Maiti, R. K. creator Hernández Piñero, J. L. Valdez Marroquín, M. text ag 2006 continuing eng 9 páginas The variations in seed ultrastructure of species of Cactaceae is related in this paper to their germination capacity. Rapid and high percentage of germination is associated with a thin testa and the presence of starch granules. It was also found that no germination occurred in the darkness but only after light exposure. This may be related to the activation of the phytochrome system. fot. byn., fot. col. Cactaceae Germinación Semilla 0031-9457 238927 v. 55 (1994) AR-ReUNN 260630 20260702003308.0 238997 spa