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Registros recuperados: 14
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Brazilian savanna (cerrado) area could be an important continental sink to CO2. Repositório Alice
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: Resumo em anais de congresso (ALICE) Palavras-chave: Leaf gas exchange; Irradiance; Biomass partitioning.
Ano: 2011 URL: http://www.alice.cnptia.embrapa.br/handle/doc/902506
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Ecophysiology of coconut palm under water stress Braz. J. Plant Physiol.
Gomes,Fábio P.; Prado,Carlos H.B.A..
Coconut palm is of great social and economic importance for millions of people in the tropics and subtropics. Drought is one of the main environmental factors that limit coconut productivity. In this review, physiological and morphological data are presented in an integrated perspective to provide a holistic view of the behavior of coconut trees facing water deficit under both field and controlled conditions. Great capacity to produce homorhizic roots capable of searching continuously for water and nutrients and high protoplasmic tolerance in leaves allows the coconut tree to endure water deficit. High membrane stability, osmoprotection, osmoregulation and enhanced activity of antioxidant enzymes are characteristics often found in leaves of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cocus nucifera; Desiccation tolerance; Leaf gas exchange; Leaf water relations; Net photosynthesis; Osmotic potential; Water potential; Water-use efficiency.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202007000400008
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Elevated atmospheric CO2 concentration improves water use efficiency and growth of a widespread Cerrado tree species even under soil water deficit Acta Botanica
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
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Fósforo como possível mitigador dos efeitos da deficiência hídrica sobre o crescimento e as trocas gasosas de Brachiaria brizantha cv. MG-5 Vitória - DOI: 10.4025/actasciagron.v31i2.836 Agronomy
Kuwahara, Frank Akiyoshi; UNOESTE; Souza, Gustavo Maia; UNOESTE.
A deficiência é um dos principais fatores limitantes da agricultura restringindo as taxas fotossintéticas das plantas e seu crescimento. Pela importância econômica das pastagens tropicais, que também sofrem com o problema de períodos de deficiência hídrica, este estudo teve como objetivo verificar os efeitos de diferentes doses de fósforo (24, 50, 100 e 150 mg P DM-3) combinadas com dois regimes de irrigação (com e sem déficit hídrico) sobre as trocas gasosas foliares e o crescimento de B. brizantha cv. MG-5 Vitória. O experimento foi realizado em casa-de-vegetação, com quatro repetições por tratamento, e a deficiência hídrica foi imposta por suspensão da irrigação em plantas com 50 dias de idade após a germinação. Um tratamento-controle foi mantido com...
Palavras-chave: 5.01.00.00-9 Agronomia Brachiaria brizantha; Crescimento; Fósforo; Deficiência hídrica; Trocas gasosas Brachiaria brizantha. growth; Phosphorus; Water deficit; Leaf gas exchange.
Ano: 2009 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/836
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Growth and photosynthetic parameters of saccharine sorghum plants subjected to salinity Agronomy
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
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Growth and photosynthetic parameters of saccharine sorghum plants subjected to salinity Agronomy
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
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Growth and physiology of maize under water salinity and nitrogen fertilization in two soils AGRIAMBI
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
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Growth, photosynthesis and leaf water potential in young plants of Copaifera langsdorffii Desf. (Caesalpiniaceae) under contrasting irradiances. Repositório Alice
RONQUIM, C. C.; PRADO, H. B. A. P.; SOUZA, J. P. de.
Growth and leaf nutrient content were compared in young potted plants of Copaifera langsdorffii in sunny and shaded areas without water stress. Besides, carbon assimilation and leaf water relations were evaluated by net photosynthesis, potential photochemical efficiency and water potential during dally courses in dry and rainy periods under natural conditions in both contrasting irradiances. Higher values of total biomass, height and leaf area occurred in sunny than in shaded area. On the other hand, all young plants survived in shade under natural water stress probably by reason of fast and intense biomass accumulation in favor of roots in early development. There was no significant difference about nutrient concentration in leaves between plnats growing...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Cerrado; Biomass partitioning; Chlorophyll fluorescense; Leaf gas exchange; Irradiance; Sunflecks.
