Physiological, physical, and morpho-anatomical changes in Libidibia ferrea ((Mart. ex Tul.) L.P. Queiroz) seeds after overcoming dormancy

César, Antônio; Matos, Antônio César Batista; Ataíde, Glauciana da Mata; Lima, Eduardo Euclydes de

doi:10.1590/2317-1545v37n1140433

Cited by 13 publications

(10 citation statements)

References 16 publications

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“…While there have been numerous studies of germination in species of the Mimosoideae and Caesalpinioideae, few have specifically investigated the initial imbibition phase of the process (e.g. Clemens et al ., 1977; Wilson and Witkowski, 1998; Funes and Venier, 2006; Commander et al ., 2009; Venier et al ., 2012; Pound et al ., 2014; Matos et al ., 2015; Jaganathan et al ., 2017, 2018; Suleiman et al ., 2018). Most of these studies have been of control and mechanically scarified seeds over relatively short time frames (e.g.…”

Section: Introductionmentioning

confidence: 99%

Markedly different patterns of imbibition in seeds of 48 Acacia species

2019

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The seeds of most Australian acacias have pronounced physical dormancy (PY). While fire and hot water (HW) treatments cause the lens to ‘pop’ almost instantaneously, for many Acacia species the increase in germination percentage can be gradual. If PY is broken instantly by HW treatment, why is germination often an extended process? Control and HW treatments were performed on seeds of 48 species of Acacia. Seeds were placed on a moist substrate and imbibition was assessed by frequently weighing individual seeds. In the two soft-seeded species all control seeds were fully imbibed within 6–24 h, while in hard-seeded species very few control seeds imbibed over several weeks. In 10 species over 50% of the HW-treated seeds imbibed within 30 h, but mostly the percentage of imbibed seeds gradually increased over several weeks. Some seeds in a replicate would imbibe early, while others would remain unimbibed for many days or weeks then, remarkably, become fully imbibed in less than 24 h. While HW treatment broke PY almost instantaneously, it appeared that in many Acacia species some other part of the testa slowed water from reaching the embryo. This process of having staggered imbibition may be a way of ensuring not all seeds in a population germinate after small rain events. Thus it appears the lens acts as a ‘fire gauge’ while some other part of the seed coat acts as a ‘rain gauge’.

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Section: Introductionmentioning

confidence: 99%

Markedly different patterns of imbibition in seeds of 48 Acacia species

2019

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“…necessárias sobre a variação fenológica entre espécies de um mesmo gênero ou que se desenvolveram em condições ambientais diferenciadas (CRUZ et al, 2001;GUSMÃO et al, 2006;ALVES et al, 2007;CARVALHO, 2008;SANTOS et al, 2012;GONÇALVES et al, 2013;SILVA et al, 2014;DUARTE et al, 2015;MATOS et al, 2015;GOMES et al, 2016;PIRES NETO et al, 2016;SILVA et al, 2017;Santos et al, 2018;Santos et al, 2019), além de possibilitar maior aprimoramento na germinação e vigor das sementes NAKAGAWA, 2012;DUARTE et al, 2016).…”

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“…Algumas espécies florestais não são capazes de germinar e/ou produzir plântulas normais, mesmo em condições ambientais favoráveis, o que desencadeia um mecanismo natural que retarda a germinação das sementes por consequência da restrição à entrada de água através do tegumento, processo este conhecido por dormência, dificultando o planejamento na produção de mudas para os programas de reflorestamento (BEWLEY; BLACK, 1994;NAKAGAWA, 2012;MATOS et al, 2015;ABREU et al, 2017). De maneira prática, existem diferentes métodos para superar a dormência tegumentar das sementes, entre os quais se podem destacar: a escarificação química, escarificação mecânica e a exposição a altas temperaturas (COSTA et al, 2013;MONTANHA et al, 2018;SANTOS et al, 2019).…”

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BIOMETRIA DE FRUTOS E SEMENTES E TRATAMENTOS PRÉ-GERMINATIVOS EM SEMENTES DE Hymenaea courbaril

Santos¹,

Silva²,

Costa³

et al. 2019

Rev. Agro. Amb.

