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	Provedor de dados Acta Botanica (5) Autor Fidelis,Alessandra (5) Baeza,M. Jaime (2) Daibes,Luís Felipe (2) Gorgone-Barbosa,Elizabeth (2) Fichino,Betânia (1) Martins,Aline Redondo (1) Novaes,Rafael B. (1) Pivello,Vânia (1) Pivello,Vânia R. (1) Pivello,Vânia Regina (1) Schmidt,Isabel (1) Zupo,Talita (1) Mais... Palavra-chave Cerrado (3) Germination percentage (2) Urochloa brizantha (2) Urochloa decumbens (2) African grasses (1) Brazilian Campos grasslands (1) Campo úmido (1) Cerrado grasses (1) Choque térmico (1) Fabaceae (1) Fire (1) Fire temperature (1) Fire-resistance (1) Fogo (1) Heat shock experiments (1) Invasive species (1) Mean germination time (1) Mediterranean Basin (1) Melinis minutiflora (1) Physical dormancy (1) Mais... Tipo do documento Info:eu-repo/semantics/article (3) Info:eu-repo/semantics/other (2) Ano 2020 (1) 2016 (3) 2012 (1) País Brazil (5) Idioma Inglês (4) Português (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 5 Primeira ... 1 ... Última Fire cues and germination of invasive and native grasses in the Cerrado Acta Botanica Gorgone-Barbosa,Elizabeth; Daibes,Luís Felipe; Novaes,Rafael B.; Pivello,Vânia Regina; Fidelis,Alessandra. ABSTRACT Fire-related cues may enhance seed recruitment in flammable ecosystems and differences in fire-germination responses of invasive vs. native species can drive the invasion process. We evaluated the effects of heat shock and smoke water solution treatment on seed germination of invasive (Melinis minutiflora, Urochloa decumbens, U. brizantha) and native grasses (Axonopus pressus, Aristida setifolia, Gymnopogon foliosus) of the Cerrado. The effect of fire temperature was tested by exposing seeds to heat shock treatments of 60, 100, and 200 °C for one minute, comparing them to untreated seeds. The effect of smoke was tested by soaking seeds for 24-h in an aqueous smoke comparing them to seeds soaked in distilled water. Differences among treatments were... Tipo: Info:eu-repo/semantics/article Palavras-chave: African grasses; Cerrado grasses; Fire temperature; Melinis minutiflora; Smoke solution; Urochloa brizantha; Urochloa decumbens. Ano: 2020 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000100185 Efeitos de altas temperaturas na germinação de sementes de capim-dourado (Syngonanthus nitens (Bong.) Ruhland, Eriocaulaceae): implicações para o manejo Acta Botanica Fichino,Betânia; Fidelis,Alessandra; Schmidt,Isabel; Pivello,Vânia. Este estudo teve por objetivo investigar potenciais efeitos do fogo na germinação de sementes de capim-dourado (Syngonanthus nitens) (Bong.) Ruhland (Eriocaulaceae). Sementes coletadas na região do Jalapão, Tocantins, foram submetidas a choques de temperaturas de 60º, 100 ºC, 150 ºC e 200 ºC durante 1, 3 e 5 minutos. Foram feitas 5 réplicas, com 20 sementes para cada tratamento, e controle. As sementes foram dispostas em placas de Petri e em câmaras de germinação a 28 ºC, fotoperíodo 12h/12h, por 40 dias. As taxas de germinação das sementes foram analisadas por meio de ANOVA com teste de aleatorização. A maioria dos tratamentos resultou em altas taxas de germinação (>85%), exceto 200ºC/3' (50%) e 200ºC/5', que apresentou uma queda significativa... Tipo: Info:eu-repo/semantics/article Palavras-chave: Campo úmido; Cerrado; Choque térmico; Fogo. Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062012000200026 The effect of simulated heat-shock and daily temperature fluctuations on seed germination of four species from fire-prone ecosystems Acta Botanica Zupo,Talita; Baeza,M. Jaime; Fidelis,Alessandra. ABSTRACT Seed germination in many species from fire-prone ecosystems may be triggered by heat shock and/or temperature fluctuation, and how species respond to such fire-related cues is important to understand post-fire regeneration strategies. Thus, we tested how heat shock and daily temperature fluctuations affect the germination of four species from fire-prone ecosystems; two from the Cerrado and two from the Mediterranean Basin. Seeds of all four species were subjected to four treatments: Fire (F), temperature fluctuations (TF), fire+temperature fluctuations (F+TF) and control (C). After treatments, seeds were put to germinate for 60 days at 25ºC (dark). Responses differed according to species and native ecosystem. Germination percentage for the Cerrado... Tipo: Info:eu-repo/semantics/other Palavras-chave: Cerrado; Mediterranean Basin; Mean germination time; Physical dormancy; Post-fire germination. Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000300514 Disturbance as a factor in breaking dormancy and enhancing invasiveness of African grasses in a Neotropical Savanna Acta Botanica Gorgone-Barbosa,Elizabeth; Pivello,Vânia R.; Baeza,M. Jaime; Fidelis,Alessandra. The Cerrado is threatened by wildfires and invasive species. We aimed to evaluate in laboratory conditions whether temperature fluctuation at the soil surface, resulting from the absence of vegetation due to fire, can affect the germination of Urochloa decumbens and U. brizantha, two invasive African grasses. Seeds of both species were submitted to simulations: 1) temperature during fire at 1cm belowground (F); 2) temperature fluctuation at 1cm belowground without vegetation cover for a month (TF); 3) (F) + (TF); 4) control at 25ºC. After treatments, seeds were put to germinate at 25ºC for 40 days. We had four replicates per treatment and three temporal replicates. We compared germination percentage and the mean germination time among treatments using... Tipo: Info:eu-repo/semantics/article Palavras-chave: Cerrado; Fire; Germination percentage; Invasive species; Physiological dormancy; Seed dormancy; Temperature fluctuation; Urochloa brizantha; Urochloa decumbens. Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000100131 To resist or to germinate? The effect of fire on legume seeds in Brazilian subtropical grasslands Acta Botanica Fidelis,Alessandra; Daibes,Luís Felipe; Martins,Aline Redondo. Fire plays an important role in several grassland ecosystems in the world. Fire can trigger germination in several species, by breaking the physical dormancy of their seeds. Thus, we hypothesized that exposure to high temperatures during fire would break seed dormancy and enhance germination. We tested the effect of high temperatures on the germination of six species of legumes from Brazilian subtropical grasslands. We used heat shock experiments with the following treatments: 60, 90, 120 and 150ºC for one minute. Seeds were then placed to germinate for 60 days in 12/12 hours light/dark and 20/30ºC. Germination was generally low for all study species. Most species was not affected by heat shock treatments. However, Stylosanthes montevidensis was the only... Tipo: Info:eu-repo/semantics/other Palavras-chave: Brazilian Campos grasslands; Fabaceae; Fire-resistance; Germination percentage; Heat shock experiments. Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000100147 Registros recuperados: 5 Primeira ... 1 ... Última

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