Seed germination in Cistus ladanifer: heat shock, physical dormancy, soil temperatures and significance to natural regeneration
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10174/25379 https://doi.org/10.3390/plants8030063 |
Resumo: | Seeds of Cistus ladanifer experience bursts of germination following fires. The effects of heat shock from 10 °C to 150 °C on seed germination were investigated by final germination plus the number of days required for germination to start and finish, and symmetry of cumulative germination. The occurrence of physical dormancy in C. ladanifer seeds was investigated by a variety of methods, including imbibition, scanning electron microscopy (SEM) and light microscopy, and use of dyes. The significance of responses of C. ladanifer seeds to fires was investigated essentially by abstracting existing literature and by using fire effects models and simulations. Parameters of germination were variously affected by heat treatments—positively in the range 80100 °C, negatively above 130 °C. Non-dormancy was consistently found in about 30% of seeds but no evidence was obtained to support the existence of physical dormancy in the dormant fraction of C. ladanifer seeds. Two complementary processes seem to be in place in seeds response to fire. A direct fire-driven increase in germination of virtually all seeds in response to the appropriate heat load produced by fire or, in the absence of such heat loads, the germination of the non-dormant fraction provided that above-ground vegetation burns. |
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Seed germination in Cistus ladanifer: heat shock, physical dormancy, soil temperatures and significance to natural regenerationFogoGerminaçãoEstevaSeeds of Cistus ladanifer experience bursts of germination following fires. The effects of heat shock from 10 °C to 150 °C on seed germination were investigated by final germination plus the number of days required for germination to start and finish, and symmetry of cumulative germination. The occurrence of physical dormancy in C. ladanifer seeds was investigated by a variety of methods, including imbibition, scanning electron microscopy (SEM) and light microscopy, and use of dyes. The significance of responses of C. ladanifer seeds to fires was investigated essentially by abstracting existing literature and by using fire effects models and simulations. Parameters of germination were variously affected by heat treatments—positively in the range 80100 °C, negatively above 130 °C. Non-dormancy was consistently found in about 30% of seeds but no evidence was obtained to support the existence of physical dormancy in the dormant fraction of C. ladanifer seeds. Two complementary processes seem to be in place in seeds response to fire. A direct fire-driven increase in germination of virtually all seeds in response to the appropriate heat load produced by fire or, in the absence of such heat loads, the germination of the non-dormant fraction provided that above-ground vegetation burns.2019-03-14T17:36:44Z2019-03-142019-01-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10174/25379http://hdl.handle.net/10174/25379https://doi.org/10.3390/plants8030063engDias LS, Pereira IP, Dias AS 2019. Seed germination in Cistus ladanifer: heat shock, physical dormancy, soil temperatures and significance to natural regeneration. Plants 8, 63https://www.mdpi.com/2223-7747/8/3/63ICAAMndndalxandra@uevora.pt363Dias, L.S.Pereira, I.P.Dias, A.S.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-01-03T19:19:10Zoai:dspace.uevora.pt:10174/25379Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:15:51.351219Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Seed germination in Cistus ladanifer: heat shock, physical dormancy, soil temperatures and significance to natural regeneration |
title |
Seed germination in Cistus ladanifer: heat shock, physical dormancy, soil temperatures and significance to natural regeneration |
spellingShingle |
Seed germination in Cistus ladanifer: heat shock, physical dormancy, soil temperatures and significance to natural regeneration Dias, L.S. Fogo Germinação Esteva |
title_short |
Seed germination in Cistus ladanifer: heat shock, physical dormancy, soil temperatures and significance to natural regeneration |
title_full |
Seed germination in Cistus ladanifer: heat shock, physical dormancy, soil temperatures and significance to natural regeneration |
title_fullStr |
Seed germination in Cistus ladanifer: heat shock, physical dormancy, soil temperatures and significance to natural regeneration |
title_full_unstemmed |
Seed germination in Cistus ladanifer: heat shock, physical dormancy, soil temperatures and significance to natural regeneration |
title_sort |
Seed germination in Cistus ladanifer: heat shock, physical dormancy, soil temperatures and significance to natural regeneration |
author |
Dias, L.S. |
author_facet |
Dias, L.S. Pereira, I.P. Dias, A.S. |
author_role |
author |
author2 |
Pereira, I.P. Dias, A.S. |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Dias, L.S. Pereira, I.P. Dias, A.S. |
dc.subject.por.fl_str_mv |
Fogo Germinação Esteva |
topic |
Fogo Germinação Esteva |
description |
Seeds of Cistus ladanifer experience bursts of germination following fires. The effects of heat shock from 10 °C to 150 °C on seed germination were investigated by final germination plus the number of days required for germination to start and finish, and symmetry of cumulative germination. The occurrence of physical dormancy in C. ladanifer seeds was investigated by a variety of methods, including imbibition, scanning electron microscopy (SEM) and light microscopy, and use of dyes. The significance of responses of C. ladanifer seeds to fires was investigated essentially by abstracting existing literature and by using fire effects models and simulations. Parameters of germination were variously affected by heat treatments—positively in the range 80100 °C, negatively above 130 °C. Non-dormancy was consistently found in about 30% of seeds but no evidence was obtained to support the existence of physical dormancy in the dormant fraction of C. ladanifer seeds. Two complementary processes seem to be in place in seeds response to fire. A direct fire-driven increase in germination of virtually all seeds in response to the appropriate heat load produced by fire or, in the absence of such heat loads, the germination of the non-dormant fraction provided that above-ground vegetation burns. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-03-14T17:36:44Z 2019-03-14 2019-01-01T00:00:00Z |
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://hdl.handle.net/10174/25379 http://hdl.handle.net/10174/25379 https://doi.org/10.3390/plants8030063 |
url |
http://hdl.handle.net/10174/25379 https://doi.org/10.3390/plants8030063 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Dias LS, Pereira IP, Dias AS 2019. Seed germination in Cistus ladanifer: heat shock, physical dormancy, soil temperatures and significance to natural regeneration. Plants 8, 63 https://www.mdpi.com/2223-7747/8/3/63 ICAAM nd nd alxandra@uevora.pt 363 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799136640092864512 |