|
|
|
| Registros recuperados: 220 | |
|
|
| Jara-Rojas,Francisco; Ortega-Farías,Samuel; Valdés-Gómez,Héctor; Poblete,Carlos; del Pozo,Alejandro. |
| The coupled model of assimilation and stomatal conductance (A-g s) was evaluated to estimate leaf stomatal conductance of a drip-irrigated vineyard (Vitis vinifera L. cv. Cabernet Sauvignon) located in the Pencahue Valley (35º22 S, 71°47 W, 150 m.a.s.l.), Maule Region, Chile, during the 2003-2004 and the 2004-2005 growing seasons. Additionally, a calibration of the three parameters mesophyll conductance (g m), maximum specific humidity (Dmax) and coupled factor (f0) was applied on vines growing in 35 L pots. An infrared gas analyzer was used to calibrate and evaluate the A-g s which allowed simultaneous measuring of the leaf net CO2 assimilation (A) and stomatal conductance (g s) in 2 to 3 h intervals of time. The calibration indicated that the g m,,... |
| Tipo: Journal article |
Palavras-chave: A-g s model; Photosynthesis; Mesophyll conductance; Stem water potential; Sensitivity analysis. |
| Ano: 2009 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000100011 |
| |
|
|
| de Carvalho,Leonardo Bianco; Aguiar Alves,Pedro Luis da Costa; Bianco,Silvano; De Prado,Rafael. |
| Glyphosate is the main herbicide used in coffee (Coffea arabica L.) plantations in Brazil. Problems with herbicide drift commonly occur in orchard fields due to non-adequate spraying conditions. A series of experiments was carried out aiming to evaluate physiological dose-response of C. arabica plants submitted to exposure to simulated glyphosate drift in two distinct plant growth stages. Glyphosate was applied at 0, 180, 360, and 720 g acid equivalent (AE) ha-1 directly on coffee plants with 10 and 45 d after transplanting (DAT). Glyphosate doses in a range of 180-360 g AE ha-1 increased photosynthesis, transpiration and stomatal conductance in 10 DAT-plants up to 14 d after application (DAA) while, in 45 DAT-plants, an increase was observed only up to 2... |
| Tipo: Journal article |
Palavras-chave: N-(phosphonomethyl) glycine; Herbicide drift; Photosynthesis; Plant nutrition. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000200003 |
| |
|
|
| Bastías,Richard M; Manfrini,Luigi; Corelli Grappadelli,Luca. |
| The effect of shading (i.e. reduction of sunlight availability) on fruit growth physiology has been widely studied in apple (Malus domestica Borkh.), but little knowledge exist about fruit growth responses to changes in the light spectrum. The aim of the present research was to study the effect of use of colored nets with differential sunlight transmission in the blue (B, 400-500 nm), red (R, 600-700 nm) and far-red (FR, 700-800 nm) spectra on apple fruit growth and physiological associated responses. Three year old 'Fuji' apple trees were covered with 40% photo-selective blue and red shade nets, 40% neutral grey shade net, and 20% neutral white net as control. Red and blue net reduced in the same proportion (27%) the photosynthetically active radiation... |
| Tipo: Journal article |
Palavras-chave: Sunlight spectrum management; Fruit size; Photosynthesis; Morphogenesis. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000200010 |
| |
|
|
| Ibarra-Jiménez,Luis; Valdez-Aguilar,Luis Alonso; Cárdenas-Flores,Antonio; Lira-Saldivar,Hugo; Lozano-del Río,Javier; Lozano Cavazos,Carlos. |
| There are numerous studies of the use of plastic mulches in vegetable production, but there is little documentation of their use with dry beans (Phaseolus vulgaris L.) in single and double cropping. The objective of this study was to grow dry beans over two consecutive growing seasons using the same plastic mulch of different colors and examine the influence of soil temperature on growth and yield. The experiment was conducted in Saltillo, Coahuila, Mexico, in the spring and summer of 2008. The treatments included four colored plastic mulches: white-on-black, black, silver-on-black, aluminum-on-black, and bare soil as a control. The experimental design was a randomized complete block with four replicates. The percentage of photosynthetically active... |
| Tipo: Journal article |
Palavras-chave: Phaseolus vulgaris; Soil temperature; Photosynthesis; PAR; Plasticulture. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000400002 |
| |
|
|
| Donoso,Sergio; Peña-Rojas,Karen; Pacheco,Cristian; Durán,Sergio; Santelices,Rómulo; Mascaró,Cristóbal. |
