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Registros recuperados: 6
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Avaliacao da qualidade fisiologica de sementes de soja, apos o processo de hidratacao-desidratacao e envelhecimento acelerado. Repositório Alice
BRACCINI, A. de L. E; REIS, M. S.; SEDIYAMA, C. S.; SCAPIM, C. A.; BRACCINI, M. do C. L..
Foi conduzido um experimento com o objetivo de avaliar a qualidade fisiologica de sementes de soja (Glycine max (L.) Merrill), envolvendo as variedades UFV-10, IAC-8 e Doko RC, submetidas ao processo de hidratacao-desidratacao, seguido por uma condicao de estresse induzida pelo teste de envelhecimento acelerado. As sementes foram pre-condicionadas em PEG 6000, com potencial osmotico de -0,8 MPa, a uma temperatura de 20 Graus C., por quatro dias. Em seguida, as sementes foram novamente desidratadas, ate atingir o conteudo de umidade inicial, sendo entao submetidas ao teste de envelhecimento acelerado pelos seguintes periodos: 0, 24, 48 e 72 horas. As sementes pre-condicionadas foram comparadas com duas testemunhas: sementes nao-tratadas e sementes embebidas...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Glycine max; Germinacao; Vigor; Estresse hidrico; Condicionamento osmotico; Germination; Water stress; Osmoconditioning.
Ano: 1999 URL: http://www.alice.cnptia.embrapa.br/handle/doc/86411
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Carrot seed germination and ethylene production at high temperature in response to seed osmopriming Horticultura Brasileira
Nascimento,Warley M; Huber,Donald J; Cantliffe,Daniel J.
Carrot (Daucus carota) seed germination can be erratic or reduced under temperatures above 35ºC. Priming circumvents seed thermoinhibition in several crops, including carrot. The involvement of ethylene in germination at supra-optimal temperatures has been reported in other species, but its role in carrot seed germination has not been examined. The objective of this study was to determine whether priming-mediated improvement in carrot seed germination at high temperature was associated with increased ethylene production. Seeds of two tropical carrot genotypes (Alvorada and Brasília) were incubated over a range of temperatures. 'Brasilia' seeds were primed for 72 hours in aerated PEG solution at 15ºC under light conditions and germination tested at 20 and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Daucus carota; Thermotolerance; Stand establishment; Osmoconditioning; Cultivars.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362013000400008
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Endogenous growth regulator detection in Guinea grass seeds. Repositório Alice
USBERTI, R.; VALIO, I.F.M..
Foi detectada a atividade/nivel endogeno de reguladores de crescimento em sementes de capim-coliniao (Panicum maximum Jacq.), especie muito usada para formacao de pastagens nos tropicos, visando explicar o seu alto nivel de dormencia. As sementes foram previamente escarificadas, ou nao, com acido sulfurico, e osmocondicionadas em PEG-6000. Os reguladores de crescimento foram detectados como segue: atividade giberelinica (bioteste do hipocotilo de alface), citocininas (bioteste do aumento do peso fresco de cotiledones de rabanete), e ABA (espectrofotometria a 230 nm). A aplicacao exogena de GA, aumentou a germinacao, enquanto ABA inibiu-se completamente. Amostras com alta dormencia apresentaram maior atividade giberelinica que as de baixa dormencia, bem...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Germinacao; Dormencia; Osmocondicionamento; Panicum maximum; Germination; Dormancy; Osmoconditioning.
Ano: 1997 URL: http://www.alice.cnptia.embrapa.br/handle/doc/89888
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Muskmelon seed germination and seedling development in response to seed priming Scientia Agricola
Nascimento,Warley Marcos.
Important factors affecting seed priming have not been extensively reported in muskmelon (Cucumis melo L.) studies. The optimization of the seed priming technique becomes very important at the commercial scale. Little information has been reported on seedling development of muskmelon subsequent to seed priming. Seeds of muskmelon were primed in darkness at 25°C in different solutions and three osmotic potentials. Seeds were also primed with and without aeration during different periods. In relation to osmotic solutions, an osmotic potential around -1.30 MPa is most adequate for muskmelon priming. Salt solutions gave better germination rate but were deleterious for seed germination, especially at higher osmotic potentials. Aeration of the soaking salt...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cucumis melo; Osmoconditioning; Stand establishment.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100011
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Muskmelon seed priming in relation to seed vigor Scientia Agricola
Nascimento,Warley Marcos; Aragão,Fernando Antônio Souza de.
A number of important factors may affect seed priming response, including seed quality. Effects of seed vigor on seed priming response were investigated using seed lots of two muskmelon (Cucumis melo L.) cultivars. Seeds of muskmelon, cvs. Mission and Top Net SR were artificially aged at 43°C for 0, 20 and 40 hours. Seeds were primed for six days in darkness at 25°C in KNO3 (0.35 mol L-1) aerated solution. Aged seeds germinated poorly at 17°C. Priming increased germination rate at 17 and 25°C and germination percentage at 17°C. An interaction effect on germination performance between vigor and priming was observed, especially at low temperature. Priming increased germination performance in seeds of low vigor, and the response was cultivar dependent.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Germination; Osmoconditioning; Cultivars; Stand establishment.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100019
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Osmotic priming methodologies in relation to the physiological performance of rangpur lime seeds (Citrus limonia Osbeck) Rev. bras. sementes
Dantas,Ísis Barreto; Guimarães,Renato Mendes; Pinho,Édila Vilela de Rezende Von; Carvalho,Maria Laene Moreira de.
Several mechanisms have been used to promote rapid germination of citrus seeds and uniform seedling emergence. We evaluated the effects of osmotic priming on the physiological performance of Rangpur lime seeds (Citrus limonia Osbeck). Seeds were treated with 30 g of Captan and 10 g of Tecto 600 in 20-litre batches and stored, without drying, at 10 ºC and 50% relative humidity for periods of 3, 6 and 9 months. After each period, seeds were primed at 25 ºC, in the light, by immersion in Poliethylenoglicol (PEG 6000), potassium nitrate (KNO3) and 70% PEG 6000 plus 30% KNO3, all at an osmotic potential of -1.1MPa, for priming periods of 3, 6, 9 and 12 days. Percentage germination, tray emergence and the emergence rate index (ERI) were evaluated. Priming in PEG...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Citrus; Osmoconditioning; Priming; Storage.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-31222010000300016
Registros recuperados: 6
Primeira ... 1 ... Última
 

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