How and why to measure the germination process?

Ranal, Marli A.; Santana, Denise Garcia de

doi:10.1590/s0100-84042006000100002

Cited by 610 publications

(511 citation statements)

References 33 publications

(54 reference statements)

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“…Seeds with a minimum of 2 mm of root protrusion were considered to have germinated (Ferreira and Aquila, 2000). Germination (G), germination speed index (GSI), and average germination time (GMT) were assessed according to the recommendations of Ranal and Santana (2006).…”

Section: Germination Bioassaysmentioning

confidence: 99%

AUTOTOXICITY IN TOUGH LOVEGRASS ( Eragrostis plana )

2017

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ISSN 0100-8358 (print) 1806-9681 (online) AUTOTOXICITY IN TOUGH LOVEGRASS (Eragrostis plana) Autotoxicidade em Capim-annoni (Eragrostis plana)ABSTRACT -Autotoxicity in tough lovegrass has been analyzed in the field, but has never been tested in allelopathy bioassays. Therefore, this study aimed to verify and compare the autotoxicity of leaves and roots from aqueous extracts of tough lovegrass on its germination and early seedling growth. Extracts of green leaves (GL), senescent leaves (SL), and roots (R) at concentrations of 0.05, 0.15, and 0.25 g mL -1 were analyzed on how they affected seed germination and seedling growth. The extracts, regardless of the source or concentration of the material used, have significantly reduced germination percentage, index of germination speed, and root growth of seedlings of tough lovegrass. Effects on mean germination time and shoot length varied according to the origin and concentration of the extracts. GL, at concentrations 0.15 and 0.25 g mL -1 , showed the most damaging effect. In tough lovegrass, autotoxicity is a mechanism that may be involved in the control of germination and plant growth, which could explain the distance between their clumps in the field.Keywords: allelopathy, aqueous extracts, Eragrostis plana, germination. RESUMO -A autotoxicidade no capim-annoni é observada no campo, mas nunca

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Section: Germination Bioassaysmentioning

confidence: 99%

AUTOTOXICITY IN TOUGH LOVEGRASS ( Eragrostis plana )

2017

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“…For all analyzes, we excluded the feces samples from recaptures of the same individuals, thus avoiding pseudo-replicates (Hurlbert 1984). We used the terms germinability (the final proportion of germinated seeds) and mean germination time (the mean time of germination of the faster seeds) to examine seed germination (Ranal & Santana 2006;Robertson et al 2006).…”

Section: Germination Testsmentioning

confidence: 99%

Effects of gut passage on the germination of seeds ingested by didelphid marsupials in a neotropical savanna

2013

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We analyzed the effects that passage through the guts of seven didelphid species had on the seed germination of 10 plant species. This study was conducted in an area of riparian woodland in a cerrado (savanna) reserve in southeastern Brazil. We found seeds of 23 angiosperm species in 427 fecal samples obtained from seven didelphid species. The plant families most often represented by the seeds found in the fecal samples were Melastomataceae (5 species) and Rubiaceae (4 species) . Most gut-passed seeds showed no significant difference in germinability when compared with the hand-extracted seeds. Among the ingested seeds, only those of Clidemia urceolata DC. (Melastomataceae) and Myrcia sp. (Myrtaceae) showed an increase in germinability (final proportion of germinated seeds), indicating that didelphid gut passage does not always benefit seed germination. The average germination time of consumed seeds ranged from 12 days (Cipocereus minensis (Werderm.) Ritter) to 171 days (Cordiera sessilis (Vell.) Kuntze). The small number of seeds destroyed after gut passage and the results obtained during the germination experiments underscore the importance of didelphid marsupials to the dynamics of plant reproduction, especially those of small--seeded cerrado species.

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“…Foi verificada a ocorrência de germinação a cada 24 horas durante 70 dias, com o auxílio de um microscópio estereoscópio, sendo a emergência da radícula o critério adotado para a germinação (Bewley & Black 1994). Foram calculados a porcentagem total de germinação e o Índice de Velocidade de Emergência da Radícula (IVE) (Ranal & Santana 2006) de acordo com a seguinte fórmula: IVE = Σ (Nn/Dn) onde: Nn = número de sementes germinadas no enésimo dia de contagem; Dn = enésimo dia de contagem.…”

Section: Methodsunclassified

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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How and why to measure the germination process?

Cited by 610 publications

References 33 publications

AUTOTOXICITY IN TOUGH LOVEGRASS ( Eragrostis plana )

AUTOTOXICITY IN TOUGH LOVEGRASS ( Eragrostis plana )

Effects of gut passage on the germination of seeds ingested by didelphid marsupials in a neotropical savanna

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

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