| Acacia caven (Mol.) Mol. (Leguminosae), generally known as "espino," is one of the most common tree species in the Mediterranean region of Chile. This species grows in nutritionally poor soils with low water availability during the summer, so it is very difficult for new seedlings to become established. To investigate the effects of water restriction and the potential benefit of the application of biosolids (sludge bio-dried to 25% moisture) on the growth of the plant, a completely random, two x three factorial design was carried out in controlled nursery conditions under two irrigation regimes (well-watered plants and controlled water restriction) and three biosolid application rates (0:100, 10:90 and 20:80) in a clay substrate. Physiological evaluations... |
| Tipo: Journal article |
Palavras-chave: Biomass; Predawn water potential; Photosynthesis; Shoot:root ratio; Water restriction. |
| Ano: 2015 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202015000200013 |
| |
|
|
| Streck,Nereu Augusto. |
| The amount of carbon dioxide (CO2) of the Earth´s atmosphere is increasing, which has the potential of increasing greenhouse effect and air temperature in the future. Plants respond to environment CO2 and temperature. Therefore, climate change may affect agriculture. The purpose of this paper was to review the literature about the impact of a possible increase in atmospheric CO2 concentration and temperature on crop growth, development, and yield. Increasing CO2 concentration increases crop yield once the substrate for photosynthesis and the gradient of CO2 concentration between atmosphere and leaf increase. C3 plants will benefit more than C4 plants at elevated CO2. However, if global warming will take place, an increase in temperature may offset the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Global warming; Photosynthesis; Agriculture; Food supply. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782005000300041 |
| |
|
|
| Carvalho,Luciana Marques de; Carvalho,Hélio Wilson Lemos de; Oliveira,Ivênio Rubens de; Rangel,Marco Antônio Sedrez; Santos,Vanderlei da Silva. |
| ABSTRACT: Ten cassava cultivars were grown in the field and evaluated to identify the most adapted to the Coastal Tablelands of northeast Brazil. The cultivars showed differences in proline and chlorophyll contents, plant height, number of leaves and branches, canopy area and root production, however they did not differ on photosynthetic rates. Cultivars 'Tianguá' and '9783-13' presented lower root yield, whereas 'BRS Tapioqueira' and 'Irará' had the highest root yield. Few leaves coupled with the highest water use efficiency for CO2 assimilation was found in 'BRS Kiriris' in contrast to 'BRS Jarina' and '9783-13'. 'BRS Caipira' had high proline content in both Umbaúba and Frei Paulo areas, traits usually associated to drought tolerance, that contribute to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Manihot esculenta; Adaptation; Osmotic adjustment; Photosynthesis; Chlorophyll. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000500796 |
| |
|
| |
|
|
| Bueno,Adeney de Freitas; Zechmann,Benjamin; Hoback,William Wyatt; Bueno,Regiane Cristina Oliveira de Freitas; Fernandes,Odair Aparecido. |
| Serpentine leafminers, Liriomyza spp. (Diptera: Agromyzidae), are polyphagous insects that feed on numerous crops worldwide including potato. Recently, leafminer larvae (Liriomyza trifolii) have become an economically important pest of potato. The larvae eat the mesophyll of leaflets leaving long winding tunnels inside the leaflets. The photosynthetic effects of larval tunneling on the remaining leaf tissue are unknown. In 2003, physiological responses of potato to leafminer, L. trifolii were evaluated in Kearney, Nebraska, USA. The leaflets were examined 7 and 14 days post infestation for leaf area injury, photosynthetic rates and fluorescence. Leafminers caused up to 13% leaf area loss due to leafminer injury with no effect on the photosynthetic rates of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Plant-insect interaction; Chemical control; Photosynthesis. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782007000600001 |
| |
|
|
| Cui,Cui; Xie,Xurong; Wang,Liu-Yan; Wang,Rui-Li; Lei,Wei; Lv,Jun; Chen,Liuyi; Gao,Huan-Huan; Ye,Sang; Huang,Linya; Zhou,Qing-Yuan. |
