Seed germination of native species that colonize roadside slopes in northwestern Patagonia
DOI:
https://doi.org/10.25260/EA.24.34.1.0.2182Keywords:
degraded areas, dormancy, pre-germinative treatments, propagation, restorationAbstract
The knowledge of the ecophysiology of seed germination in colonizing species is useful for their propagation and use in revegetation. The aim was to assess the germination requirements and dormancy type of native species from steppe and forest ecosystems colonizing slopes in the Northwest Patagonia. The postulated hypothesis was that seeds exhibit dormancy associated with their native environment: physiological or morphological dormancy in humid environments and physical dormancy in dry environments. Two pregermination treatments were applied after six months of dry cold storage: moist-cold stratification (5 °C, 45 days) or mechanical scarification with a scalpel, along with a control group. The seeds were germinated under controlled temperature and photoperiod conditions (10/20 °C, 12/12 h). Percentage, time, and mean germination were calculated. Both treatments and the control for each species were compared, and a principal component analysis was conducted. Post-assessment, the percentage of viable seeds not germinated, empty seeds, and those with fungal presence or insect damage were calculated. Seed dormancy was not associated with their native environment; however, other factors (e.g., climatic seasonality, phylogenetic similarity) might be related to dormancy regulation mechanisms. Seeds of Acaena ovalifolia and Baccharis linearis showed no dormancy, achieving germination rates >80% in the control. Anemone multifida seeds exhibited physical dormancy, with a significant increase in germination with mechanical scarification treatment. Both pre-treatments advanced and accelerated germination in Acaena magellanica and A. splendens. The dormancy type of other species could not be determined. This study provides valuable information on the ecophysiological germination conditions of native species to be incorporated into ex situ and in situ propagation protocols for restoring degraded areas.
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