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Accelerated ageing test to evaluate vigour in Jatropha curcas L. seeds Rev. Ciênc. Agron.
Oliveira,Glauter Lima; Dias,Luiz Antônio dos Santos; Dias,Denise Cunha Fernandes dos Santos; Soares,Marcos Morais; Silva,Laércio Junio da.
There is currently great interest in the cultivation of the Jatropha curcas L., known locally as physic nut, for the production of biodiesel, leading to an increase in the demand for seeds and precise information as to their physiological quality, especially vigour. The objective was to evaluate the efficiency of the accelerated ageing test, with variations, in verifying the vigour of Jatropha seeds. Four seed lots were initially characterized as to their physiological quality by germination and vigour tests. For accelerated ageing test, temperatures of 42 and 45 ºC were tested during 48, 72 and 96 hours. The experiment was carried out in a completely randomized design and the averages of the treatments compared by Tukey test (p<0,05). The Pearson...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Physiological quality; Germination; Physic nut.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902014000100015
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Parameters based on X-ray images to assess the physical and physiological quality of Leucaena leucocephala seeds Ciência e Agrotecnologia
Medeiros,André Dantas de; Araújo,Joyce de Oliveira; León,Manuel Jesús Zavala; Silva,Laércio Junio da; Dias,Denise Cunha Fernandes dos Santos.
ABSTRACT Non-destructive and high performance analyses are highly desirable and important for assessing the quality of forest seeds. The aim of this study was to relate parameters obtained from semi-automated analysis of radiographs of Leucaena leucocephala seeds to their physiological potential by means of multivariate analysis. To do so, seeds from five lots collected from parent trees from the region of Viçosa, MG, Brazil, were used. The study was carried out through analysis of radiographic images of seeds, from which the percentage of damaged seeds (predation and fungi), and measurements of area, perimeter, circularity, relative density, and integrated density of the seeds were obtained. After the X-ray test, the seeds were tested for germination in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Forest species; Image analysis; Multivariate analysis; Relative density; Seed radiography.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542018000600643
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Relationship between fruit maturation stage and physiological quality of physic nut (Jatropha curcas L.) seeds Ciência e Agrotecnologia
Silva,Laércio Junio da; Dias,Denise Cunha Fernandes dos Santos; Milagres,Carla do Carmo; Dias,Luiz Antônio dos Santos.
The physic nut (Jatropha curcas L.) has great potential for use in biodiesel production due to the high oil content of its seeds. Production of high quality seeds depends upon the appropriate time of harvest. A field experiment was carried out to monitor the maturation process of physic nut seeds and to establish the ideal harvest time of the seeds based on external fruit color. Fruits were collected at different maturation stages based on the external color: green, yellow-green, yellow, yellow-brown and brown. Seeds were extracted manually and, after natural drying, were submitted to the following tests and determinations: moisture content and dry matter, germination, first count seedling emergence, seedling growth, accelerated aging, electrical...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Germination; Vigor; Harvest; Maturity.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000100005
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The effect of fruit maturity on the physiological quality and conservation of Jatropha curcas seeds Rev. Ciênc. Agron.
Silva,Laércio Junio da; Dias,Denise Cunha Fernandes dos Santos; Oliveira,Glauter Lima; Silva Júnior,Rubens Alves da.
ABSTRACT The aim of this study was to evaluate the effect of fruit maturation stage on the physiological quality of J. curcas seeds during storage. Thus, seeds were extracted from fruits harvested at different maturity stages based on external color, i.e., yellow, yellow-brown and brown (dry fruits). After natural drying, the seeds were packed in Kraft paper bag and stored for 18 months at laboratory environment. Initially and every three months, the seeds were evaluated for moisture content, germination, first count of germination, accelerated aging, cold test, electrical conductivity and emergence. There was reduction in seed physiological quality, with decrease in germination and vigor, especially after nine months of storage. The seeds extracted from...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Germination; Vigor; Storage; Seed deterioration.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000300487
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Tolerance of crambe (Crambe abyssinica Hochst) to salinity and water stress during seed germination and initial seedling growth Ciência e Agrotecnologia
Silva,Martha Freire da; Araújo,Eduardo Fontes; Silva,Laércio Junio da; Amaro,Hugo Tiago Ribeiro; Dias,Luiz Antônio dos Santos; Dias,Denise Cunha Fernandes dos Santos.
ABSTRACT Crambe is an oilseed plant whose oil is suitable for various industrial purposes, such as production of biodiesel, plastics, rubbers, and cosmetics. There are reports of the rusticity of this species and its potential for growth in arid and semi-arid environments, where water scarcity and soil salinity are common. However, studies regarding the tolerance of its seeds to these stresses and the physiological responses triggered during germination and seedling establishment under these conditions are incipient. The objective of this study was to evaluate the tolerance of crambe seeds to water deficit and salt stress during germination and early seedling development, as well as to investigate the role of antioxidant enzymes on tolerance to these...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Abiotic stresses; Antioxidant enzymes; Polyethylene glycol; Potassium chloride; Oilseed plant..
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542019000100201
Registros recuperados: 5
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