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

Cirne, Paulo; Miranda, Heloísa S.

doi:10.1590/s1677-04202008000300004

Cited by 37 publications

(46 citation statements)

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“…As a vegetation that is susceptible and conditioned by fire (Coutinho 1990), especially savannas and grasslands, this is another factor that can play selective pressure on fruit types in Cerrado. It has been demonstrated that fire increases nutrient cycling on soil and stimulates flowering and thus seed production in some Cerrado plants, such as Poaceae, Cyperaceae and Bromeliaceae (Munhoz & Felfili 2007), and that high temperatures caused by fire can also accelerate fruit drying and seed release and higher germinability in some species, like Kielmeyera coriacea, which have a coriaceous dry fruit (Cirne & Miranda 2008;Zaidan & Carreira 2008). However, there is still little information available about the fire effects on fruit production and germination of the Cerrado species, especially in woody plants (Palermo & Miranda 2012).…”

Section: Discussionmentioning

confidence: 99%

Evolution of seed dispersal in the Cerrado biome: ecological and phylogenetic considerations

Kuhlmann

Ribeiro

2016

Acta Bot. Bras.

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Th e investigation of the phylogeny of a group of organisms has the potential to identify ecological and evolutionary processes that have been occurring within a community. Seed dispersal is a key process in the life cycle of vegetation and refl ects diff erent reproductive strategies of plants to a set of ecological and evolutionary factors. Knowing the dispersal syndromes and fruits types of a plant community may help elucidate plant-animal interactions and colonization strategies of plants. We investigated dispersal syndromes and fruit types in Cerrado formations as a parameter for understanding the evolution of angiosperm reproductive strategies in this mega-diverse tropical biome. To do this we identifi ed and mapped the distribution of diff erent parameters associated with seed dispersal on a phylogeny of Cerrado angiosperms genera and tested the presence of phylogenetic signal. Th e results showed that there were strong relationships between fruit types, seed dispersal strategies and vegetation life forms and that these traits were closely related to angiosperms phylogeny and, together, contribute to the evolution of plants in the forest, savanna and grassland formations of the Cerrado biome.

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Section: Discussionmentioning

confidence: 99%

Evolution of seed dispersal in the Cerrado biome: ecological and phylogenetic considerations

Kuhlmann

Ribeiro

2016

Acta Bot. Bras.

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“…Fire may also accelerate fruit drying and thus anticipate the release of the seeds, as recently described in fruits of Kielmeyera coriacea Mart. (Cirne and Miranda 2009). During the fire, fruit surface temperatures as high as 720 o C were measured but maximum internal fruit temperatures were around 60 o C. Mature fruits of K. coriacea have high water content and the evaporation of moisture during exposition to the flames or to the hot air prevent internal temperature from rising above 100 o C until the fruit tissue has dried.…”

Section: Discussionmentioning

confidence: 99%

Seed germination in Cerrado species

Zaidan

Carreira

2008

Braz. J. Plant Physiol.

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The aim of this review is to comment on the available data about germination of seeds from herb, shrub and tree species of the Cerrado after the publication of the review written by Felippe and Silva in 1984. Studies on seed germination of herbaceous species focused mainly on the responses of seeds to light, different ranges of temperature and storage in the soil. The majority of seeds from herb species germinate between 20°C and 30°C, and are photoblastic. Alternate temperatures favored germination in some seeds, but changed light sensitivity of the achenes of Bidens gardneri. Seeds of most of the shrub species of Melastomataceae are positive photoblastic; among the Velloziaceae, germination in the dark was observed in some species. Other shrub species show dormancy caused by impermeability of the seed tegument, as described for seeds of some species of Bauhinia. Their dormancy is broken by chemical scarification using sulphuric acid. Seeds of Heteropterys pteropetala are sensitive to very high temperatures, similar to those registered during burnings. Some species were considered to have allelopathic effects and could inhibit the germination of seeds of other species and the establishment of plantlets. Seeds of most tree species do not require light to germinate and the focus of the studies were on methods of dormancy breaking. Sulphuric acid and incisions in the tegument proved to be the most efficient methods to break dormancy. In general, the studies are limited to three major aspects: responses to light, effects of different temperatures and dormancy breaking. More studies are necessary to understand the physiological and biochemical aspects of reserve compounds and their mobilization during germination, as well as the effects of fire in these seeds. Key words: dormancy, photoblastism, soil seed bank, temperature Germinação de sementes de espécies de Cerrado: O objetivo desta revisão é comentar dados disponíveis sobre a germinação de sementes de espécies herbáceas, arbustivas e arbóreas do Cerrado, desde a publicação da revisão feita por Felippe e Silva na década de 1980. Estudos de germinação de sementes de espécies herbáceas do Cerrado enfatizam as respostas das sementes à luz, temperatura e armazenamento no solo. A maioria dessas sementes germina entre 20ºC e 30ºC e são fotoblásticas. Temperaturas alternadas nem sempre favoreceram a germinação das sementes, no entanto, alteraram a sensibilidade à luz em aquênios de Bidens gardneri. A maioria das sementes das espécies arbustivas de Melastomataceae estudadas apresentaram fotoblastismo positivo; entre as Velloziaceae, foi observada germinação no escuro em algumas espécies. Sementes de algumas espécies arbustivas possuem dormência causada pela impermeabilidade do tegumento, quebrada com imersão em ácido sulfúrico, como no gênero Bauhinia. Sementes de Heteropterys pteropetala são sensíveis a temperaturas altas, similares àquelas registradas durante as queimadas. Plantas de algumas espécies têm efeitos alelopáticos e podem inibir a germinação de sementes de o...

