Fire cues trigger germination and stimulate seedling growth of grass species from Brazilian savannas

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dc.contributor.authorRamos, Desirée M. [UNESP]
dc.contributor.authorValls, José F. M.
dc.contributor.authorBorghetti, Fabian
dc.contributor.authorOoi, Mark K. J.
dc.contributor.institutionUniversidade de Brasília (UnB)
dc.contributor.institutionEmpresa Brasileira de Pesquisa Agropecuária (EMBRAPA)
dc.contributor.institutionUniversity of New South Wales/Australia
dc.contributor.institutionUniversity of Wollongong/Australia
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2019-10-06T15:53:47Z
dc.date.available2019-10-06T15:53:47Z
dc.date.issued2019-01-01
dc.description.abstractPremise: Although fire cues (high temperatures and smoke) influence seed germination in numerous species from fire-prone environments, their effects on seed germination of species from neotropical savannas are poorly understood. Methods: We exposed seeds of eight grass species from the Cerrado, the Brazilian savanna to heat-shock (80°C or 110°C for 5 min) and/or smoke water, and then set them to germinate in light or dark, at either summer (28°C/18°C) or winter (27°C/14°C) temperature regimes in an incubator. In addition, we evaluated the effects of smoke water on seedling root and shoot growth for four of the species. Results: Smoke interacted with the dark treatment to increase germination from 28% to 93% in Aristida recurvata and 77% to 95% in Aristida riparia. Smoke had no effect on germination of either of these species in the light. Heat-shock alone also promoted seed germination in A. recurvata. For Digitaria lehmanniana, smoke interacted with heat-shock to improve germination from 5% to 16%. In contrast, the fire treatments did not have any effect on the seed germination of the remaining five species. Smoke water stimulated root growth for A. riparia, A. recurvata, and Ctenium cirrosum but had no effect on their shoot growth. Conclusions: The strong promotive effect of smoke on Aristida germination suggests that these species are fire-adapted. Aristida species have an active awn system, which facilitates seed burial, and the smoke and dark interaction would ensure buried seeds germinated post-fire. The species that showed no response to fire cues may either have adapted via alternative strategies or require different concentrations of smoke or levels of heat. This study is one of very few examples showing a positive germination and seedling growth response to smoke for species from neotropical savannas.en
dc.description.affiliationDepartamento de Botânica Universidade de Brasília/Brasil
dc.description.affiliationBrazilian Corporation of Agricultural Research/Embrapa
dc.description.affiliationCentre for Ecosystem Science School of Biological Earth and Environmental Sciences University of New South Wales/Australia
dc.description.affiliationSchool of Earth Atmospheric and Life Sciences University of Wollongong/Australia
dc.description.affiliationLaboratório de Fenologia Departamento de Botânica Instituto de Biociências UNESP—Universidade Estadual Paulista
dc.description.affiliationUnespLaboratório de Fenologia Departamento de Botânica Instituto de Biociências UNESP—Universidade Estadual Paulista
dc.identifierhttp://dx.doi.org/10.1002/ajb2.1345
dc.identifier.citationAmerican Journal of Botany.
dc.identifier.doi10.1002/ajb2.1345
dc.identifier.issn0002-9122
dc.identifier.scopus2-s2.0-85071076193
dc.identifier.urihttp://hdl.handle.net/11449/187997
dc.language.isoeng
dc.relation.ispartofAmerican Journal of Botany
dc.rights.accessRightsAcesso aberto
dc.sourceScopus
dc.subjectcampo sujo
dc.subjectenvironmental cues
dc.subjectgrasses
dc.subjectheat-stimulated germination
dc.subjectkarrikinolide
dc.subjectphysiological dormancy
dc.subjectPoaceae
dc.subjectpost-fire environment
dc.subjectseed dormancy
dc.subjectseedling recruitment
dc.titleFire cues trigger germination and stimulate seedling growth of grass species from Brazilian savannasen
dc.typeArtigo
unesp.author.orcid0000-0002-3342-6708[1]

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