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Light Effect on Seed Germination of Four Mammillaria Species from the Tehuacán-Cuicatlán Valley, Central Mexico

J. Leopoldo Benítez-Rodríguez, Alma Orozco-Segovia and Mariana Rojas-Aréchiga
The Southwestern Naturalist
Vol. 49, No. 1 (Mar., 2004), pp. 11-17
Stable URL: http://www.jstor.org/stable/3672260
Page Count: 7
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Light Effect on Seed Germination of Four Mammillaria Species from the Tehuacán-Cuicatlán Valley, Central Mexico
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Abstract

Seed germination of 4 species of Mammillaria (Cactaceae) from the Tehuacán-Cuicatlán Valley in central México were compared at 4 light treatments (red, far-red, white light, and darkness) at 25°C and at 2 light treatments (white light and darkness) at 2 alternating temperatures (15/30°C and 20/35°C). Seeds were positive photoblastic, but germinated at far-red light. For all species, best germination results were obtained at 25°C with white and red light, and there were no significant differences among treatments. Higher germination percentages were obtained at 25°C than at alternating temperatures. None of the species exhibited any morphophysiological mechanisms of dormancy. /// La germinación de 4 especies del género Mammillaria (Cactaceae) del Valle de Tehuacán-Cuicatlán, México, se comparó en 4 tratamientos: luz roja, roja lejana, blanca y oscuridad a 25°C y en luz blanca y oscuridad a 2 temperaturas alternantes (15/30°C y 20/35°C). Las semillas resultaron ser fotoblásticas positivas, aunque germinaron en rojo lejano. Para todas las especies la mejor germinación se obtuvo a 25°C con luz blanca y luz roja, y no hubo diferencias significativas entre tratamientos. Se obtuvieron porcentajes más altos de germinación a 25°C que a temperaturas alternantes. Las semillas no presentaron ningún mecanismo de latencia morfofisiológica.

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