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RESUMO: A caracterização de frutos e sementes de espécies florestais é fundamental para o conhecimento das condições ideais de germinação e seu uso na revegetação de ambientes degradados. Este trabalho teve por objetivo caracterizar biometricamente frutos e sementes e definir o método adequado para superação de dormência das sementes de Hymenaea courbaril. Foram mensurados comprimento, largura, espessura e massa de frutos e sementes, sendo posteriormente, as sementes submetidas aos seguintes tratamentos pré-germinativos: sementes sem tratamento (controle); ácido sulfúrico por 10; 20 e 30 minutos; escarificação mecânica; e imersão em água quente a 100 °C até resfriamento. Os dados biométricos foram submetidos à análise estatística descritiva e distribuição de frequência. Ao longo da germinação foram avaliadas a percentagem, índice de velocidade e tempo médio de germinação. Constatou-se que 15% da biomassa dos frutos foram alocadas para as sementes, 72% na casca e 13% na polpa farinácea. Os métodos pré-germinativos da escarificação química durante 30 minutos e mecânica apresentaram 80% e 93% da germinação, respectivamente. Os frutos e sementes de H. courbaril apresentaram ampla variação biométrica e de biomassa, o que constitui características importantes na germinação das sementes. Entre as classes, a biomassa variou entre 2,90 a 4,34 g. Os tratamentos que apresentaram germinação satisfatória foram ácido sulfúrico e lixa.ABSTRACT: Fruit and seed characterization of forest species is crucial for ideal germination conditions and its use in the re-vegetation of degraded environments. Current research characterizes biometrically fruits and seeds and defines the method to overcome dormancy of Hymenaea courbaril seed. Length, width, thickness, mass of fruit and seeds were measured. Seeds underwent the following pre-germination treatments: seeds without any treatment (control); sulfuric acid for 10, 20 and 30 minutes; mechanical scarification; immersion in hot water at 100 °C until cooling. Biometric data underwent descriptive statistical analysis and frequency distribution. Percentage, speed index and mean germination period were assessed throughout germination. Results show that 15% of fruit biomass were allocated to seeds, namely, 72% in the rind and 13% in the pulp. Pre-germination method of chemical and mechanical scarification during 30 minutes provided 80 and 93% of germination, respectively. Fruits and seeds of H. courbaril provided a wide biometric and biomass variation, forming important characteristics in seed germination. Biomass varied between 2.90 and 4.34 g. Treatment with satisfactory germination were sulfuric acid and sandpaper.KEY WORDS: Allocation of biomass; Dormancy; Forest seeds. INTRODUÇÃOA espécie arbórea Hymenaea courbaril Linnaeus, conhecida como jatobá, jutaí ou jataí, pertencente à família Fabaceae e ultimamente tem despertado o interesse de estudiosos e pesquisadores por possuir características de interesse econômico para medicina popular, alimentação, construção civil, entre outras. A espéci...

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“…ex Tul.) LP Queiroz) had good results with sulfuric acid for 20 and 40 min (Matos et al, 2015). Samanea tubulosa (Benth.)…”

Section: Resultsmentioning

confidence: 98%

Influence of pre-germination treatments on germination seed in Melanoxylon brauna Schott

Freire¹,

Sousa²,

AtaÃde³

et al. 2017

Afr. J. Agric. Res.

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This study evaluated the presence of integument dormancy in Melanoxylon brauna seeds by testing the influence of nine pre-germination treatments on seed germination compared to a control (no pregermination) treatment. Pre-germination treatments include; immersion in sulfuric acid for 5 min, 10 min, 15 min and 30 min, hot water at 80°C without soaking, hot water at 80°C with soaking for 30 min, 90 min, 24 h, and mechanical scarification. The experiment consisted of a completely randomized design, with four replicates and 25 seeds per experimental unit. Percentage germination, germination speed, number of normal and abnormal seedlings, and mortality rate were evaluated. Seeds began to germinate at four days, and germination varied from 33 to 89%, with the highest percentage found in hot water with or without soaking for 30 min, which not differed statistically from control. Immersion in sulfuric acid for longer than 10 min reduced seed germination and increased mortality rate. We conclude that M. brauna seeds do not undergo seed dormancy, and there is no need to apply pregerminating treatments to its seeds.

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Physiological, physical, and morpho-anatomical changes in Libidibia ferrea ((Mart. ex Tul.) L.P. Queiroz) seeds after overcoming dormancy

Cited by 13 publications

References 16 publications

Markedly different patterns of imbibition in seeds of 48 Acacia species

Markedly different patterns of imbibition in seeds of 48 Acacia species

BIOMETRIA DE FRUTOS E SEMENTES E TRATAMENTOS PRÉ-GERMINATIVOS EM SEMENTES DE Hymenaea courbaril

Influence of pre-germination treatments on germination seed in Melanoxylon brauna Schott

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