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Registros recuperados: 6
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Reconstrução de maquetes 3D e manipulação da arquitetura de espécies perenes cultivadas no Brasil PAB
Rakocevic,Miroslava; Silva,Murilo Hilário Mazza da; Assad,Eduardo Delgado; Megeto,Guilherme Augusto Silva.
Este trabalho teve como objetivo indicar algumas possíveis manipulações ecofisiológicas, com base em experimentos de arquitetura de plantas. Plantas de erva-mate, seringueira e videira foram caracterizadas no campo e no laboratório, e suas maquetes 3D foram reconstruídas com os programas V-Plants e PlantGLViewer. Indicações sobre a análise de crescimento e impactos ambientais, com a aplicação de diversas simulações, foram discutidas.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hevea brasiliensis; Ilex paraguariensis; Vitis labrusca; Arquitetura de plantas; Modelagem.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2008000900019
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Heliotropic responses of soybean cultivars at three phenological stages and under two water regimes PAB
Rakocevic,Miroslava; Neumaier,Norman; Oliveira,Gustavo Migliorini de; Nepomuceno,Alexandre Lima; Farias,José Renato Bouças.
The objectives of this work were to determine the heliotropic movements of the upper trifoliates for two soybean cultivars, BR 16 and Embrapa 48, during a daily cycle, in three phenological stages and two water regimes, and to estimate the impact of irrigation and daily leaflet movements on agronomic characteristics and grain yield. Heliotropic movements were studied in three phenological stages: V4-V6, V7-V10, and R5 in irrigated and non-irrigated plots. For each stage, the leaflet elevation and azimuth were measured hourly. Under a low (V4-V6 stage) and mid (V7-V10 stage) leaf area index (LAI) the diaheliotropism was slightly more frequent and intensive in non-irrigated than in irrigated plants, only at early morning and late afternoon hours. At R5 stage...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Glycine max; Diaheliotropism; Irrigation; Leaf area index; Paraheliotropism.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010000700005
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Software for interpolation of vegetative growth of yerba mate plants in 3D PAB
Silva,Murilo Hilário Mazza da; Rakocevic,Miroslava.
The objective of this work was to build mock-ups of complete yerba mate plants in several stages of development, using the InterpolMate software, and to compute photosynthesis on the interpolated structure. The mock-ups of yerba-mate were first built in the VPlants software for three growth stages. Male and female plants grown in two contrasting environments (monoculture and forest understory) were considered. To model the dynamic 3D architecture of yerba-mate plants during the biennial growth interval between two subsequent prunings, data sets of branch development collected in 38 dates were used. The estimated values obtained from the mock-ups, including leaf photosynthesis and sexual dimorphism, are very close to those observed in the field. However,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ilex paraguariensis; AMAPmod; Modeling; Plant architecture; Plant growth; 3D reconstruction.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010000300003
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N sources affect growth, nutrient content, and net photosynthesis in maté (Ilex paraguariensis St. Hil.) BABT
Gaiad,Sérgio; Rakocevic,Miroslava; Reissmann,Carlos Bruno.
The influence of different N sources on the growth of maté (Ilex paragurariensis St.Hil.) seedlings grown in greenhouse was studied. All seedlings received a base fertilization of 10 mg N.kg-1 soil as NH4NO3, 60 mg P2O5.and 40 mg K2O.kg-1 soil as KH2PO4 15 days before treatments application. Treatments were as follow: Control, with no extra N added; Urea = 100 mg N.kg-1 soil as Urea; NO3- = 100 mg N.kg-1 soil as Ca(NO3)2; and NH4+ = 100 mg N.kg-1 soil as (NH4)2SO4. It was concluded that: 1) increasing N content in leaves alone was not able to promote gain in biomass production of maté seedlings; 2) seedlings receiving N-NH4 showed a higher accumulation of P and Mg on shoot biomass; and 3) an increase in leaf area, leaf number and net photosynthesis...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ammonium; Nitrate; Soil pH.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000600001
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Intensity of bitterness of processed yerba mate leaves originated in two contrasted light environments BABT
Rakocevic,Miroslava; Medrado,Moacir José Sales; Lucambio,Fernando; Valduga,Alice Teresa.
The bitterness intensity of beverage prepared from the leaves produced on the males and females of yerba mate (Ilex paraguariensis), grown in the forest understory and monoculture, was evaluated. The leaves were grouped by their position (in the crown and on the branch tips) and by the leaf age. The leaf gas exchange, leaf temperature and photosynthetic photon flux density were observed. Inter and intra-specific competition for light and self-shading showed the same effect on yerba mate beverage taste. All the shading types resulted in bitterer taste of the processed yerba mate leaves compared to the leaves originated under the direct sun exposure. The leaves from the plants grown in the monoculture showed less bitterness than those grown in the forest...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Leaf age; Photosynthesis; Shade; Stomatal conductance; Temperature; Transpiration.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000300018
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Morphological and physiological responses of Cedrela Fissilis Vellozo (Meliaceae) seedlings to light BABT
Santos,Débora Leonardo dos; Rakocevic,Miroslava; Takaki,Massanori; Ribaski,Jorge.
Seeds of Cedrela fissilis Vellozo were planted and maintained under two distinct conditions: at east border of a forest with red: far-red ratio of 1.15 and under canopy with photosynthetic photon flux density of 0.22-7% of full sun radiation and red: far-red ratio of 0.21-0.36. Seedling growth (height and stem diameter) was faster under sun, the development of roots more continuous and the number of leaves almost twice of that of shade plants. The leaf area was 10 times greater in sun plants with 15-25 leaflets per leaf while under shade only 5 to 10 leaflets were found per leaf. In shade plants, a higher proportion of dry mass was found in aerial parts. Leaves of sun plants had the capacity of gas exchange to respond to high light radiation, but leaves...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Photosynthesis; Seedling morphogenesis; Shade.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000100020
Registros recuperados: 6
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