|
|
|
| Registros recuperados: 14 | |
|
|
| RONQUIM, C. C.. |
| The responses facing specific constraints (e.g. shade, water stress, mineral deficiency) must be quantified in order to estimate the real capacity of each Cerrado species to act as a carbon sinker. Studying several levels of organization at same time it was possible to point out how phenotypic plasticity operates in five young Cerrado woody species, Copaifera langsdorffii Desf, Cybistax antisyphilitica (Mart) Mart., Tabebuia chrysotricha (Mart. ex DC) Mart., Anadenanthera falcata (Benth.) Speg., and Stryphnodendron adstringens (Mart.) Coville, submitted to different irradiance and under transitory increasing of atmosphere CO2 availability. The objective this work are verify the impact of irradiance availability on carbon assimilation and biomass alocation... |
| Tipo: Anais e Proceedings de eventos |
Palavras-chave: Leaf gas exchange; Irradiance; Biomass partitioning. |
| Ano: 2011 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/902506 |
| |
|
| |
|
|
| Souza,João Paulo; Melo,Nayara Magry Jesus; Halfeld,Alessandro Dias; Vieira,Kamilla I. C.; Rosa,Bruno Luan. |
| ABSTRACT Changes in atmospheric CO2 levels are accompanied by ecological interactions involving other environmental factors, such as drought, which can severely alter the water balance of plants, thereby influencing sap flow, gas exchange, and plant growth. The objective of this study was to evaluate the water use economy, leaf gas exchange, and growth of young plants of the species Lafoensia pacari subjected to high concentrations of atmospheric CO2 ([CO2]) and soil water deficit. Increased vapor pressure deficit was observed from 1200 to 1800 hours. Plants under elevated [CO2] exhibited increased leaf photosynthesis, resulting in improved growth. Specific leaf area was lower in plants under high [CO2], mainly after soil water deficit treatment. Daily... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biomass allocation; Leaf gas exchange; Sap flow; Specific leaf area; Water economy. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000300425 |
| |
|
| |
|
|
| Silva, Maria Liliane dos Santos; Sousa, Humberto Gildo de; Silva, Maria Lílian dos Santos; Lacerda, Claudivan Feitosa de; Gomes-Filho, Enéas. |
| Plants are often exposed to abiotic stresses such as salinity, which represents a barrier to the cultivation of agricultural species mainly in arid and semi-arid regions. This study evaluated the development of four saccharine sorghum genotypes for tolerance to different salinity levels under greenhouse conditions. The experimental design was a randomized complete block arranged in a 5 × 4 factorial scheme, which corresponded to five levels of irrigation water salinity [electrical conductivities of 0.5 (control), 2.5, 5.0, 7.5, and 10.0 dS m-1] and four saccharine sorghum genotypes (CSF 11, CSF 15, P 76 and P 298), with five replicates. The plants were evaluated for dry mass production, leaf area, height, stalk diameter, leaf gas exchange and relative... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sorghum bicolor (L.); Leaf gas exchange; Salt stress; Salt tolerance.. |
| Ano: 2019 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42607 |
| |
|
|
| Silva, Maria Liliane dos Santos; Sousa, Humberto Gildo de; Silva, Maria Lílian dos Santos; Lacerda, Claudivan Feitosa de; Gomes-Filho, Enéas. |
| Plants are often exposed to abiotic stresses such as salinity, which represents a barrier to the cultivation of agricultural species mainly in arid and semi-arid regions. This study evaluated the development of four saccharine sorghum genotypes for tolerance to different salinity levels under greenhouse conditions. The experimental design was a randomized complete block arranged in a 5 × 4 factorial scheme, which corresponded to five levels of irrigation water salinity [electrical conductivities of 0.5 (control), 2.5, 5.0, 7.5, and 10.0 dS m-1] and four saccharine sorghum genotypes (CSF 11, CSF 15, P 76 and P 298), with five replicates. The plants were evaluated for dry mass production, leaf area, height, stalk diameter, leaf gas exchange and relative... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sorghum bicolor (L.); Leaf gas exchange; Salt stress; Salt tolerance.. |
| Ano: 2019 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42607 |
| |
|
|
| Braz,Régis dos S.; Lacerda,Claudivan F. de; Assis Júnior,Raimundo N. de; Ferreira,Jorge F. da S.; Oliveira,Adriana C. de; Ribeiro,Aureliano de A.. |