| ABSTRACT: Herbicide application is an effective weed control method for mitigating crop yield loss; however, herbicide overuse can cause toxicity in non-target plants. The present study evaluated the effects of glufosinate at recommended dose for agricultural application (0.45 kg ha-1) and at overuse dose (0.90 kg ha-1) glufosinate application on photosynthetic performance and nitrogen assimilation of the rapeseed varieties D148 and Zhongshuang 11 (ZS11). Both glufosinate concentrations significantly decreased the content of chlorophyll and nitrogenous compounds, except free proline, and the activity of glutamine synthetase and glutamate synthase, and increased the activity of glutamic acid dehydrogenase in both varieties. When the concentration of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Residual glufosinate; Rapeseed; Seedling transplanted; Photosynthesis; Nitrogen assimilation. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782020000400251 |
| |
|
| |
|
| |
|
|
| Soares,André Brugnara; Bernardon,Angela; Aiolfi,Ricardo Beffart. |
| ABSTRACT: In this study, it was evaluated the effect of shade on forage yield, rate of CO2 assimilation, and the quality of annual ryegrass ( Lolium multiflorum L.) cv. 'BRS Ponteio' and black oat ( Avena strigosa Schreb) cv. 'IAPAR 61', grown under three shading conditions (0%, 25%, and 50% shade) using slatted wooden structures. The experimental design was completely randomized with four replications. Slatted structures were efficient in simulating the proposed shading conditions. Shading plants significantly decreased forage yield and CO2 assimilation by both species. Ryegrass cv. 'BRS Ponteio' performed better under shade, with higher forage production under all shading conditions. Rate of CO2 assimilation was reduced by 13 and 22 percentage points... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Grass; Light restriction; Photosynthesis; Silvopastoral system. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000601064 |
| |
|
| |
|
|
| Moscôso,Janielly Silva Costa; Silva,Leandro Souza da; Tarouco,Camila Peligrinotti; Nicoloso,Fernando Teixeira; Severo,Fabiane Figueiredo; Aita,Natália Tobin; Prigol,Luís Henrique Ferreira. |
| ABSTRACT: Rhizospheric carbon resulting from root exudation is one of the substrates used by the soil microbiota, and reflects methane (CH4) emissions in anoxic environments such as irrigated rice cultivation. With the increase of the photosynthetic capacity of the plant in the reproductive period, there is greater accumulation of biomass which, in turn, increases the rate of root exudation. However, genotypic variations in the physiological aspects of rice plants may be related to the amount of root exudates. Ten cultivars of irrigated rice were evaluated for the exudation rate of total organic carbon (EXRToc), shoot dry matter (SDM), and physiological variables related to photosynthesis during the full flowering (blooming) period. Two experiments were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Photosynthesis; Exudates; Methanogenesis. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782018001200250 |
| |
|
|
| Deus,Bruna Corrêa da Silva de; Figueiredo,Fábio Afonso Mazzei Moura de Assis; Almeida,Luciana Venturotti Braun de; Ferraz,Tiago Massi; Martins,Amanda Oliveira; Rodrigues,Weverton Pereira; Viana,Leandro Hespanhol; Esteves,Barbara dos Santos; Campostrini,Eliemar. |
| ABSTRACT: New techniques in tropical regions such as use of transparent plastic covering (TPC), have been employed in grapes to avoid the wetting leaves and fruits, which can reduce the occurrence of fungal diseases, reduce the use of sprays, and reduce damage caused by hail and high winds. TPC may significantly affect the photosynthetic rates of grapevines cultivated in tropical regions, and thus have strong effects on plant productivity and improve fruit quality. However, in the North of Rio de Janeiro region there are lacks of studies related to TPC effects on photosynthetic capacity. The objective of this study was to evaluate the photosynthetic capacity in 'Niagara Rosada' vines grown under TPC and without transparent plastic covering (WTPC). The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Photosynthesis; Chlorophyll fluorescence; Vitisla brusca; Covered system. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782016000600950 |
| |
|
|
| Villalobo,Ariel; González,Justo; Santos,Ramón; Rodríguez,Romelio. |
