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| Registros recuperados: 92 | |
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| Maia,Fernanda Costa; Maia,Manoel De Souza; Bekker,Renée M.; Berton,Rogério Previatti; Caetano,Leandro Sebastião. |
| The interest was the seed longevity dynamics of annual ryegrass in natural conditions as an important tool to explain its dynamics in no tillage systems used in the South of Brazil. The species is commonly managed for natural re-sowing and, in this way, allows cattle grazing with reduced costs during the winter time. In February of 2003, twenty bags of nylon screen containing sterilised soil with 100 seeds in each were randomly buried in the field, 5 cm deep. Around every three or four months, four sacks were exhumed. Seeds were counted and tested using germination and tetrazolium tests.The seeds showed high primary dormancy, which was overcome very fast. After 108, 226, 326, 565 and 732 days of burial there were no significant differences as the secondary... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Annual ryegrass; Persistence; Viability; Dormancy; Buried seeds. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-31222009000200014 |
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| Vieira,Antônio Rodrigues; Vieira,Maria das Graças Guimarães Carvalho; Fraga,Antônio C.; Oliveira,João Almir; Santos,Custódio D. dos. |
| To evaluate the effectiveness of gibberellic acid (GA3) in breaking rice seed dormancy and the use of alpha-amylase enzyme activity as an indicator of the dormancy level, seed from the intensively dormant irrigated cultivar Urucuia were used. The seeds were submitted to a pre-drying process in a forced air circulation chamber under 40ºC during 7 days and submersed in 30 mL of GA3 solution under 0, 10, 30 and 60 mg/L H2O concentrations, during 2, 24 and 36 hours. After the treatments, the alpha-amylase activity was determined by using the polyacrilamide electrophoresis and spectrophotometry. At the same time, the germination test was made. The results indicated a gain in germination and in alpha-amylase activity in higher concentrations and soaking time of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rice seeds; Dormancy; Germination; Gibberellic acid (GA3); Alpha-amylase. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-31222002000200008 |
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| Brasileiro,Beatriz Gonçalves; Dias,Denise Cunha F. S.; Casali,Vicente Wagner Dias; Bhering,Maria Carmen; Cecon,Paulo Roberto. |
| The objective of this study was to evaluate the effects of temperature, substrate and pre-germinative treatments on T. triangulare seeds. Four temperatures (constant 20, 25, 30 °C and alternate 20-30 °C) and two types of seeding (on paper and between paper), with light, were evaluated. The pre-germinative treatments evaluated included: immersion in water (24 hours), immersion in 6% hypochlorite solution (1 hour), immersion in 0.2% potassium nitrate solution (24 hours), immersion in 0.05% gibberellin solution (24 hours) and the control (untreated seeds). The highest germination percentage was observed at the alternate temperatures of 20-30 ºC, but with no significant difference between the substrates at this temperature. Soaking seeds in KNO3 gave the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Substrate; Germination; Dormancy; Medicinal plant. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-31222010000400017 |
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| Miranda,Marcel S.; Fontenelle,José H.. |
| ABSTRACT. The population dynamics of Megalobulimus paranaguensis (Pilsbry & Ihering, 1900), a large and long-lived land gastropod from Brazil's Southeast (Atlantic Forest) was studied between 2006 and 2009, at an urban park in the city of Santos, state of São Paulo. The study included biometry, weighing, and marking and recapture of adult individuals. The variables obtained from specimens were correlated with the environmental variables of the study period. The survival rate of the adult snail population was 96.7%. Recruitment showed several peaks during the year, and was concentrated between April and August, except in 2009, when there was only one peak in August. Specimen abundance progressively increased from 2006 on, with a trend towards relative... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Activity; Abundance; Dormancy; Land snail. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702015000600463 |
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| Araújo,Alisson Vinicius de; Araújo,Eduardo Fontes; Amaro,Hugo Tiago Ribeiro; Santos,Ricardo Henrique Silva; Cecon,Paulo Roberto. |
| ABSTRACT Although used as green manure, one of the challenges the cultivation of Crotalaria juncea is the low availability of quality seeds in the market. The harvest at the right time contributes to the achievement of better quality seeds. The objectives of this study were to evaluate the storability and characterize the physical and physiological changes of the seeds harvested at different times. The statistical design was completely randomized with three replications. Treatments consisted of four harvest seasons and two storage periods (0 to 8 months). The samples were collected when the plants reached 40, 60, 80 and 100% of dried pods. The following characteristics were evaluated: time for drying, moisture content, dry matter accumulation, physical... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Green manure; Storage; Dormancy; Physiological maturity. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902018000100103 |
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| Gallon,Mateus; Trezzi,Michelangelo Muzell; Diesel,Francielli; Possenti,Jean Carlo; Batistel,Sorhaila Camila. |
