Light effect on seed germination of four Mammillaria species from the Tehuacán-Cuicatlán valley, central Mexico
Por:
Benítez-Rodríguez J.L., Orozco-Segovia A., Rojas-Aréchiga M.
Publicada:
1 ene 2004
Resumen:
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.
Filiaciones:
Benítez-Rodríguez J.L.:
Instituto de Ecología, UNAM, A.P. 70-275, 04510 México, D. F., Mexico
Orozco-Segovia A.:
Instituto de Ecología, UNAM, A.P. 70-275, 04510 México, D. F., Mexico
Rojas-Aréchiga M.:
Instituto de Ecología, UNAM, A.P. 70-275, 04510 México, D. F., Mexico
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