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Induction of Seed Germination in Cistus heterophyllus (Cistaceae): A Rock Rose Critically Endangered in Spain

AutorNavarro-Cano, J. A. ; Rivera, Diego; González Barberá, Gonzalo
Palabras claveSeed germination
Cistus heterophyllus
Fecha de publicación2009
EditorAcademic Journals
CitaciónResearch Journal of Botany 4(1): 10-16 (2009)
ResumenSeed germination from the only European population of the Iberian-North African endemism Cistus heterophyllus Desf. was studied by using germination inducing pretreatments. A seeding-cultivation method with flowerpots in a greenhouse was also tested and compared with the usual germination method using Petri dishes in a growth chamber. Seeds were collected in three different years. Germination percentages ca. 43% were obtained without pretreatment. This can be considered a high percentage in the genus Cistus and abnormally large for an isolated population composed by only nine individuals. A large variability in seed germination was found among the samples from the same population collected in different years. The dry-heat pretreatment (87 ±3 °C for 12 min and soaking in water at 20 °C for 48 h) significantly increased the germination percentage, reaching 81.5%. Germination in greenhouse was as effective as in growth chamber. The seeds maintained their viability until at least 6 years after collection and storage in a dry atmosphere at laboratory temperature. These results mean the first contribution to the germination ecophysiology of this species and they are fundamental to the recovery plan of the last remnant population of C. heterophyllus in Spain.
Versión del editorhttp://dx.doi.org/10.3923/rjb.2009.10.16
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