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Repeated stand-replacing crown fires affect seed morphology and germination in Aleppo pine

Saracino Antonio, Bellino Alessandro, Allevato Emilia, Mingo Antonio, Conti Stefano, Rossi Sergio, Bonanomi Giuliano, Carputo Domenico et Mazzoleni Stefano. (2017). Repeated stand-replacing crown fires affect seed morphology and germination in Aleppo pine. Frontiers in Plant Science, 8, (1160), p. 1-11.

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Post-fire reproductive niche of Aleppo pine (Pinus halepensis) is deeply interlaced with fire products. Indeed, the high pH and low osmotic potentials of ash beds under burnt crowns constitute the main constraints to seed germination. In this study, we aim to investigate whether fire recurrence, through the physico-chemical constraints imposed by the ash beds, affects the reproduction ability of P halepensis at the germination stage. To this aim, Aleppo pine seeds were collected in neighboring even-aged stands subjected to 0, 1, or 2 fires (namely fire cohorts), and seed morphology and germination performance, in terms of cumulative germination and germination kinetics, were studied under increasing osmotic potentials (from 0.0 to -1.2 MPa) and pH (from 6 to 11). Besides fire history, the role of ontogenetic age of mother plants on seed morphology and germination was also investigated. Differences in seed morphology among the three cohorts have been highlighted in a multivariate context, with anisotropic enlargement of the seeds produced by pine stands experiencing repeated fires. The patterns of seed germination varied primarily in relation to the fire cohort, with seeds from the pine stand experiencing repeated fires exhibiting enhanced tolerance to pH stress. Conversely, germination performances under osmotic constraints mainly depends on tree ontogenetic stage, with an involvement of fire history especially in the timing of seed germination. Our results suggest that, at least in the short term, fire recurrence does not constrain the reproduction ability of Aleppo pine. These results highlight the need for further research to elucidate the mechanisms behind these responses to recurrent fires.

Type de document:Article publié dans une revue avec comité d'évaluation
Pages:p. 1-11
Version évaluée par les pairs:Oui
Sujets:Sciences naturelles et génie > Sciences appliquées > Foresterie et sciences du bois
Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes
Département, module, service et unité de recherche:Départements et modules > Département des sciences fondamentales
Mots-clés:fire recurrence, seed germination, seed morphometry, osmotic potential, Pinus halepensis, Mediterranean, ph, tree ontogeny
Informations complémentaires:This Document is protected by copyright and was first published by Frontiers. All rights reserved. It is reproduced with permission
Déposé le:24 août 2017 13:12
Dernière modification:24 août 2017 13:12
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