| ABSTRACT Specific knowledge on dormancy and germination patterns of weed species aids the development of integrated management strategies. This study aimed to evaluate and select effective methods for overcoming dormancy in B. latifolia seeds, as well as determining their influence on the germination process. A completely randomized experimental design was used, with four replications and 20 seeds per repetition. Seven tests were conducted, with the corresponding B. latifolia seed treatments: Test 1 - mechanical scarification, sulfuric acid, hot water and running water; Test 2 - pre-cooling at 4 °C and dry heat at 60 °C. Test 3 - gibberellic acid at concentrations of 0, 50, 100, 200 and 400 ppm; Test 4 - acetic acid and potassium nitrate 2%; Test 5 - dual... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Broadleaf buttonweed; Overcoming; Dormancy; Soaking; Rubiaceae. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902018000300475 |
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| Campos,Raúl E; Sy,Victoria E.; Castro,Luis. |
| The role of environmental factors on the hatching response of O. albifasciatus (Macquart) eggs is studied by simulating winter conditions in the laboratory. The hypothesis tested was that hatching response is affected by: (1) time that eggs remain at low temperature, (2) storage conditions, and (3) acclimatization time. Eggs were stored at 5ºC in drought and immersion conditions during 7, 21, 35, 90 and 146 days, immediately after, they were acclimatized at 22ºC during 24, 72, and 168 hours, and then eggs were flooded to induce hatching. Percent of hatched eggs was analyzed with a Generalized Lineal Model with a binomial distribution. Results show that: (1) a long storage period at cold temperature and long acclimatization periods improve the hatching... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Floodwater mosquito; Diapause; Dormancy; Egg; Hatching factors. |
| Ano: 2007 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0373-56802007000100006 |
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| Nascimento,Warley Marcos. |
| Lettuce (Lactuca sativa L.) seed germination is strongly temperature dependent and under high temperatures, germination of most of genotypes can be erratic or completely inhibited. Lettuce seeds of 'Dark Green Boston' (DGB) were incubated at temperatures ranging from 15° to 35°C at light and dark conditions. Other seeds were imbibed in dark at 20°; 25°; 30°; and 35°C for 8 and 16 hours and then transferred to 20 or 35°C, in dark. Seeds were also incubated at constant temperature of 20° and 35 °C, in the dark, as control. In another treatment, seeds were primed for 3 days at 15°C with constant light. DGB lettuce seeds required light to germinate adequately at temperatures above 25°C. Seeds incubated at 20°C had 97% germination, whereas seeds incubated at... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Germination; Dormancy; Seed priming; Stand establishment. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300010 |
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| Nascimento,Warley Marcos. |
| Ethylene can stimulate seed germination and overcome dormancy in many species. For instance, the inhibitory effect of high temperature on lettuce seed germination can be overcome by exogenous ethylene. Involvement of ethylene in seed germination is a widely accepted fact, but the mechanistic details are poorly understood. A critical factor in ethylene studies is the response of seed germination properties to various ethylene inhibitors. Lettuce seed has been used as a model to study the role of ethylene in seed germination at high temperature. The role of ethylene in germination is not known but either ethylene evolution or addition of 1-aminocyclopropane-1-carboxilic acid (ACC) have been associated with increased activity of endo-beta-mannanase, a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lactuca sativa; Thermoinhibition; Dormancy; Enzyme activity. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000300029 |
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| Brito,Leomara Pessoa; Araújo Lacerda,José Dantas; Araújo Soares,Cintia; Monteiro Júnior,Franklin Luís Carlos; Souza,Magno Chagas; Aguiar Fonseca e Souza,Áurea Izabel; Lima,Clenes Cunha; Rodrigues,Marcos. |
| Abstract This study aimed to verify the impact of different methods of overcoming dormancy in the germination of Ipomoea cavalcantei seeds, in addition to surveying the biometric data of its seeds and fruits. Ripe fruits were randomly collected from the species' habitat, which is a unique ecosystem characterized by small vegetation and iron outcrops. For the biometric analyses, the weight, moisture content, length, width, and thickness of 100 fruits and 100 seeds were determined. To analyse the efficiency of overcoming seed dormancy, six different treatments were tested, including mechanical, physical, and chemical methods, and the resultant germinability, average germination time, and germination speed index were evaluated. Further, in order to estimate... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Conservation unit; Dormancy; Ipomoea cavalcantei; Mining; Scarification. |
| Ano: 2022 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122022000100081 |
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| Martins,Alexandre Cristante; Marchioretto,Rafaella Migliavacca; Vieira,Ariane Tonetto; Stiehl-Alves,Eudes Maria; Santos,Eliane Kaltchuk dos; Souza-Chies,Tatiana Teixeira de. |
