Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 17
Primeira ... 1 ... Última
Imagem não selecionada

Imprime registro no formato completo
Actual and potential photosynthetic rates of tropical crop species Rev. Bras. Fisiol. Veg.
DA MATTA,FÁBIO M.; LOOS,RODOLFO A.; RODRIGUES,RODRIGO; BARROS,RAIMUNDO S..
The actual (A) and potential (Apot) photosynthetic rates of C3 and C4 tropical crop species grown under greenhouse conditions was compared. The following species were investigated: Oryza sativa, Phaseolus vulgaris, Glycine max, Helianthus annuus, Gossypium hirsutum, Manihot esculenta, Theobroma cacao, Coffea arabica, Hevea brasiliensis, and Eucalyptus urophylla × E. grandis, all from the C3 group, and Amaranthus sp., Panicum maximum, Pennisetum purpureum, Zea mays and Saccharum officinarum, from the C4 group. A, determined under non-limiting light at ambient temperature and CO2, was measured with an infrared gas analyser, whilst Apot, determined under saturating light and CO2 at an optimal temperature (35 ºC for all species), was gauged with a gas-phase...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Carbon assimilation rate; Photosynthetic oxygen evolution; Specific leaf area.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-31312001000100003
Imagem não selecionada

Imprime registro no formato completo
Anatomical and physiological characteristics of two argentine wheat cultivars Ciência Rural
Filgueira,Raúl Roberto; Golik,Inés Silvina; Sarli,Oliverio Guillermo; Jatimliansky,Raúl Jaime.
Two Argentine field grown wheat cultivars (Triticum aestivum L.), Buck Cencerro (BC) with traditional germoplasm, and Buck Pucará (BP) with Mexican germoplasm, have been investigated in order to compare anatomical and physiological characteristics of the flag leaf measured in heading (stage E59), anthesis (stage E69) and kernel water ripe (stage 71). In both cultivars, photosynthetic rate was not different for the same phenological stage, except for E71. Averages in stage E59 were higher than stages E69 and E71 for both cultivars (22.70, 18.40 and 10.40 µmol m-2 s-1 for BP and 23.82, 18.41 and 8.28 µmol m-2 s-1 for BC, respectively). Transpiration rates were higher in BP (5.0, 5.6 and 4.89 mmol m-2 s-1) than BC (3.3, 4.4 and 2.57 mmol m-2 s-1) for stages...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Specific leaf area; Mesophyll area; Carbon dioxide exchange; Transpiration; Leaf anatomy; Conductance.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782003000400008
Imagem não selecionada

Imprime registro no formato completo
Ecological strategies of Al-accumulating and non-accumulating functional groups from the cerrado sensu stricto Anais da ABC (AABC)
Souza,Marcelo C. de; Bueno,Paula C.P.; Morellato,Leonor P.C.; Habermann,Gustavo.
The cerrado's flora comprises aluminum-(Al) accumulating and non-accumulating plants, which coexist on acidic and Al-rich soils with low fertility. Despite their existence, the ecological importance or biological strategies of these functional groups have been little explored. We evaluated the leaf flushing patterns of both groups throughout a year; leaf concentrations of N, P, K, Ca, Mg, S, Al, total flavonoids and polyphenols; as well as the specific leaf area (SLA) on young and mature leaves within and between the groups. In Al-accumulating plants, leaf flushed throughout the year, mainly in May and September; for non-accumulating plants, leaf flushing peaked at the dry-wet seasons transition. However, these behaviors could not be associated with...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aluminum; Community; Herbivory; Mineral nutrition; Phenology; Specific leaf area.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000200813
Imagem não selecionada

Imprime registro no formato completo
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
Imagem não selecionada

