Superação de dormência e metodologias para testes de germinação em sementes de Trifolium riograndense Burkart e Desmanthus depressus Humb

Suñé, Ana Dias; Franke, Lucia Brandão

doi:10.1590/s0101-31222006000300005

Cited by 21 publications

(10 citation statements)

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“…Therefore, the optimum temperature for this species falls within this range, which provided high germination and shorter mean germination times. Suñé and Franke (2006) reported higher optimal temperatures of around 25 °C for Trifolium riograndense in relation to Lotus subbiflorus. However, in the L. subbiflorus species, a constant temperature of 20 ºC enabled seeds to express greater germination potential (Lopes and Franke, 2011).…”

Section: Resultsmentioning

confidence: 93%

“…This type of dormancy can be overcome through treatments that weaken or rupture the integument, allowing water absorption and the onset of germination (Mayer and Poljakoff-Mayber, 1989). Immersion in hot water for a few minutes, mechanical scarification with sandpaper, and chemical scarification with sulfuric acid (Brasil, 2009) are methods successfully used to overcome seed dormancy in species such as Lotus subbiflorus (Jacob Junior et al, 2004), Trifolium riograndense and Desmanthus depressus (Suñé and Franke, 2006), Macroptilium lathyroides (Vasconcelos et al, 2011), and Trifolium glomeratum (Martín and Guerrero, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Overcoming dormancy and determining optimal temperature for slender serradella seed germination

et al. 2015

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-The objective of this study was to identify the most efficient method for overcoming coat-imposed dormancy and determine the optimal germination temperature for Ornithopus pinnatus seeds. Treatments to overcome dormancy were: intact seeds; immersion in hot water at 60 ºC, followed by soaking in the same water (unheated)/24 h; immersion in hot water at 90 ºC, followed by soaking in the same water (unheated)/24 h; mechanical scarification; chemical scarification, H 2 SO 4 /5 min; and chemical scarification, H 2 SO 4 /10 min. Percentages were calculated for germinated, abnormal, dormant, and dead seeds. Optimal germination temperatures were calculated using eight constant temperatures (0, 5, 10, 15, 20, 25, 30, and 35 °C), with 8 h of light and 16 h of darkness. Germination rate, frequency, and synchronization index of germination were used as parameters to establish optimum temperature for germination. A completely randomized experimental design was used, with twelve repetitions of 100 seeds per treatment. Data obtained were subjected to analysis of variance and Tukey's test at a 5% significance level. O. pinnatus seeds exhibit dormancy caused by the seed coat's impermeability to water. Mechanical scarification was efficient in promoting seed germination. The species is stenothermal, meaning it cannot tolerate significant temperature variations. The germination rate of seeds was linearly dependent on temperature. Synchronization of the germination process is greater in the optimum temperature range, established between 15 and 20 °C.

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Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Overcoming dormancy and determining optimal temperature for slender serradella seed germination

et al. 2015

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“…Portanto, a temperatura ótima para esta espécie encontra-se nesta faixa, que proporcionou alta germinabilidade e menor tempo médio de germinação. Suñé & Franke (2006) (Suñé & Franke, 2001). A velocidade de germinação das sementes apresentou-se linearmente dependente da temperatura.…”

Section: Resultsunclassified

Aspectos térmico-biológicos da germinação de sementes de cornichão anual sob diferentes temperaturas

Lopes

Franke

2011

R. Bras. Zootec.

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RESUMO -O objetivo neste trabalho foi determinar as temperaturas mínima, ótima e máxima para a germinação de sementes de Lotus subbiflorus Lag. utilizando-se como parâmetros a porcentagem, a velocidade, a frequência, a entropia informacional de germinação e a entalpia líquida de ativação. O experimento foi realizado em dois lotes com quatro subamostras, cada uma de 100 sementes, e os dados obtidos foram submetidos à análise de variância e ao teste de Tukey. Foram utilizadas oito temperaturas constantes (0, 5, 10, 15, 20, 25, 30 The enthalpy value of the system was calculated, reaching its minimum point at 278 K, and its maximum, at 303 K; the point at which the curve crossed the absciss axis was 290.5 K.