| Pineapple producing countries lack good quality propagation material to expand cultivars into new areas. Previously, research protocols may increase the offer of high quality plantlets and speed the introduction of new pineapple cultivars. The present work is to evaluate the morpho-physiological changes in plantlets of pineapple [Ananas comosus (L.) Merr. 'MD-2'] during the acclimatization phase. Plantlets were acclimatized under 80% relative humidity, 25.5 °C temperature and photosynthetic photon flux of 400-500 µmol m-2 s-1 as average for 45 d under natural photoperiods. All measurements (plant length, number of leaves and roots, fresh weight, width and length of leaf 'D', net photosynthesis and total transpiration rate) were carried out at the end of in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chlorophyll; Ex vitro conditions; Photosynthesis; Transpiration. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000600004 |
| |
|
|
| Almeida,Gabriel Martins; Silva,Adinan Alves da; Batista,Priscila Ferreira; Moura,Luciana Minervina de Freitas; Vital,Roberto Gomes; Costa,Alan Carlos. |
| ABSTRACT Drought is the most harmful environmental factor crop productivity. Some chemicals are used in agriculture to mitigate the damage from this stress on plants. Therefore, we examined whether the spraying of zinc sulfate (ZS), potassium phosphite (KPhi) and the hydrogen sulfide (H2S) donor sodium hydrosulfide (NaHS) would mitigate the deleterious effects of water deficit on sunflower plants by analyzing physiological and biometric characteristics. The experiment was carried out in a greenhouse using a randomized block design with five replications. The treatments were arranged in a 4 x 2 factorial scheme: [Factor A (Alleviators)] - spraying of KPhi (0.5 L ha-1), ZS (3.2 kg ha-1), NaHS (1.2 g ha-1), and water; [Factor B (substrate humidity, SH)] -... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Photosynthesis; Water deficit; Malonaldehyde; Leaf water potential; Mitigating substance. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542020000100225 |
| |
|
|
| Silveira,Helbert Rezende de Oliveira; Souza,Kamila Rezende Dázio de; Alves,Jose Donizeti; Santos,Meline de Oliveira; Andrade,Cínthia Aparecida; Bomfim,Sandro Costa. |
| Irrigation has enhanced coffee production in several regions of Brazil. However, with the increase in irrigated crop areas, problems related to the frequent and poorly planned usage of irrigation may arise. Since there are few studies related to the physiological alterations in coffee plants exposed to water excess, we evaluated the effects of waterlogging on metabolism and partitioning of carbohydrates, levels of photosynthetic pigments and gas exchange in seedlings of two commercial coffee cultivars (Mundo Novo and Catuaí). After acclimation, seedlings with eight pairs of fully expanded leaves were cultivated under three water availability conditions: field capacity, intermittent waterlogging and continuous waterlogging. Gas exchange and the levels of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water excess; Photosynthesis; Reducing sugars; Stomatal conductance; Water efficiency use.. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542015000200138 |
| |
|
|
| Miguel,Aurélio Antas; Oliveira,Luiz Edson Mota de; Cairo,Paulo Araquém Ramos; Oliveira,Davi Melo de. |
| This work proposed to investigate changes in the photosynthetic behavior during the leaf ontogeny of the during the leaf development. Up to the 32nd day of leaf age (stage B2), the net photosynthesis was negative due to the inefficiency of the photosynthetic system, and this fact was justified by the following factors: low chlorophyll content, less stomatal conductance, high rubber tree clones PB 235, RRIM 600 and GT 1, in Lavras, MG. The experiment was performed in 2004, between May and July, under field conditions, at the Universidade Federal de Lavras. During the leaf ontogeny, the following characteristics were evaluated: chlorophyll content, gaseous exchanges and chlorophyll fluorescence. The clones presented similar profiles of alterations in the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rubber tree; Photosynthesis; Gaseous exchanges; Chlorophyll fluorescence. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542007000100014 |
| |
| Registros recuperados: 220 | |
|
|
|