Imprime registro no formato completo
Evidence of the effects of fire on branching and leaf development in cerrado trees Acta Botanica
Souza,João Paulo; Albino,Ana Lúcia S.; Prado,Carlos Henrique B. A..
ABSTRACT We discuss evidence of effects of an accidental fire on shoot growth and leaf development in six cerrado tree species with distinct leaf phenologies. Buds of all six species were marked before shoot and leaf emergence in the dry season. After fire, leaf and shoot growth were monitored weekly and specific leaf area (SLA) was determined. Shoot order was determined in the growing season. Evergreens and semideciduous woody species had rapid leaf and shoot growth and decreased leaf life span (LLS) after fire compared with published data for evergreens in cerrado areas without fire. On the other hand, Kielmeyera variabilis, a deciduous species, showed intense branching and produced two orders of shoots in one growing season. Fires promote rapid leaf and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Disturbance; Leaf life span; Shoot growth; Specific leaf area; Shoot order.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000400677
Imagem não selecionada

Imprime registro no formato completo
Growth and biomass allocation of the C4 grasses Brachiaria brizantha and B. humidicola under shade PAB
DIAS-FILHO,MOACYR BERNARDINO.
The growth and biomass allocation responses of the tropical forage grasses Brachiaria brizantha cv. Marandu and B. humidicola were compared for plants grown outdoors, in pots, in full sunlight and those shaded to 30% of full sunlight over a 30day period. The objective was to evaluate the acclimation capacity of these species to low light. Both species were able to quickly develop phenotypic adjustments in response to low light. Specific leaf area and leaf area ratio were higher for low-light plants during the entire experimental period. Low-light plants allocated significantly less biomass to root and more to leaf tissue than high-light plants. However, the biomass allocation pattern to culms was different for the two species under low light: it increased...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Specific leaf area; Growth rate; Pastures; Light regimes.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2000001200003
Imagem não selecionada

Imprime registro no formato completo
Growth, biomass allocation and photosynthesis of Rolandra fruticosa (asteraceae) in response to shade Planta Daninha
Dias-Filho,Moacyr B.; Chagas Júnior,Aloisio F..
The effects of shade on growth, biomass allocation patterns and photosynthetic response was examined for Rolandra fruticosa (L.) Kuntze, a common perennial weed shrub in cultivated pastures and agricultural areas of Brazilian Amazonia, for plants grown in full sunlight and those shaded to 30 % of full sunlight over a 34-d period. Specific leaf area and leaf area ratio were higher for shade plants during all the experimental period. Shade plants allocated significantly less biomass to root tissue than sun plants and relative growth rate was higher in sun plants. Sun leaves had significantly higher dark respiration and light saturated rates of photosynthesis than shade leaves. The apparent quantum efficiency was higher for shade leaves, while light...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Specific leaf area; Leaf area ratio; Growth analysis; Tropics.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582000000100007
Imagem não selecionada

Imprime registro no formato completo
Higher crop performance of rice hybrids than of elite inbreds in the tropics: 1. Hybrids accumulate more biomass during each phenological phase International Rice Research Institute
Bueno, C. S.; Lafarge, T..
Article in press
Tipo: Article Palavras-chave: Shoot biomass accumulation; Crop and organ growth rate; Hybrid rice; Maturity group; Harvest index; Tillering; Specific leaf area.
Ano: 2009 URL: http://hdl.handle.net/10269/1378
Imagem não selecionada

Imprime registro no formato completo
Leaf anatomical traits of non-arboreal savanna species along a gradient of tree encroachment Acta Botanica
Pinheiro,Luiz Felipe Souza; Kolb,Rosana Marta; Rossatto,Davi Rodrigo.
ABSTRACT In the Brazilian savanna (Cerrado of Brazil), fire suppression has transformed typical savanna formations (TS) into forested savanna (FS) due to the phenomenon of encroachment. Under encroachment, non-arboreal plants begin to receive less light due to greater tree density and canopy closure. Here we aim to evaluate if leaf anatomical traits of non-arboreal species differ according to the degree of tree encroachment at the Assis Ecological Station - São Paulo, Brazil. To this end, we evaluated leaf tissue thickness and specific leaf area (SLA) in representative non-arboreal species occurring along a gradient of tree encroachment. Leaves of TS species showed a trend towards xeromorphism, with traits reported to facilitate survival under high...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Canopy closure; Cerrado; Fire suppression; Light; Specific leaf area.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000100028
Imagem não selecionada

