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Heat and smoke affect the germination of flammable resprouters: Vellozia species in the Cerrado

  • Heloiza Lourenço Zirondi
  • Henrique de Pinho José
  • L. Felipe Daibes
  • Alessandra FidelisEmail author
Article

Abstract

Fire is an important ecological factor shaping plant strategies. Plants that are not able to survive fire and rely on seed reproduction may have seeds adapted for surviving heat shock or their germination may even be enhanced by heat or smoke. In order to find out whether such adaptations may be found in plants able to survive fire and resprout, we examined the germination of ten Vellozia species in response to heat shock and smoke. Seeds were collected in two community types differing in fire frequency: campos sujos (open savannas with frequent and hotter fires) and campos rupestres (montane grasslands on rocky outcrops, with less frequent and milder fires). We hypothesized that seeds of plants inhabiting campos sujos would be more tolerant to fire or will even be stimulated by heat shock or smoke in comparison with seeds of plants inhabiting campos rupestres. We confirmed our expectations only partly, as (i) seeds of all species survived heat shocks of 60 and 100°C for one minute and seeds of three species survived the temperature of 200°C, (ii) the smoke treatments increased germination by 20–40% in three species from both communities, and (iii) mortality after the hottest heat shock was greater in seeds of plants from campos rupestres than from campos sujos. Fire- and smoke-related germination strategies help populations of Vellozia species to cope with recurrent fires in fire-prone ecosystems.

Keywords

Campos rupestres Fire-related cues Heat shock Neotropical savanna Propagule tolerance Smoke 

Notes

Acknowledgements

We thank M.B. Cunha, E. Gorgone-Barbosa, F.A.O. Silveira, R.L.C. Dayrell, K.S. Rezende and K.O. Nardi for helping with seed collection and R. Mello-Silva for helping with plant identification. We also thank Fiona McCusker for the English review and two anonymous reviewers and the editors for their valuable contributions. This study received financial support from FUNDUNESP/PROPe (0163/004/13-PROPe/CDC), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq 455183/2014-7), Fundação Grupo Boticário (0153_2011_PR) and Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP 2015/06743-0). H.L.Z. received financial support from FAPESP (2016/01563-7), H.P.J. from PIBIC, L.F.D. from CAPES (Finance Code 001). A. F. received a research grant from CNPq (306170/2015-9).

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Copyright information

© Institute of Botany, Academy of Sciences of the Czech Republic 2019

Authors and Affiliations

  1. 1.Instituto de Biociências, Lab of Vegetation EcologyUniversidade Estadual Paulista (UNESP)Rio ClaroBrazil

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