Photosynthetic responses of understory savanna plants: Implications for plant persistence in savannas under tree encroachment
Autor(a) principal: | |
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Data de Publicação: | 2018 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1016/j.flora.2017.12.009 http://hdl.handle.net/11449/175704 |
Resumo: | Savannas are ecosystems where plants are expected to have leaf-level adaptations conferring tolerance to high irradiances, which characterizes this type of open canopy vegetation. The neotropical savannas of Brazil (Cerrado) harbour a large diversity of heliophilous herbaceous species, which are threatened by the current invasion of those open canopy habitats by forest trees, increasing tree density and canopy cover, thereby strongly reducing light availability. In this study, we measured leaf pigment concentrations, specific leaf area and light response curves of photosynthesis to determine whether herbaceous species of open savanna habitats were less tolerant to shade than the ones that were more characteristic of forested savanna. Relative to species of forested savannas, herbaceous species of open savannas had heavier leaves with higher concentration of carotenoids. They also achieved higher photosynthetic rates, reaching light compensation and saturation at higher irradiances. Based on measurements of light compensation points and of prevailing irradiances in forested savannas, leaves of most herbaceous species of more open savannas would be strongly light-limited in sites with a dense woody layer. In summary, we provide evidence that forest tree encroachment of savannas would select for leaf trait combinations in the understory vegetation that would favor shade tolerance and, depending on the degree of leaf acclimatization to shade of individual species, could strongly constrain persistence of the current understory vegetation. |
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Photosynthetic responses of understory savanna plants: Implications for plant persistence in savannas under tree encroachmentCerradoEncroachmentLeaf functional traitsLeaf gas exchangeLeaf pigmentsShade toleranceSavannas are ecosystems where plants are expected to have leaf-level adaptations conferring tolerance to high irradiances, which characterizes this type of open canopy vegetation. The neotropical savannas of Brazil (Cerrado) harbour a large diversity of heliophilous herbaceous species, which are threatened by the current invasion of those open canopy habitats by forest trees, increasing tree density and canopy cover, thereby strongly reducing light availability. In this study, we measured leaf pigment concentrations, specific leaf area and light response curves of photosynthesis to determine whether herbaceous species of open savanna habitats were less tolerant to shade than the ones that were more characteristic of forested savanna. Relative to species of forested savannas, herbaceous species of open savannas had heavier leaves with higher concentration of carotenoids. They also achieved higher photosynthetic rates, reaching light compensation and saturation at higher irradiances. Based on measurements of light compensation points and of prevailing irradiances in forested savannas, leaves of most herbaceous species of more open savannas would be strongly light-limited in sites with a dense woody layer. In summary, we provide evidence that forest tree encroachment of savannas would select for leaf trait combinations in the understory vegetation that would favor shade tolerance and, depending on the degree of leaf acclimatization to shade of individual species, could strongly constrain persistence of the current understory vegetation.Dermatology FoundationDepartamento de Biologia Faculdade de Ciências Agrárias e Veterinárias Univ. Estadual Paulista UNESP Campus de Jaboticabal, Via de Acesso Prof. Paulo Donato Castellane S/N, Vila IndustrialDepartamento de Botânica Instituto de Ciências Biológicas Universidade de Brasília Campus Darcy Ribeiro, Asa NorteDepartamento de Biologia Faculdade de Ciências Agrárias e Veterinárias Univ. Estadual Paulista UNESP Campus de Jaboticabal, Via de Acesso Prof. Paulo Donato Castellane S/N, Vila IndustrialDermatology Foundation: 1078/2016Universidade Estadual Paulista (Unesp)Universidade de Brasília (UnB)Rossatto, Davi Rodrigo [UNESP]de Araújo, Paola Eduarda [UNESP]da Silva, Bianca Helena Porfírio [UNESP]Franco, Augusto César2018-12-11T17:17:09Z2018-12-11T17:17:09Z2018-03-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article34-39application/pdfhttp://dx.doi.org/10.1016/j.flora.2017.12.009Flora: Morphology, Distribution, Functional Ecology of Plants, v. 240, p. 34-39.0367-2530http://hdl.handle.net/11449/17570410.1016/j.flora.2017.12.0092-s2.0-850397540642-s2.0-85039754064.pdfScopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengFlora: Morphology, Distribution, Functional Ecology of Plants0,570info:eu-repo/semantics/openAccess2024-06-06T13:04:11Zoai:repositorio.unesp.br:11449/175704Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T15:38:24.679400Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Photosynthetic responses of understory savanna plants: Implications for plant persistence in savannas under tree encroachment |