Imprime registro no formato completo
Leaf and fruiting phenology and gas exchange of Mangabeira in response to irrigation Braz. J. Plant Physiol.
Lobo,Francisco de A.; Campelo Junior,José H.; Rodríguez-Ortíz,Carmen E.; Lucena,Isabela C. de; Vourlitis,George L..
The mangabeira (Hancornia speciosa Gómez) is a native species of Brazil occurring in the savanna (Cerrado) and Atlantic Coastal forests. It is a promising species for large-scale horticulture due to the high-protein properties of its fruits, but extensive cultivation has not yet been accomplished. Research is still needed to determine cultivation techniques that will optimize productivity. As irrigation is considered to be the most important agronomic technique to enhance productivity, the goal of this investigation was to evaluate the effects of irrigation on leaf gas exchange (net photosynthesis rate and transpiration rate) and foliar and fruiting phenology. Our results suggest that irrigation acts by increasing the growth and fruit production of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hancornia speciosa; Neotropical savanna; Photosynthesis; Specific leaf area.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000100001
Imagem não selecionada

Imprime registro no formato completo
Leaf life spans of some conifers of the temperate forests of South America RChHN
LUSK,CHRISTOPHER H..
Interspecific variation in leaf life span has wide-ranging implications for plant species sorting on resource availability gradients, and for ecosystem processes such as nutrient cycling. Very little is known about leaf life spans of evergreen trees in the temperate forests of South America. Leaf life spans were estimated by static demographic methods, and associated leaf traits measured, for four conifers of this region. It was expected that leaf life span variation would correlate negatively with soil fertility of habitats normally occupied by each species. This prediction was upheld by the data. The mean leaf life span determined for Araucaria araucana (24 years) is among the highest figures reported for any plant species. This extreme leaf longevity...
Tipo: Journal article Palavras-chave: Araucaria araucana; Leaf longevity; Leaf nitrogen; Podocarpus; Resource gradients; Specific leaf area.
Ano: 2001 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000300017
Imagem não selecionada

Imprime registro no formato completo
Leaf optical properties as affected by shade in saplings of six tropical tree species differing in successional status Braz. J. Plant Physiol.
Souza,Rogéria Pereira; Válio,Ivany F. M..
Tree species differing in successional status may present different responses to shade. Adjustments at leaf level may affect their optical properties, leading to changes in PAR (photosynthetically active radiation) absorbance. The aim of this study was to evaluate leaf optical properties as affected by understory shade in saplings of six tropical tree species differing in successional status and degree of shade tolerance. Chlorophyll content and specific leaf area (SLA) were also evaluated. The effects of shade on leaf optical properties and chlorophyll content differed among the studied species, whereas increased SLA was a common response for all species, reflecting the occurrence of thinner leaves under shade. The three studied shade-tolerant species -...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Chlorophyll; Leaf absorbance; Shade tolerance; Specific leaf area; Successional species.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202003000100007
Imagem não selecionada

Imprime registro no formato completo
Leaf optical properties of two liana species Canavalia parviflora Benth. and Gouania virgata Reissk in different light conditions Rev. Bras. Bot.
Sanches,Maria Cristina; Válio,Ivany Ferraz Marques.
Lianas are plants that depend on support to reach some appreciable height, and they represent an important structural component of tropical forests. Although they predominate in clearings and gaps, some species survive in the understory. Changes in irradiance between these environments can affect leaf morphology and absorption of photosynthetic active radiation (PAR). We had examined the effects of different light regimes on leaf optical properties, chlorophyll content, specific leaf area, and leaf surface morphology in young seedlings of Canavalia parviflora Benth. (Fabaceae) and Gouania virgata Reissk (Rhamnaceae). The seedlings were distributed on workbenches covered by different layers of neutral shade netting, thus creating three levels of light...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Leaf absorptance; Lianas; Light conditions; Reflectance; Specific leaf area.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042006000200013
Imagem não selecionada

