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Effects of prescribed fires on the survival and release of seeds of Kielmeyera coriacea (Spr.) Mart. (Clusiaceae) in savannas of Central Brazil

Effects of prescribed fires on survival and release of seeds of the woody species Kielmeyera coriacea (Clusiaceae) were investigated in two plots of cerrado sensu stricto, a savanna vegetation of Central Brazil. The first plot was burnt in June, at the beginning of the dry season, and the second in...

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Main Authors: Cirne, Paulo, Miranda, Heloisa Sinátora
Format: Artigo
Language: English
Published: Brazilian Journal of Plant Physiology 2017
Subjects:
Cerrado
fire season
fruit temperature
seed release
Fogo
temperatura do fruto
Germinação
dispersão de sementes
Online Access: http://repositorio.unb.br/handle/10482/27382
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spelling ir-10482-273822019-03-28T14:09:23Z Effects of prescribed fires on the survival and release of seeds of Kielmeyera coriacea (Spr.) Mart. (Clusiaceae) in savannas of Central Brazil Efeito de queimadas prescritas na sobrevivência e dispersão de sementes de Kielmeyera coriacea (Spr.) Mart. (Clusiaceae) em áreas de cerrado sensu stricto Cirne, Paulo Miranda, Heloisa Sinátora Cerrado fire season fruit temperature seed release Cerrado Fogo temperatura do fruto Germinação dispersão de sementes Effects of prescribed fires on survival and release of seeds of the woody species Kielmeyera coriacea (Clusiaceae) were investigated in two plots of cerrado sensu stricto, a savanna vegetation of Central Brazil. The first plot was burnt in June, at the beginning of the dry season, and the second in August, in the middle of the dry season. Seed survival was measured after fire in both areas and related to internal and external fruit temperatures measured during the June fire. The proportion of open fruits per individual of K. coriacea was also assessed at two-week intervals. Maximum external temperatures during fire (393 to 734ºC) were strongly reduced inside the fruits (61 to 63ºC). Before the June fire, the majority of the fruits were closed in both plots. Most fruits in the June plot opened within two weeks following the burning while, in the same period, most fruits remained closed in the August plot. Fifteen days after the prescribed fire in the August plot most fruits opened, as observed in the June plot. No germination was observed in seeds from closed fruits collected before the fire, while those from fruits that were closed during the burning showed a high mean germination rate (June = 79 ± 12%; August = 69 ± 14%). The results indicate that fruits of K. coriacea are good insulators for seeds during fires and that seed release is anticipated independently of the burning season. Os efeitos de queimadas prescritas na sobrevivência e na dispersão de sementes de Kielmeyera coriacea (Clusiaceae) foram investigados em duas parcelas de cerrado sensu stricto, uma queimada no início da estação seca (junho) e outra, em agosto, meio da estação seca. A sobrevivência das sementes após as queimadas foi relacionada às temperaturas externa e interna dos frutos medidas durante a queimada de junho. A proporção de frutos abertos por indivíduos de K. coriacea foi observada quinzenalmente. As temperaturas externas máximas durante a passagem do fogo (393 a 734ºC) foram fortemente reduzidas dentro dos frutos (61 a 63ºC). Nas duas parcelas, a maior parte dos frutos estava fechada antes da queimada realizada em junho. Cerca de 60% dos frutos observados na parcela queimada em junho abriram nas duas semanas após a queimada sendo que, no mesmo período, a maior parte dos frutos na parcela a ser queimada em agosto permaneceu fechada. Da mesma forma, nas duas semanas seguintes à queimada realizada em agosto, foi observada a abertura da maioria dos frutos. Nenhuma semente dos frutos coletados antes das queimadas germinou. Entretanto, foi alta a germinação das sementes coletadas dos frutos que estavam fechados durante as queimadas (junho = 79 ± 12%; agosto = 69 ± 14%). Os resultados indicam que os frutos de K. coriacea oferecem boa proteção para as sementes durante as queimadas e que, independentemente da época da queima, a dispersão das sementes é antecipada pela passagem do fogo. 2017-12-07T04:50:21Z 2017-12-07T04:50:21Z 2008 Artigo Braz. J. Plant Physiol.,v.20,n.3,p.197-204,2008 1677-0420 http://repositorio.unb.br/handle/10482/27382 10.1590/S1677-04202008000300004 en Acesso Aberto application/pdf Brazilian Journal of Plant Physiology http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000300004&lng=en&nrm=iso http://www.scielo.br/scielo.php?script=sci_abstract&pid=S1677-04202008000300004&lng=en&nrm=iso http://www.scielo.br/scielo.php?script=sci_pdf&pid=S1677-04202008000300004&lng=en&nrm=iso
institution REPOSITORIO UNB
collection REPOSITORIO UNB
language English
topic Cerrado
fire season
fruit temperature
seed release
Cerrado
Fogo
temperatura do fruto
Germinação
dispersão de sementes
spellingShingle Cerrado
fire season
fruit temperature
seed release
Cerrado
Fogo
temperatura do fruto
Germinação
dispersão de sementes
Cirne, Paulo
Miranda, Heloisa Sinátora
Effects of prescribed fires on the survival and release of seeds of Kielmeyera coriacea (Spr.) Mart. (Clusiaceae) in savannas of Central Brazil
description Effects of prescribed fires on survival and release of seeds of the woody species Kielmeyera coriacea (Clusiaceae) were investigated in two plots of cerrado sensu stricto, a savanna vegetation of Central Brazil. The first plot was burnt in June, at the beginning of the dry season, and the second in August, in the middle of the dry season. Seed survival was measured after fire in both areas and related to internal and external fruit temperatures measured during the June fire. The proportion of open fruits per individual of K. coriacea was also assessed at two-week intervals. Maximum external temperatures during fire (393 to 734ºC) were strongly reduced inside the fruits (61 to 63ºC). Before the June fire, the majority of the fruits were closed in both plots. Most fruits in the June plot opened within two weeks following the burning while, in the same period, most fruits remained closed in the August plot. Fifteen days after the prescribed fire in the August plot most fruits opened, as observed in the June plot. No germination was observed in seeds from closed fruits collected before the fire, while those from fruits that were closed during the burning showed a high mean germination rate (June = 79 ± 12%; August = 69 ± 14%). The results indicate that fruits of K. coriacea are good insulators for seeds during fires and that seed release is anticipated independently of the burning season.
format Artigo
author Cirne, Paulo
Miranda, Heloisa Sinátora
author_sort Cirne, Paulo
title Effects of prescribed fires on the survival and release of seeds of Kielmeyera coriacea (Spr.) Mart. (Clusiaceae) in savannas of Central Brazil
title_short Effects of prescribed fires on the survival and release of seeds of Kielmeyera coriacea (Spr.) Mart. (Clusiaceae) in savannas of Central Brazil
title_full Effects of prescribed fires on the survival and release of seeds of Kielmeyera coriacea (Spr.) Mart. (Clusiaceae) in savannas of Central Brazil
title_fullStr Effects of prescribed fires on the survival and release of seeds of Kielmeyera coriacea (Spr.) Mart. (Clusiaceae) in savannas of Central Brazil
title_full_unstemmed Effects of prescribed fires on the survival and release of seeds of Kielmeyera coriacea (Spr.) Mart. (Clusiaceae) in savannas of Central Brazil
title_sort effects of prescribed fires on the survival and release of seeds of kielmeyera coriacea (spr.) mart. (clusiaceae) in savannas of central brazil
publisher Brazilian Journal of Plant Physiology
publishDate 2017
url http://repositorio.unb.br/handle/10482/27382
_version_ 1641988493115654144
score 13.657419

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