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espanolResumen: Las semillas hidrocoras generalmente poseen algun tipo de estructuras para la dispersion en agua. Las estructuras pueden presentar menos densidad que el agua, peso especifico bajo, camaras de aire, tejido esponjoso y cotiledones pequenos con tejido esponjoso. En el presente trabajo se evaluo la capacidad de flotabilidad de las semillas de Astrophytum coahuilense y las estructuras que le confieren esta caracteristica. Los valores de la densidad del agua y la densidad de la semilla se contrastaron para demostrar la tendencia a flotar. Un grupo de cinco semillas completas, cinco estructuras de camaras vacias y cinco estructuras de camara del embrion con cinco repeticiones, respectivamente, fueron puestos a prueba, colocandolas en agua destilada durante 24 horas, cuantificando las semillas y estructuras que se mantuvieron a flote. La camara vacia y la semilla completa mostraron mayor capacidad de flotabilidad respecto a las camaras de los embriones, sugiriendo que la camara vacia le proporciona a la semilla una menor densidad respecto a la del agua, proporcionandole la capacidad de flotar. EnglishAbstract: Hidrocoras seeds usually have some type of structures for dispersion in water. The structures may have less density than water, low specific weight, chambers of air, spongy tissue and small cotyledons with spongy tissue. This study evaluated the ability of buoyancy of Astrophytum coahuilense seeds and the structures that give this feature. The density of water and seed density values were compared to demonstrate the tendency to float. A group of five full seeds, five chambers empty structures and five structures of Chamber of the embryo with five replicates, respectively, were put to the test, by placing them in distilled water for 24 hours, by quantifying the seeds and structures that remained afloat. The empty chamber and full seed showed greater buoyancy compared to the embryo chamber, suggesting that the empty chamber provides to the seed a lower density with respect to the water, giving it the ability to float.

HYDROCHORY IN Astrophytum coahuilense: EXPERIMENT TO IDENTIFY SEMINAL STRUCTURES THAT PROVIDE ITS BUOYANCY