| ABSTRACT South Brazilian grasslands are among the most species-rich grasslands worldwide yet they have been suffering ongoing degradation due to land-use. Little is known about the reproductive ecology of the native species of these grasslands. Thus, our goal was to characterize seed traits and germination requirements of three native species of the tribe Tigridieae (Iridaceae, Iridoideae) due to its richness in the Pampa biome and the contrasting morphology, cytogenetics, and geographic distributions of its representatives. We tested if closely related species possess similar seed traits and whether species with wider distributions have broader germination requirements. Seed production and mass were estimated, and morphological analyses, germination... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dormancy; Functional traits; Germination; Grasslands; Iridaceae; Photoinhibition; Regeneration niche; Reproductive ecology; Seed morphology; Time-to-event analysis. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062020000400730 |
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| Castro, Damián César; Alvarez, Norma; Gabriel, Paola; Buyatti, Marcela; Favaro, Juan Carlos; Gariglio, Norberto. |
| The purpose of this work was to study the response of two apple cultivars bred for low chilling environments to artificial chilling accumulation. Two trials were carried out; in experiment one, excised shoots were randomly taken from “Caricia” and “Princesa”, and in experiment two, intact and excised shoots of “Caricia”, “Princesa” and “Gala” (control) were collected. After collection, both shoot types were exposed to artificial chilling accumulation (4.0 ± 0.5°C) from 0 to 1200 chill units (CU). Bud break of mixed buds of “Caricia” and “Princesa” was higher than 50% between 0 CU to 1200 CU, irrespective of shoot type. Bud break of “Gala” mixed buds exceeded 50% only in intact shoots after accumulating 900 CU. The mean time to bud break of “Caricia” and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Malus domestica Borkh; Dormancy; Bud break; Lack of chilling; Heat requirements. |
| Ano: 2017 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/30996 |
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| Urtasun, María Manuela; Giamminola, Eugenia Mabel; Viana, Marta Leonor de. |
| In this work, we report the effects of the harvesting time, the stages in fruit ripening and the influence of potassium nitrate in V. quercifolia seed germination. In addition, information about the storage period and light requirements is provided. Fruits were harvested at the beginning and at the end of the fruiting season, and they were classified into five ripening categories. Seed germination was evaluated with two factorial experiments: 1) harvesting time, fruit ripening, and pre-germination treatment; 2) storage and light requirements. The response variables were germination percentage, mean germination time, and seedling vigor. Seeds harvested at the beginning of the season appeared to be less dormant and they were not influenced by fruit ripening... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Caricaceae; Dormancy; Photoblastism; Potassium nitrate.. |
| Ano: 2019 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42825 |
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| Rodrigues, Adriana Paula D'Agostini Contreiras; Universidade para o Desenvolvimento do Estado e da Região do Pantanal; Kohi, Marilda Cervi; Universidade para o Desenvolvimento do Estado e da Região do Pantanal; Pedrinho, Denise Renata; Universidade para o Desenvolvimento do Estado e da Região do Pantanal; Arias, Edilson Rubens Arrabal; Universidade para o Desenvolvimento do Estado e da Região do Pantanal; Favero, Silvio; Universidade para o Desenvolvimento do Estado e da Região do Pantanal. |
| Objetivou-se o estudo de diferentes tratamentos para superar a dormência de sementes da espécie arbórea Acacia mangium Willd. Os tratamentos avaliados foram: imersão das sementes em ácido sulfúrico (96% PA) por 15, 30, 60 e 90 minutos; imersão das sementes em água fervente (100°C) por 15, 30 e 60 segundos e testemunha sem tratamento prévio das sementes. Foram utilizadas quatro repetições de 100 sementes por tratamento. Após tratadas, colocaram-se as sementes para germinar em caixas gerbox, com papel filtro umedecido, na temperatura média de 27,5ºC. As avaliações foram diárias, por 21 dias. Foram avaliadas as seguintes variáveis: porcentagem de germinação, primeira contagem do teste de germinação, velocidade de germinação e o índice de velocidade de... |
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Palavras-chave: 5.01.03.05-9 Melhoramento Vegetal Acacia mangium; Sementes; Dormência; Escarificação 5.01.03.05-9 Melhoramento Vegetal Acacia mangium; Seeds; Dormancy; Scarification. |
| Ano: 2008 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/1786 |
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| Drumond, Anailda Angélica Lana; Sales, Juliana de Fatima; Zuchi, Jacson; Camelo, Gessimar Nunes; Souza, Moara Mariely Vinhais. |
| Environment and storage time influence stored seed quality, especially for oilseeds such as castor beans because they have a high lipid content and are more prone to deterioration. This study evaluated the physiological quality of seeds from three castor bean genotypes stored at 10 and 20°C for 300 days. The experimental design was completely randomized, with 4 replications, in a 2 x 6 (2 temperatures x 6 storage periods) split-plot design. The seeds were placed in low-density polypropylene bags and stored in climatic chambers at 10 and 20°C, in which the temperature and relative humidity were registered. Physiological quality (germination, germination rate index, emergence, rate of emergence, electrical conductivity and accelerated aging) were evaluated... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ricinus communis L.; Seed conservation; Dormancy; Temperature. Produção e Beneficiamento de Sementes. |
| Ano: 2019 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/43583 |
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| Registros recuperados: 92 | |
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