Resumen

ROJAS-ARECHIGA, Mariana  y  MANDUJANO-SANCHEZ, María C.. Secondary dormancy in tribe Cacteae (Cactaceae) species. Polibotánica [online]. 2017, n.44, pp.137-145. ISSN 1405-2768.  https://doi.org/10.18387/polibotanica.44.10.

Under unpredictable environments, such as arid regions, seed dormancy mechanisms are important for plant populations perpetuation. Many plant species have light requirements to germinate, then photoblastism and dormancy mechanisms have been associated with seed banks. In arid regions, water is a limiting factor for seed germination and seedling establishment. Therefore, the existence of a soil seed bank may increase the chance of a seed to coincide with a precipitation event. We studied the photoblastic response and the possible development of a secondary dormancy in seeds of five species from tribe Cacteae: Echinocactus platyacanthus, Ferocactus peninsulae, Mammillaria compressa, Strombocactus disciformis and Turbinicarpus gielsdorfianus. We found that these species are positive photoblastic and two of them (Mammillaria compressa and Turbinicarpus gielsdorfianus) developed skotodormancy, after darkness incubation during one month. We discussed on the importance of this kind of secondary dormancy and its possible role on the seed bank establishment.

Palabras llave : cactus; germination; photoblastism; seed bank.

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