Katharina B Budde1,2, Santiago C González-Martínez1,2, Miguel Navascués3, Concetta Burgarella4, Elena Mosca5, Zaida Lorenzo1, Mario Zabal-Aguirre1, Giovanni G Vendramin6, Miguel Verdú7, Juli G Pausas7, Myriam Heuertz1,2. 1. INIA Forest Research Centre, Department of Forest Ecology and Genetics, Carretera A Coruña km 7·5, 28040 Madrid, Spain. 2. INRA, Université de Bordeaux, UMR 1202 BIOGECO, 33610 Cestas, France. 3. INRA, UMR1062 CBGP, 34988 Montferrier-sur-Lez, France. 4. INRA, UMR 1334 AGAP, 34060 Montpellier, France. 5. Faculty of Science and Technology, Free University of Bolzano, piazza Università 1, 39100 Bolzano, Italy. 6. National Research Council, Institute of Biosciences and Bioresources, Via Madonna del Piano 10, 50019 Sesto Fiorentino (Florence), Italy. 7. Centro de Investigaciones sobre Desertificación (CIDE-CSIC), 46113 Moncada (Valencia), Spain.
Abstract
Background and Aims: The recurrence of wildfires is predicted to increase due to global climate change, resulting in severe impacts on biodiversity and ecosystem functioning. Recurrent fires can drive plant adaptation and reduce genetic diversity; however, the underlying population genetic processes have not been studied in detail. In this study, the neutral and adaptive evolutionary effects of contrasting fire regimes were examined in the keystone tree species Pinus halepensis Mill. (Aleppo pine), a fire-adapted conifer. The genetic diversity, demographic history and spatial genetic structure were assessed at local (within-population) and regional scales for populations exposed to different crown fire frequencies. Methods: Eight natural P. halepensis stands were sampled in the east of the Iberian Peninsula, five of them in a region exposed to frequent crown fires (HiFi) and three of them in an adjacent region with a low frequency of crown fires (LoFi). Samples were genotyped at nine neutral simple sequence repeats (SSRs) and at 251 single nucleotide polymorphisms (SNPs) from coding regions, some of them potentially important for fire adaptation. Key Results: Fire regime had no effects on genetic diversity or demographic history. Three high-differentiation outlier SNPs were identified between HiFi and LoFi stands, suggesting fire-related selection at the regional scale. At the local scale, fine-scale spatial genetic structure (SGS) was overall weak as expected for a wind-pollinated and wind-dispersed tree species. HiFi stands displayed a stronger SGS than LoFi stands at SNPs, which probably reflected the simultaneous post-fire recruitment of co-dispersed related seeds. SNPs with exceptionally strong SGS, a proxy for microenvironmental selection, were only reliably identified under the HiFi regime. Conclusions: An increasing fire frequency as predicted due to global change can promote increased SGS with stronger family structures and alter natural selection in P. halepensis and in plants with similar life history traits.
Background and Aims: The recurrence of wildfires is predicted to increase due to global climate change, resulting in severe impacts on biodiversity and ecosystem functioning. Recurrent fires can drive plant adaptation and reduce genetic diversity; however, the underlying population genetic processes have not been studied in detail. In this study, the neutral and adaptive evolutionary effects of contrasting fire regimes were examined in the keystone tree species Pinus halepensis Mill. (Aleppo pine), a fire-adapted conifer. The genetic diversity, demographic history and spatial genetic structure were assessed at local (within-population) and regional scales for populations exposed to different crown fire frequencies. Methods: Eight natural P. halepensis stands were sampled in the east of the Iberian Peninsula, five of them in a region exposed to frequent crown fires (HiFi) and three of them in an adjacent region with a low frequency of crown fires (LoFi). Samples were genotyped at nine neutral simple sequence repeats (SSRs) and at 251 single nucleotide polymorphisms (SNPs) from coding regions, some of them potentially important for fire adaptation. Key Results: Fire regime had no effects on genetic diversity or demographic history. Three high-differentiation outlier SNPs were identified between HiFi and LoFi stands, suggesting fire-related selection at the regional scale. At the local scale, fine-scale spatial genetic structure (SGS) was overall weak as expected for a wind-pollinated and wind-dispersed tree species. HiFi stands displayed a stronger SGS than LoFi stands at SNPs, which probably reflected the simultaneous post-fire recruitment of co-dispersed related seeds. SNPs with exceptionally strong SGS, a proxy for microenvironmental selection, were only reliably identified under the HiFi regime. Conclusions: An increasing fire frequency as predicted due to global change can promote increased SGS with stronger family structures and alter natural selection in P. halepensis and in plants with similar life history traits.
Authors: Jon E Keeley; Juli G Pausas; Philip W Rundel; William J Bond; Ross A Bradstock Journal: Trends Plant Sci Date: 2011-05-14 Impact factor: 18.313
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Authors: Ryan C Hunt; Vijaya L Simhadri; Matthew Iandoli; Zuben E Sauna; Chava Kimchi-Sarfaty Journal: Trends Genet Date: 2014-06-19 Impact factor: 11.639
Authors: Binyin Di; Jennifer Firn; Yvonne M Buckley; Kate Lomas; Juli G Pausas; Annabel L Smith Journal: Evol Appl Date: 2022-03-27 Impact factor: 4.929
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Authors: Enikő I Major; Mária Höhn; Camilla Avanzi; Bruno Fady; Katrin Heer; Lars Opgenoorth; Andrea Piotti; Flaviu Popescu; Dragos Postolache; Giovanni G Vendramin; Katalin Csilléry Journal: Mol Ecol Date: 2021-08-20 Impact factor: 6.622