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| Registros recuperados: 12 | |
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| Lira,Jean Marcel Sousa; Lara,Túlio Silva; Rodrigues,Amanda Cristiane; Dousseau,Sara; Magalhães,Marcelo Murad; Alvarenga,Amauri Alves de. |
| The loss of benefits after re-drying is one of the drawbacks of the seed priming technique. Different types of stresses have been used before re-drying to preserve the priming benefits. This process may be seen as promoting cross tolerance to increase the defense mechanisms that prevent loss of viability in seeds primed after drying. We tested the effect of some stresses to induce cross-tolerance and different drying conditions with the aim of maintaining priming benefits in melon seeds. The seeds were primed in an aerated KNO3 solution (0.35M), -1.7MPa, 25 °C, in the dark for six days. The primed seeds were then submitted to slow drying, fast drying, cold shock + slow drying, cold shock + fast drying, heat shock + slow drying, heat shock + fast drying,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: PEG; Priming; Dry seeds; Antioxidant system. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542015000200131 |
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| Almeida,Julieta Andrea Silva de; Pereira,Maria de Fátima Domingos Aleixo. |
| Kohleria eriantha (Benth.) Hanst. pertence à família Gesneriaceae e possui órgão subterrâneo, que está associado à reprodução vegetativa. Este órgão apresenta gemas envoltas por folhas modificadas, as quais armazenam amido. Em seções do rizoma (1,5 a 2,0cm compr.) contendo seis gemas, só uma gema geralmente brota. Esta pode diferenciar-se em dois padrões morfológicos: parte aérea ou rizoma. Em seções mantidas em substrato com baixo teor de umidade (1mL de água) ou em sua ausência, houve brotação do padrão rizoma, em seções em substrato com elevado teor de umidade (12mL de água), brotação do padrão parte aérea. A temperatura de 20ºC também favoreceu a brotação do padrão rizoma, independente do volume de água do substrato. Seções também desenvolveram o... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brotação; Concentração osmótica; Padrão morfológico; PEG; Teor de umidade. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062004000400017 |
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| Castañeda-Castro,Odón; Gómez-Merino,Fernando C.; Trejo-Téllez,Libia I.; Pastelín-Solano,Miriam C.. |
| The potential capacity of plant roots to absorb water and nutrients generally declines in osmotic-stressed plants, presumably because of a reduction in the nutrient element demand, and such decrease varies among plant genotypes. In order to investigate the effect of the osmotic stress caused by polyethylene-glycol 6000 (PEG) on the macronutrient concentration in sugarcane (Saccharum spp.) in vitro, we established a factorial experiment with a completely randomized distribution. Study factors were variety (Mex 69-290 and CP 72-2086) and PEG in the nutrient medium (0, 3, 6 and 9 %, to generate osmotic potential corresponding to -0.18, -0.45, -0.65 and -0.80 MPa, respectively), which resulted in eight treatments, with five replicates each. The experimental... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Plant nutrition; Poaceae; PEG; Nitrogen; Phosphorus; Potassium. |
| Ano: 2015 |
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952015000800004 |
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| Sousa,Eduardo C.; Silva,Daniel V.; Sousa,Danielle M. M.; Torres,Salvador B.; Oliveira,Renata R. T.. |
| ABSTRACT Seed germination of species that develop in arid and semi-arid soils can be altered by water deficit and abundance of salts in the soil. Knowledge on tolerance limits is fundamental to understand the adaptive capacity of species under such conditions. The objective of this study was to evaluate the physiological changes (germination and vigor) of Mimosa caesalpiniifolia seeds from different regions and submitted to water and saline stresses. To simulate water stress, the osmotic agent polyethylene glycol (PEG 6000) was adjusted to the potentials of 0, -0.2, -0.4, -0.6 and -0.8 MPa, whereas for the saline stress, NaCl solutions were adjusted to the potentials of 0, -0.1, -0.3, -0.5, -0.7; -0.9 and -1.1 MPa. The experimental design was completely... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fabaceae; ‘Sabiá’; PEG; NaCl; Abiotic stress. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000600383 |
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| Castro Montes, Ivonné. |
| Se estudió la respuesta morfo-fisiológica al estrés osmótico de brotes obtenidos vía organogénica de líneas de maíz LE-13, LE-14, LE-16 y LE- 46, durante tres ciclos de selección in vitro. El estrés osmótico fue inducido con polietilenglicol (PEG-8000) adicionado al medio básico MS (1962). A partir de plántulas in vitro se disecaron secciones de coleóptilo (explante) y se sembraron en medio sólido. Se encontraron diferencias significativas entre las líneas con respecto a: longitud de coleóptilo, altura de plántula y número de hojas. Durante la inducción de organogénesis, se encontró un efecto significativo del genotipo x pH, posición del explante, consistencia del medio y del genotipo x período de subcultivo. En la etapa de multiplicación y... |
| Tipo: Tesis |
Palavras-chave: Estrés osmótico; Multiplicación de brotes; PEG; Selección in vitro; Zea mays L. Osmotic stress; Shoots multiplication; PEG; In vitro selection; Zea mays L.. |
| Ano: 2012 |
URL: http://hdl.handle.net/10521/1080 |
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| Mantovani,André; Iglesias,Ricardo R.. |
| Bromeliad seedlings are rarely found on sandy coastal plains (restinga), limited, probably, by stressful conditions and/or specific abiotic requirements for germination. The effect of water stress on rate, time, synchronicity and spreading of germination was evaluated here for three terrestrial bromeliads from the restinga of Maricá using osmotic solutions of polyethyleneglicol 6000 (PEG 6000), from 0.0 to -0.26 MPa for 30 days. Water stress induced by PEG lowered rate and increased time and synchronicity values, besides the number of daily events of bromeliad seed germination, under water potentials between 0.00 to -0.14 MPa. No seeds germinated under water potentials lower than -0.14 MPa. These results reinforce a constant and/or high moisture... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bromeliaceae; PEG; Sandy plains; Seed. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042010000100017 |
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| Registros recuperados: 12 | |
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