Imprime registro no formato completo
Physiological response of Solanum crinitum Lam. to contrasting light environments. Repositório Alice
DIAS FILHO, M.B..
Investigou-se, durante 66 dias, em camaras de crescimento, sob alto (800-1000 umol m2 s-1) e baixo (200-350 umol-2s-1) regimes de luz, a fisiologia, a morfologia e o crescimento de Solanum crinitum, uma especie arborea pioneira de porte medio, comum como planta invasora de pastagens, areas agricolas abandonadas, e clareiras em areas de floresta na Amazonia brasileira. O objetivo foi estudar a aclimatacao dessa especie ao sombreamento. A taxa de crescimento relativo foi inicialmente (22d) similar entre regimes de luz, tornando-se semelhante entre tratamentos nas avaliacoes subsequentes (44 e 66 d)> A razao de area foliar e a area foliar especifica foram maiores na BR. A proporcao de biomassa alocada nas folhas foi semelhante entre tratamentos, enquanto...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Alocacao de biomassa; Analise de crescimento; Fotossintese; Nitrogenio foliar; Allocation; Patterns; Growth analysis; Photosynthesis; Specific leaf area; Leaf nitrogen content; Amazonia.
Ano: 1997 URL: http://www.alice.cnptia.embrapa.br/handle/doc/95511
Imagem não selecionada

Imprime registro no formato completo
Plant- and stand-level variation in biophysical and physiological traits along tree density gradients in the Cerrado Braz. J. Plant Physiol.
Scholz,Fabian G.; Bucci,Sandra J.; Goldstein,Guillermo; Meinzer,Frederick C.; Franco,Augusto C.; Salazar,Ana.
The objective of this study was to characterize and understand morphological and physiological variation in traits related to water economy, at the plant and stand level, along a gradient of tree density in a Neotropical savanna (Cerrado). Cerrado plots subjected to long-term fertilization and gallery forests were also included in the analysis to expand the axes of ecosystem variation. Consistent changes in stand level biophysical traits observed along the gradient of increasing tree density included a decrease in weighted-average wood density, and increases in leaf surface area per plant, leaf specific hydraulic conductivity, specific leaf area and stomatal conductance. A conceptual model of biophysical, morphological and physiological trait interactions...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Gallery forest; Hydraulic architecture; Nutrients; Savannas; Specific leaf area; Wood density.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000300006
Imagem não selecionada

Imprime registro no formato completo
The importance of evolutionary history in studies of plant physiological ecology: examples from cerrados and forests of central Brazil Braz. J. Plant Physiol.
Hoffmann,William A.; Franco,Augusto C..
Studies that compare physiology, anatomy, and ecology across species have offered some of the best insight into adaptation and evolutionary constraints in plants. As a result, the comparative approach has become increasingly used in studies of plant physiological ecology. The high species diversity of Brazilian biomes provides many excellent opportunities for comparative plant ecophysiology, and could be better exploited for understanding the evolution of plant form and function. In this paper we emphasize the importance of considering phylogenetic information for the design and analysis of comparative studies, relying on examples from comparisons of woody plants from cerrado and gallery (riparian) forests. The use of congeneric species pairs, each...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cerrado; Forest; Specific leaf area; Leaf area ratio; Phylogeny.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202008000300008
Imagem não selecionada

Imprime registro no formato completo
The length of the dry season may be associated with leaf scleromorphism in cerrado plants Anais da ABC (AABC)
SOUZA,MARCELO C.; FRANCO,AUGUSTO C.; HARIDASAN,MUNDAYATAN; ROSSATTO,DAVI R.; ARAÚJO,JANAÍNA F. DE; MORELLATO,LEONOR P.C.; HABERMANN,GUSTAVO.
Despite limitations of low fertility and high acidity of the soils, the cerrado flora is the richest amongst savannas. Many cerrado woody species show sclerophyllous leaves, which might be related to the availability of water and nutrients in the soil. To better understand the function and structure of cerrado vegetation within its own variations, we compared two cerrado communities: one in its core region in central Brazil (Brasília, DF) and the other on its southern periphery (Itirapina, SP). We contrasted the length of the dry season, soil fertility rates, leaf concentrations of N, P, K, Ca and Mg and the specific leaf area (SLA) between these communities. The dry season was shorter on the periphery, where the soil was more fertile although more acidic....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Savanna; Mineral nutrition; Rainfall seasonality; Specific leaf area.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000401691
Registros recuperados: 17
Primeira ... 1 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional