Abstract
Seeds ofPinus halepensis andPinus pinaster subsp.pinaster were subjected to four heat treatments (90, 110, 150 and 200 °C) for 1 and 5 min to investigate their tolerances to high temperatures resulting from fires. Another group of seeds of each species were not heated and considered as a control. Information on responses of seeds to high temperatures would help to determine whether or not the species are pyrophytes. Heating for 1 min at all temperatures did not affect the average germination ofPinus halepensis seeds whereas that ofP. pinaster subsp.pinaster seeds was decreased significantly when they were heated to 200 ° C. HoweverP. pinaster seeds were more resistant than that ofP. halepensis when heat treatment was 150 °C for 5 min. Data obtained also indicated that, in general,P. halepensis andP. pinaster subsp.pinaster seed germination is not favoured by a temperature increase than can be reached in soils during a fire. Thus, the species are not pyrophytes but colonizers of burnt sites.
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Martínez-Sánchez, J.J., Marín, A., Herranz, J.M. et al. Effects of high temperatures on germination ofPinus halepensis Mill. andP. pinaster Aiton subsp.pinaster seeds in southeast Spain. Vegetatio 116, 69–72 (1995). https://doi.org/10.1007/BF00045279
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DOI: https://doi.org/10.1007/BF00045279