title |
Photosynthetic responses of understory savanna plants: Implications for plant persistence in savannas under tree encroachment |
spellingShingle |
Photosynthetic responses of understory savanna plants: Implications for plant persistence in savannas under tree encroachment Rossatto, Davi Rodrigo [UNESP] Cerrado Encroachment Leaf functional traits Leaf gas exchange Leaf pigments Shade tolerance |
title_short |
Photosynthetic responses of understory savanna plants: Implications for plant persistence in savannas under tree encroachment |
title_full |
Photosynthetic responses of understory savanna plants: Implications for plant persistence in savannas under tree encroachment |
title_fullStr |
Photosynthetic responses of understory savanna plants: Implications for plant persistence in savannas under tree encroachment |
title_full_unstemmed |
Photosynthetic responses of understory savanna plants: Implications for plant persistence in savannas under tree encroachment |
title_sort |
Photosynthetic responses of understory savanna plants: Implications for plant persistence in savannas under tree encroachment |
author |
Rossatto, Davi Rodrigo [UNESP] |
author_facet |
Rossatto, Davi Rodrigo [UNESP] de Araújo, Paola Eduarda [UNESP] da Silva, Bianca Helena Porfírio [UNESP] Franco, Augusto César |
author_role |
author |
author2 |
de Araújo, Paola Eduarda [UNESP] da Silva, Bianca Helena Porfírio [UNESP] Franco, Augusto César |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) Universidade de Brasília (UnB) |
dc.contributor.author.fl_str_mv |
Rossatto, Davi Rodrigo [UNESP] de Araújo, Paola Eduarda [UNESP] da Silva, Bianca Helena Porfírio [UNESP] Franco, Augusto César |
dc.subject.por.fl_str_mv |
Cerrado Encroachment Leaf functional traits Leaf gas exchange Leaf pigments Shade tolerance |
topic |
Cerrado Encroachment Leaf functional traits Leaf gas exchange Leaf pigments Shade tolerance |
description |
Savannas are ecosystems where plants are expected to have leaf-level adaptations conferring tolerance to high irradiances, which characterizes this type of open canopy vegetation. The neotropical savannas of Brazil (Cerrado) harbour a large diversity of heliophilous herbaceous species, which are threatened by the current invasion of those open canopy habitats by forest trees, increasing tree density and canopy cover, thereby strongly reducing light availability. In this study, we measured leaf pigment concentrations, specific leaf area and light response curves of photosynthesis to determine whether herbaceous species of open savanna habitats were less tolerant to shade than the ones that were more characteristic of forested savanna. Relative to species of forested savannas, herbaceous species of open savannas had heavier leaves with higher concentration of carotenoids. They also achieved higher photosynthetic rates, reaching light compensation and saturation at higher irradiances. Based on measurements of light compensation points and of prevailing irradiances in forested savannas, leaves of most herbaceous species of more open savannas would be strongly light-limited in sites with a dense woody layer. In summary, we provide evidence that forest tree encroachment of savannas would select for leaf trait combinations in the understory vegetation that would favor shade tolerance and, depending on the degree of leaf acclimatization to shade of individual species, could strongly constrain persistence of the current understory vegetation. |
publishDate |
2018 |
dc.date.none.fl_str_mv |
2018-12-11T17:17:09Z 2018-12-11T17:17:09Z 2018-03-01 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1016/j.flora.2017.12.009 Flora: Morphology, Distribution, Functional Ecology of Plants, v. 240, p. 34-39. 0367-2530 http://hdl.handle.net/11449/175704 10.1016/j.flora.2017.12.009 2-s2.0-85039754064 2-s2.0-85039754064.pdf |
url |
http://dx.doi.org/10.1016/j.flora.2017.12.009 http://hdl.handle.net/11449/175704 |
identifier_str_mv |
Flora: Morphology, Distribution, Functional Ecology of Plants, v. 240, p. 34-39. 0367-2530 10.1016/j.flora.2017.12.009 2-s2.0-85039754064 2-s2.0-85039754064.pdf |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Flora: Morphology, Distribution, Functional Ecology of Plants 0,570 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
34-39 application/pdf |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808128542965235712 |