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Registros recuperados: 4
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Crescimento e capacidade fotossintética da cultivar de amendoim BR 1 sob condições de salinidade AGRIAMBI
Graciano,Erika S. A.; Nogueira,Rejane J. M. C.; Lima,Danúbia R. M.; Pacheco,Cinthya M.; Santos,Roseane C..
Objetivou-se com este trabalho avaliar o crescimento e a capacidade fotossintética da cultivar de amendoim BR 1, submetida a salinidade. O experimento foi conduzido em casa de vegetação, em delineamento inteiramente casualizado com quatro níveis de salinidade da solução, expressos em condutividade elétrica (1,0; 3,5; 6,0 e 8,5 dS m-1) e seis repetições. A cultivar BR 1 apresentou, quando cultivada sob estresse salino, mecanismos fisiológicos capazes de assegurar seu crescimento. O crescimento do sistema radicular e a estabilidade dos pigmentos fotossintéticos foram as variáveis maìs relacionadas com a tolerância à salinidade. Contudo, a cultivar BR 1 é sensível à salinidade quando a condutividade elétrica é de 8,5 dS m-1, afetando a condutância estomática...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Arachis hypogaea; Estresse salino; Crescimento; Fotossíntese.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662011000800005
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Growth evaluation and water relations of Erythrina velutina seedlings in response to drought stress Braz. J. Plant Physiol.
Silva,Elizamar Ciríaco da; Silva,Marcos F. A.; Nogueira,Rejane J. M. C.; Albuquerque,Manoel B..
Erythrina velutina Willd. (common name: mulungu) is a deciduous, heliophyte found in the semi-arid region of northeastern Brazil. To evaluate the growth and water relations of mulungu seedlings in soils with different degrees of moisture content, an experiment was carried out under greenhouse conditions using four water treatments (100%, 75%, 50% and 25% of the field capacity- FC). Predawn (Ψpdw) and midday leaf water potential (Ψmdw), relative water content (RWC), plant height, number of leaves, stem diameter, leaf area (LA), specific leaf area (SLA), leaf area ratio (LAR), dry matter in different organs, biomass partitioning and root:shoot ratio were evaluated. No differences were detected between treatments for Ψpdw after 30 days; however, at midday,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biomass allocation; Dry matter; Leaf area; Root to shoot ratio; Relative water content; Water potential.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202010000400002
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Stomatal changes induced by intermittent drought in four umbu tree genotypes Braz. J. Plant Physiol.
Silva,Elizamar C.; Nogueira,Rejane J. M. C.; Vale,Fernando H. A.; Araújo,Francisco P. de; Pimenta,Mariana A..
Transpiration (E), diffusive resistance (r s) and anatomical parameters were measured in plants of four grafted umbu tree genotypes (GBUs 44, 48, 50 and 68) in order to evaluate alterations induced by intermittent drought and possible genotypic variations. Transpiration measurements were taken daily until stomatal closure by withholding water. Measurements were also taken, when the plants were re-watered and the watering was interrupted again. This cycle was repeated for a period of 31 days (stress period). The control plants were also irrigated daily. A regular pattern in the stomatal opening/closing mechanism was observed throughout the watering period, exhibiting intra-specific differences. Stomatal behavior of GBU 44 and GBU 68 were influenced by air...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Diffusive resistance; Spondias tuberosa; Stomatal density; Transpiration; Water deficit.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000100005
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Water relations and organic solutes production in four umbu tree (Spondias tuberosa) genotypes under intermittent drought Braz. J. Plant Physiol.
Silva,Elizamar C.; Nogueira,Rejane J. M. C.; Vale,Fernando H. A.; Melo,Natoniel F. de; Araújo,Francisco P. de.
In order to evaluate changes in leaf water potential (ψw) and solute accumulation induced by intermittent drought, an research was performed under greenhouse conditions using four umbu tree genotypes (GBU 44, GBU 48, GBU 50 and GBU 68) and two water treatments (control and stressed by withholding water), with four replicates. The ψw was measured in four-hour intervals during a 24-hour period at the first stomatal closure and at the end of the experimental period. Carbohydrates, amino acids, protein and proline contents were also evaluated in leaves and roots. Significant differences were found in most of the studied parameters. The lower ψw hour was between 800 h and 1200 h. GBU 50 reduced significantly ψw in stressed plants at 800 h, while control plants...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Carbohydrates; Proline; Spondias tuberosa; Water potential.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000100006
Registros recuperados: 4
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