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| Registros recuperados: 30 | |
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| Colmenares-Trejos,Sara L.; Melgarejo,Luz Marina; Romero A.,Hernán Mauricio. |
| The physiological response of high Andean forest contrasting plants, Myrcianthes leucoxyla, a shadow-facultative heliophyte, and Abatia parviflora, a heliophyte, was studied during the transition from dry season to wet season in Bogotá. Light response curves (A-PAR), water potential (Ψw), transpiration rate (E), stomatal conductance (gs), leaf soluble protein content and peroxidase activity were measured in this study in a 48h cycle. The values for E, gs, Ψw and Ψw predawn for M. leucoxyla were 0.07 to 4.89 µg/cm s, 0.02 to 0.5 cm s-1, -0.025 to -1.05 MPa, and-0.1 MPa, respectively. For A. parviflora E, gs, Ψw and Ψw predawn were 0.47 to 12.27 µg/cm s, 0.17 to 1.42 cm s-1, -0.05 to -0.3 MPa and -0.075 MPa, respectively. A. parviflora presented a tendency... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: A-PAR curves; Gas exchange; Heliophyte; Shadow plant; Water potential. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202011000400008 |
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| Costa,Jéfferson de O.; Coelho,Rubens D.; Barros,Timóteo H. da S.; Fraga Júnior,Eusímio F.; Fernandes,André L. T.. |
| ABSTRACT The plant water potential and the leaf temperature are physiological responses of the coffee tree that can be used as indicative of the irrigation management of this crop. There is a dependence between the leaf water potential with the potential matrix of the soil solution, however, the water potential levels found for the coffee tree show divergent relationships in the literature regarding the matrix potential. The objective of this study is to verify the water potential and leaf surface temperature in the coffee tree when submitted to different irrigation levels. The study was conducted in Piracicaba, SP, Brazil, using Coffea arabica species from Red Catuaí IAC 144 variety, the drip irrigation system was adopted and the management done by... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coffea arabica; Leaf temperature; Water potential. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000500648 |
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| Escobar,Hugo; Bustos,Richard; Fernández,Felipe; Cárcamo,Henry; Silva,Herman; Frank,Nicolás; Cardemil,Liliana. |
| We analyzed the mitigating effect of NO3 - and salicylic acid (SA) on the detrimental effects of salt stress by studying the water status of plants of maize grown in Hoagland's medium with NaCl 100 mM as the saline component, to which SA and NO3 - were added in different concentrations as mitigating agents. We evaluated water potential Ψw, osmotic potential Ψs, relative water content (RWC), turgor potential (Ψp ), and the osmotic adjustment (OA) of leaves and roots. SA 0.5 mM mitigated the effects of salinity by increasing the Ψw of the leaf, the Ψsof theroot, the Ψpof the leaf, RWC and OA of the leaf; while NO3 was only effective in combination with SA, mitigating the effects of salinity by increasing... |
| Tipo: Journal article |
Palavras-chave: Nitrate; Osmotic potential; Osmotic adjustment; Salinity mitigation; Salicylic acid; Water potential; Water relative content. |
| Ano: 2010 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000300006 |
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| Favero,Ana Carolina; Amorim,Daniel Angelucci de; Mota,Renata Vieira da; Souza,Claudia Rita de; Regina,Murillo de Albuquerque. |
| Plant architecture and its interaction with agricultural practices and environmental constraints is determinant for grapevine canopy structure, which is related to carbon assimilation, bud fertility and fruit quality. In this context, this study evaluated the performance of field-grown 'Syrah' grapevines conducted by two management systems: Vertical Shoot Position (VSP) or a modified Geneva Double Curtain (GDC), in Pirapora, state of Minas Gerais, Brazil, during the winters of 2007 and 2008. The evaluations of leaf area, water relations and net CO2 assimilation were made at the end of the ripening period. Yield per vine and per hectare were estimated and mean berry weight and diameter, total soluble solids, pH and titratable acidity were evaluated during... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: CO2 assimilation; Canopy management; Water potential; Berry temperature; Fruit quality. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000300003 |
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| García Ruiz, Mayra Teresa. |
