Serotiny degree may hypothetically depend on mother plant age and fire severity, and fire severity can strongly affect the regeneration of Pinus pinaster Aiton, which is an obligate seeder species with aerial seed banks stocked in cones showing a certain degree of serotiny. The main objective of this study was to evaluate the effect of serotiny and mother plant age on seed germination of P. pinaster in relation to fire severity. For this purpose, cones were collected in two stands from mother trees of different ages. Serotinous cones were opened in oven at increasing temperatures to determine the number of seeds released. The length of cones and the number and weight of seeds were measured. Seeds from both classes of mother plant age were subjected to 34 different treatments simulating different fire severity levels, and their germination was recorded. The results showed that serotiny was significantly higher in cones from young mother trees. Seed germination in the control groups from serotinous cones was always higher than that from non-serotinous cones without thermal shock. Fire severity decreased seed germination as fire severity increases in both mother age classes. Mother plant age was related to the serotiny level, which was higher in young than in old trees, suggesting a strong selection in the population due to a recent fire.
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Citation
Cruz O, García-Duro J, Casal M, Reyes O (2019). Role of serotiny on Pinus pinaster Aiton germination and its relation to mother plant age and fire severity. iForest 12: 491-497. - doi: 10.3832/ifor2968-012
Academic Editor
Andrea Cutini
Paper history
Received: Oct 04, 2018
Accepted: Aug 08, 2019
First online: Nov 02, 2019
Publication Date: Dec 31, 2019
Publication Time: 2.87 months
© SISEF - The Italian Society of Silviculture and Forest Ecology 2019
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