| ABSTRACT The nitrogen fertilization, in general, minimizes the effects of salinity on plants, but the mitigating action depends on plant species, cultivar, soil texture and plant age, among other factors. The objective of this study was to evaluate the effects of irrigation water salinity and nitrogen fertilization on maize physiology and growth (Zea mays) in soils with different textures. The experiment was carried out in a greenhouse in Fortaleza City, CE, Brazil, in PVC soil columns (100 x 20 cm). The design was completely randomized using the factorial 2 x 2 x 4, referring to two soils, an Ultisol and a Quartzipsamment, nitrogen doses of 105 and 210 kg ha-1, under irrigation with saline water of 0.5, 2.0, 4.0 and 6.0 dS m-1, with four repetitions. With... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Leaf gas exchange; Soil texture. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019001200907 |
| |
|
| |
|
| |
|
|
| Bessa,Michele Campos; Lacerda,Claudivan Feitosa; Amorim,Aiala Vieira; Bezerra,Antonio Marcos Esmeraldo; Lima,Alan Diniz. |
| ABSTRACT The aim of this study was to evaluate the salt tolerance and physiological responses of six woody native species of the Caatinga ecosystem, on a soil salinity gradient in a greenhouse. The experimental design was of randomized blocks in a split-plot scheme; six plant species native of the Caatinga in the plots, and five levels of soil salinity in the sub-plots (1.2, 2.7, 4.7, 6.7 and 8.4 dS m-1), with five replications. The results demonstrate that species of the Caatinga ecosystem display a high capacity for adaptation in soils of low and moderate salinity. However, considering the reduction in total dry matter production at the highest salinity level, it was seen that only the species M. urundeuva was tolerant to salinity, and H. impetiginosus... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Salt stress; Caatinga ecosystem; Woody plants; Leaf gas exchange. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902017000100157 |
| |
|
|
| Ribeiro,Rafael Vasconcelos; Machado,Eduardo Caruso; Espinoza-Núñez,Erick; Ramos,Rômulo Augusto; Machado,Daniela Favero São Pedro. |
| Citrus plants were grown under two thermal conditions for evaluating carbon metabolism acclimation to moderate warm temperature (30/20ºC, day/night), and its likely impact on plant growth. As reference, plants were grown at 25/20ºC, in which they were subjected to optimum temperature for photosynthesis during the diurnal period (25ºC). Higher photosynthetic rates were found at 30/20ºC as compared to 25/20ºC in both mature and young leaves, being this response associated with higher stomatal conductance. After 30 days of thermal treatment, plants grown at 30/20ºC presented higher shoot growth as compared to those at 25/20ºC. The carbohydrate concentration decreased in stem and root tissues, while it increased in leaf tissues under moderate warm conditions.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Citrus; Biomass; Carbohydrate; Leaf gas exchange; Acclimation. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202012000100006 |
| |
|
| |
|
| |
|
|
| Lustosa, Bruno Melo; Souza, Lígia Gomes Ferreira; Frosi, Gabriella; Falcão, Hiram Marinho; Pereira, Silvia; Oliveira, Marciel Teixeira; Santos, Mauro Guida. |
| This study aimed to evaluate the leaf primary metabolism in two woody species, Sterculia foetida and Bombacopsis glabra. Both species have seeds rich in oil and they are largely found in regions with irregularities in water availability. Seedlings were grown in a greenhouse from seeds. At 140 days after emergence, 50% of the plants were subjected to salt stress for 23 days, daily receiving 100 mM of NaCl solution. In both species, leaf stomata conductance and water potential decreased quickly under salt stress. The two species showed different strategies in photosynthetic pigment concentration and components of nitrogen metabolism. S. foetida kept the pigment concentration unchanged after 23 days of stress, while B. glabra increased concentration of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Botany; Plant Ecophysiology Biochemical analysis; Leaf gas exchange; Leaf water potential Análises bioquímicas; Trocas gasosas foliares; Potencial hídrico foliar. |
| Ano: 2017 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1332 |
| |
| Registros recuperados: 14 | |
|
|
|