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“…Piptochaetium montevidense, Trifolium riograndense and Vulpia bromoides, as many other native species, are not included in these Rules. Thus, we decided to use similar parameters for them as are given for other species from the same genus by various authors (Brasil 2009;Suñé & Franke 2006;Fochesato et al 2000). Seeds were tested in a germination chamber with 8 hours light and 16 hours dark cycle.…”

Section: Experimental Setup and Monitoringmentioning

confidence: 99%

Emergence and establishment of native and non-native species in soils of remnant and converted highland grasslands – southern Brazil

2017

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MÜLLER, H.L., LOPES, R. R., HERMANN, J. M. Emergence and Establishment of native and non-native species in soils of remnant and converted highland grasslands -southern Brazil. Biota Neotropica. 17(1): e20160235. http://dx.doi.org/10.1590/1676-0611- BN-2016-0235 Abstract: Native grasslands in the Campos de Cima da Serra, Brazil, are being converted at speed for exotic tree plantations and cropland. The impact of modified and novel soil conditions on the establishment of native grassland species is unknown; establishment of non-native species, deliberately or accidentally introduced, could be favoured. In a common garden composed of fully randomized replicate samples of soils collected from remnant grassland, former cropland and pine plantations, we tested emergence and establishment of five cold-season species: Native low-tussock grass Piptochaetium montevidense (Spreng.) Parodi; native legume Trifolium riograndense Burkart; naturalized low-tussock grass Vulpia bromoides (L.) Gray; low-tussock grass Holcus lanatus L., cultivated and naturalized in Brazil; and a cultivar of non-native Trifolium repens. Other than expected, soil type and species*soil type interactions had no significant effect on seedling emergence after 132 days in the field. Species effect on seedling emergence, however, was highly significant. Vulpia bromoides emergence was significantly highest in all soil types. Holcus lanatus and Trifolium riograndense both achieved second highest emergence rates and did not differ significantly from each other. Lowest overall emergence rates were found in the non-native clover cultivar. Lab germination tests failed for Piptochaetium, although it showed reasonable emergence in the field. Good performance of the native clover is encouraging for future grassland restoration, but the value of highly germinable Vulpia as a forage remains to be tested. Holcus tolerates a wide range of soil conditions and its life history traits may promote naturalization, or even invasiveness. Native grasslands of the region should be monitored for this species. Studies like these, but set up on a larger geographical scale and with a wider array of native species, will be essential in developing ecological restoration methods for southern Brazilian grasslands. Keywords: Seedling emergence, degraded soil, native forage species, invasive species. Emergência e estabelecimento de espécies nativas e exóticas em solos de campos convertidos e nativos remanescentes do Planalto -Sul do BrasilResumo: Uma acelerada conversão do campo nativo em plantações de espécies florestais exóticas e lavouras tem ocorrido nos Campos de Cima da Serra, Sul do Brasil. Ainda é desconhecido o impacto que as condições edáficas, em solos alterados ou preservados, exercem no estabelecimento de espécies nativas do campo; as espécies exóticas, introduzidas deliberada ou acidentalmente, talvez sejam favorecidas. Em um common garden composto por repetições aleatórias de amostras de solo, coletadas em áreas de antigas plantações de pinus, de antigas lavouras ou em...

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Superação de dormência e metodologias para testes de germinação em sementes de Trifolium riograndense Burkart e Desmanthus depressus Humb

Cited by 21 publications

References 10 publications

Overcoming dormancy and determining optimal temperature for slender serradella seed germination

Overcoming dormancy and determining optimal temperature for slender serradella seed germination

Aspectos térmico-biológicos da germinação de sementes de cornichão anual sob diferentes temperaturas

Emergence and establishment of native and non-native species in soils of remnant and converted highland grasslands – southern Brazil

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