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“…Tal resultado coincide com os registrados em estudos anteriores para Kielmeyera speciosa (Oliveira & Silva 1993;Cirne & Miranda 2008) e Kielmeyera coriacea (Ribeiro et al 1985;Oliveira & Silva 1993;Cirne & Miranda 2008) que apresentaram pico de dispersão de sementes no final da estação seca.…”

Section: Discussionunclassified

“…Estudos anteriores com sementes de Kielmeyera coriacea obtiveram porcentagens de germinação superiores a 60% a 25 °C e fotoperíodo de 12 horas (Oliveira & Silva 1993;Cirne & Miranda 2008). Santana et al (2010) (Melo et al 1979;Botelho & Carneiro 1992;Coelho et al 1997).…”

Section: Discussionunclassified

“…A espécie apresenta inflorescências racemosas, flores melitófilas albo-róseas com estames de cor amarela intensa originando frutos na forma de cápsulas septicidas de onde, após a deiscência, são dispersas sementes anemocóricas aladas. Estudos recentes abordaram a fenologia (Ribeiro et al 1985;Oliveira & Sazima 1990, Oliveira & Moreira 1992Oliveira & Silva 1993;Batalha & Mantovani 1999Barros 2002;Lenza & Klink 2006;Cirne & Miranda 2008), biologia reprodutiva (Oliveira & Sazima 1990;Oliveira & Moreira 1992;Oliveira & Silva 1993) e germinação (Botelho & Carneiro 1992;Oliveira & Silva 1993;Coelho et al 1997;Cirne & Miranda 2008;Melo et al 1979;Nardoto et al 1998;Moreira & Klink 2000;Santana et al 2010) de espécies do gênero Kielmeyera que ocorrem no cerrado sensu stricto. No entanto, apesar de importante nas fisionomias rochosas dos campos rupestres dentro do bioma Cerrado, nenhuma espécie de Kielmeyera ocorrente nesses ambientes havia sido estudada.…”

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Fenologia reprodutiva, sazonalidade e germinação de Kielmeyera regalis Saddi (Clusiaceae), espécie endêmica dos campos rupestres da Cadeia do Espinhaço, Brasil

et al. 2012

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RESUMO(Fenologia reprodutiva, sazonalidade e germinação de Kielmeyera regalis Saddi (Clusiaceae), espécie endêmica dos campos rupestres da Cadeia do Espinhaço, Brasil). A fenologia reprodutiva e a germinação de sementes foram estudadas em uma população de Kielmeyera regalis da Serra do Cipó, MG. Foram calculados os índices de atividade e intensidade de produção de botões, flores, frutos imaturos e frutos maduros ao longo de 2001. A influência do clima sobre a fenologia foi avaliada por Análise de Correspondência Canônica (CCA). A germinação foi avaliada a temperaturas constantes de 15-35 °C (com intervalos de 5 °C) em câmaras de germinação com fotoperíodo de 12 h. A variância dos dados explicada pela CCA foi de 72,8%. A temperatura média do ar, evaporação e radiação solar global apresentaram altos coeficientes de correlação com a fenologia. O florescimento ocorreu nos meses quentes e úmidos, a maturação de frutos se estendeu na estação seca e fria, e a dispersão das sementes, logo antes da estação chuvosa. A germinabilidade foi superior a 80% nas temperaturas de 20-30 °C, faixa ocorrente no período chuvoso logo após a dispersão das sementes. Comparações com outros estudos indicam que a dispersão e rápida germinação nesses períodos são fortes fatores adaptativos dentro do gênero. Os resultados são importantes para a compreensão dos fatores que afetam o sucesso reprodutivo e expansão populacional, e devem ser considerados para ações de manejo desta espécie rupestre endêmica.Palavras-chave: análise de correspondência canônica, clima, conservação, dispersão de sementes, Serra do Cipó ABSTRACT (Reproductive phenology, seasonality and germination of Kielmeyera regalis Saddi (Clusiaceae), a species endemic to rock outcrops in the Espinhaço Range, Brazil). The reproductive phenology and seed germination of a Kielmeyera regalis population, from Serra do Cipó (MG), Brazil, were studied. During 2001, the intensity and activity indices were calculated to estimate production of flower buds, flowers, and immature and mature fruits. Influence of the climate on phenology was determined by a Canonical Correspondence Analysis (CCA). Germination was studied under a 12 h photoperiod at seven fixed temperatures (15-35°C at 5°C intervals). The CCA explained 72.8% of the phenological data variation. The highest correlation coefficients with phenology were observed for mean air temperature, evaporation and solar global radiation. Flowering occurred during the hot and wet season, fruit maturation extended during the entire cold and dry season, and seed dispersal peaked before the onset of the rainy season. Germinability reached values above 80% under temperatures of 20-30°C, which occurred during the rainy period, just after seed dispersal. The results of this and other studies indicate that seed dispersal just before the rainy season, and fast germination at the beginning of the rainy season, are highly adaptive traits within the genus. In addition, the results provide important information for understanding basic factors that affect r...

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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

Cited by 37 publications

References 32 publications

Evolution of seed dispersal in the Cerrado biome: ecological and phylogenetic considerations

Evolution of seed dispersal in the Cerrado biome: ecological and phylogenetic considerations

Seed germination in Cerrado species

Fenologia reprodutiva, sazonalidade e germinação de Kielmeyera regalis Saddi (Clusiaceae), espécie endêmica dos campos rupestres da Cadeia do Espinhaço, Brasil

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