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Germination response to temperature, salinity, light and depth of sowing of ten tropical dune species

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Abstract

This study describes the germination responses of ten tropical dune species to several factors to which their seeds are exposed in the field. Species studied were: three sand dune endemics (Amaranthus greggii, Palafoxia lindenii, and Trachypogon gouini), three pantropical coastal species (Sesuvium portulacastrum, Sporobolus virginicus and Ipomoea stolonifera) and four cosmopolitan grasses also found inland (Panicum repens, Panicum maximum, Pappophorum vaginatum and Andropogon glomeratus). Six species germinated when exposed to different constant temperatures. Four required temperature fluctuation (S. portulacastrum, P. lindenii, S. virginicus, P. repens). Light promoted germination of three species (S. Portulacastrum, P. vaginatum, P. lindenii). Species varied in their degree of sensitivity to salinity. Seeds of T. gouini, I. stolonifera, S. portulacastrum, P. repens, P. Maximum and P. vaginatum were able to germinate under some of the salinity concentrations. Not all species were able to recover after being transferred to distilled water. Seedling emergence was inhibited when seeds were buried. This response was related to depth and to seed size. S. portulacastrum and S. virginicus were the most affected. Nitrates only affected germination response of two species. Seed age promoted germination under a wider range of conditions. P. lindenii showed very heterogeneous responses depending on seed cohort. No dormancy mechanisms were found, other than a thermoperiod and/or light requirement for some of the species. Cosmopolitan grasses tolerated both sand burial and salinity, although the endemics were the most successful in emerging from sand burial; coastal pantropicals were very tolerant to high saline concentrations and recovered completely.

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Authors and Affiliations

  1. Laboratorio Especializado de Ecología, UNAM, 04510, México, D.F., México

    M. L. Martínez & T. Valverde

  2. Laboratorio de Ecología, Facultad de Ciencias, UNAM, 04510, México, D.F., México

    M. L. Martínez & P. Moreno-Casasola

  3. Instituto de Ecología, Apdo. Postal 63, 91 000, Xalapa, Veracruz, Mexico

    P. Moreno-Casasola

Authors
  1. M. L. Martínez
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  2. T. Valverde
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  3. P. Moreno-Casasola
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Martínez, M.L., Valverde, T. & Moreno-Casasola, P. Germination response to temperature, salinity, light and depth of sowing of ten tropical dune species. Oecologia 92, 343–353 (1992). https://doi.org/10.1007/BF00317460

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  • DOI: https://doi.org/10.1007/BF00317460

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