Ano: 2009 URL: http://www.alice.cnptia.embrapa.br/handle/doc/662613
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Growth, photosynthesis and leaf water potential in young plants of Copaifera langsdorffii Desf. (Caesalpiniaceae) under contrasting irradiances Braz. J. Plant Physiol.
Ronquim,Carlos Cesar; Prado,Carlos Henrique B. A.; Souza,João Paulo de.
Growth and leaf nutrient content were compared in young potted plants of Copaifera langsdorffii in sunny and shaded areas without water stress. Besides, carbon assimilation and leaf water relations were evaluated by net photosynthesis, potential photochemical efficiency and leaf water potential during daily courses in dry and rainy periods under natural conditions in both contrasting irradiances. Higher values of total biomass, height and leaf area occurred in sunny than in shaded area. On the other hand, all young plants survived in shade under natural water stress probably by reason of fast and intense biomass accumulation in favor of roots in early development. There was no significant difference about nutrient concentration in leaves between plants...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cerrado; Biomass partitioning; Chlorophyll fluorescence; Leaf gas exchange; Irradiance; Sunflecks.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000300004
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Mechanisms of salt tolerance in seedlings of six woody native species of the Brazilian semi-arid Rev. Ciênc. Agron.
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
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Moderate warm temperature improves shoot growth, affects carbohydrate status and stimulates photosynthesis of sweet orange plants Braz. J. Plant Physiol.
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
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Morphological and photosynthetic adaptations of Tabebuia aurea seedlings in the nursery AGRIAMBI
Gonçalves,Eduardo R; Souza,Felipe C.; Santos,Luan N. dos; Silva,José V.; Ferreira,Vilma M.; Endres,Lauricio.
Tabebuia aurea (Benth. & Hook. f. ex S. Moore) (Bignoniaceae) is a boreal species common in Brazil. It is used for ornamental parks and along sidewalks. Its timber is also used for furniture. The objective of this study was to evaluate the effect of nursery shading on the growth and photosynthesis of T. aurea and their photosynthetic adaptation after being transferred to direct sunlight. The T. aurea seedlings were grown under 0, 50, 70 or 95% shade. The photosynthetic active radiation and leaf gas exchange were measured over two distinct periods: 51 (young seedlings) and 70 days after having been sown under each shade treatment. Immediately after the measurements were taken, the seedlings were transferred into full sunlight and the measurements...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bignoniaceae; Nursery; Atlantic Forest; Leaf gas exchange.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662013001100011
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Photosynthetic responses of four tropical tree species grown under gap and understorey conditions in a semi-deciduous forest Rev. Bras. Bot.
Souza,Gustavo M.; Sato,Agnaldo M.; Ribeiro,Rafael V.; Prado,Carlos Henrique B. A..
Leaf CO2 assimilation (A) as a function of photosynthetic photon flux density (Q) or intercellular CO2 concentration (Ci) and chlorophyll fluorescence measurements were carried out on four tropical woody species growing in forest gap and understorey (Bauhinia forficata Link. and Guazuma ulmifolia Lam. as pioneers, and Hymenaea courbaril L. and Esenbeckia leiocarpa Engl. as non-pioneers). Chlorophyll fluorescence indicated similar acclimation capacities of photochemical apparatus to contrasting light environments irrespective to plant species. Maximum CO2 assimilation and quantum yield derived from A/Q curves indicated higher photosynthetic capacity in pioneer than in non-pioneer species in forest gap. However, the differences among species did not show a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Acclimation; Chlorophyll fluorescence; Forest succession; Leaf gas exchange; Photosynthetic response curves.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042010000400002
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Strategies of two tropical woody species to tolerate salt stress PFB - Pesquisa Florestal Brasileira
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
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