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Seed germination at different temperatures and seedling emergence at different depths of Rhamnus spp

  • Research Article
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Central European Journal of Biology

Abstract

Rhamnus alaternus and R. ludovici-salvatoris, two Mediterranean shrubs with different geographic distributions, have shown important differences in seedling recruitment capacity. The objectives of this work were to determine the ability of these species to germinate seeds under different temperature ranges, as well as the capacity of seedlings to emerge from different burial depths, in order to better understand their regeneration processes. Two different experiments were performed. In the first one, seed germination was studied in Petri dishes and in the dark at different temperature regimes: a) 5–15°C, b) 10–20°C and c) 15–25°C (12h/12h). In the second experiment, seedling emergence capacity from different burial depths (0.5, 2 and 5 cm) was tested. R. ludovici-salvatoris showed a significantly higher final germination rates, a lower dormancy period, and average time response at 10–20°C than at other temperature ranges, although differences were much greater when seeds were subjected to the 5–15°C temperature regime. By contrast, R. alaternus did not show significant differences between treatments (5–15°C and 10–20°C) in germination behavior. Seedling emergence of both species was lower and slower when seeds were buried at 5 cm. However, R. ludovici-salvatoris always showed a lower seedling emergence capacity than R. alaternus at any burial depth. The low ability of R. ludovici-salvatoris to germinate seeds and emerge between 5–15°C, even from shallow depths, is discussed in relation to its low regeneration capacity and declining geographic distribution.

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Authors and Affiliations

  1. Department of Biology, the University of the Balearic Islands, 07122, Palma de Mallorca, Spain

    Hanan El Aou-ouad, Hipólito Medrano & Javier Gulías

  2. Département de Biologie, Université Abdelmalek Essaadi Faculté des sciences, B.P. 2121, 93002, Tetouan, Morocco

    Hanan El Aou-ouad & Ahmed Lamarti

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  1. Hanan El Aou-ouad
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  2. Hipólito Medrano
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  3. Ahmed Lamarti
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  4. Javier Gulías
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Correspondence to Hanan El Aou-ouad.

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El Aou-ouad, H., Medrano, H., Lamarti, A. et al. Seed germination at different temperatures and seedling emergence at different depths of Rhamnus spp. cent.eur.j.biol. 9, 569–578 (2014). https://doi.org/10.2478/s11535-014-0291-4

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  • DOI: https://doi.org/10.2478/s11535-014-0291-4

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