, that heat shock would negatively influence the regeneration of both species, and especially for A. seyalAgencia Espa帽ola de Cooperaci贸n Internacional para el Desarrollo (MAEC-AECID [584953])Programa Nacional de Selecci贸n e Incorporaci贸n de Personas, programm [PTQ-12-05409
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