| Se evaluaron los cambios de acidez titulable a lo largo de 24 h, de las yemas vegetativas con longitud media de 0.5 cm y nopalitos de 6 y 11 cm, de Opuntia ficus-indica de los cultivares Atlixco, Copena V1, Milpa Alta, Moradaza y Solferino, con riego. También se evaluó el efecto de la disminución del potencial de agua (ΨA) del suelo, por suspensión del riego durante 60 días, en condiciones de invernadero, en el potencial osmótico (ΨS ), liberación de electrolitos (o índice de daño membranal, Id) y contenido de polisacáridos estructurales de los nopalitos de esos cinco cultivares y una recolecta silvestre de O. streptacantha. La acidez de las yemas vegetativas y los nopalitos fluctuó entre 0.2 y 0.9 % a lo largo de las 24 horas del día, con las... |
| Tipo: Tesis |
Palavras-chave: Acidez titulable; Potencial hídrico; Potencial osmótico; Polisacáridos; Maestría; Fisiología Vegetal; Tritable acidity; Water potential; Osmotic potential; Polysaccharides. |
| Ano: 2007 |
URL: http://hdl.handle.net/10521/1654 |
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| Méndez,Yurany Dayanna Rivera; Chacón,Leonardo Moreno; Bayona,Cristihian Jarry; Romero,Hernán Mauricio. |
| Water supply is the main yield-limiting abiotic factor of oil palm in Colombia. To determine the effect of water deficit on the physiology of oil palm and to assess the tolerance degree to this condition, interspecific Elaeis oleifera versus Elaeis guineensis 'U1273', 'U1859', 'U1914', and 'U1937' hybrids were planted for 60 days in soil with different water potentials (-0.042, -0.5, -1.0, and -2.0 MPa) in a complete randomized factorial design with three replications. The water potential, osmotic adjustment molecules (total and reducing sugar content), gas exchange (photosynthesis rate, stomatal conductance, water use efficiency, and leaf respiration), and vegetative growth (height, bulb diameter, leaf area, number of leaves, total dry matter, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ecophysiology; Growth; Stress; Tolerance; Water potential. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202012000400006 |
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| Meneses,Carlos Henrique Salvino Gadelha; Bruno,Riselane de Lucena Alcântara; Fernandes,Pedro Dantas; Pereira,Walter Esfrain; Lima,Leonardo Henrique Guedes de Morais; Lima,Marleide Magalhães de Andrade; Vidal,Márcia Soares. |
| The physiological quality of cotton cultivar seeds (Gossypium hirsutum var. latifolium L.) was evaluated in laboratory by the simulation of water potentials with polyethyleneglycol-6000 (0.0; -0.2; -0.4; -0.6; -0.8 and -1.0 MPa), at 25ºC using germitest paper as substrate. A completely randomized design in a 4 × 6 factorial scheme with four replications of 50 seeds each was used. The studied variables were: germination percentage, first count of germination, germination velocity index, accelerated aging in water, electrical conductivity, humidity, vigor classification, radicle length and radicle/shoot length ratio. The effect of water stress on seed viability and on plantlet vigor was severe at potentials below -0.4 MPa. The 'CNPA 187 8H' cultivar was the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gossypium hirsutum var. latifolium L.; PEG-6000; Vigor; Water potential. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162011000200001 |
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| Oliveira,Wanderson J. de; Souza,Edivan R. de; Almeida,Brivaldo G. de; Silva,Ênio F. de F. e; Melo,Hidelblandi F. de; Leal,Lucas Y. C.. |
| ABSTRACT The study of the water energetic status under saline condition and its impact on the development of cowpea is of extreme importance, since this crop is the food base in many parts of the world. An experiment was carried out in a greenhouse from March to May 2014 using the cultivar IPA 206 in Fluvisol collected in the municipality of Pesqueira, PE, Brazil. Waters with six levels of electrical conductivity (0; 2.5; 5; 7.5; 10; 12.5 dS m-1) formulated with NaCl and a salt mixture were used. The experiment was conducted in randomized blocks in a 6 x 2 factorial arrangement with four replicates, forming 48 experimental plots. The matric, osmotic and total potential of water in the soil, the osmotic, and water potential in the plant and atmospheric... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water potential; Osmotic potential; Vigna unguiculata. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000800685 |
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| Registros recuperados: 30 | |
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