|
|
|
| Registros recuperados: 220 | |
|
|
| Vargas,L.; Silva,D.R.O.; Agostinetto,D.; Matallo,M.B.; Santos,F.M.; Almeida,S.D.B.; Chavarria,G.; Silva,D.F.P.. |
| The objective of this study was to determine changes in gas exchange and inhibition of EPSPs, based on the accumulation of shikimic acid in horseweed biotypes resistant and sensitive to glyphosate. Two experiments were conducted in a factorial model. The first one evaluated horseweed biotypes (one resistant and one susceptible to glyphosate), and herbicide rates (0 and 1,080 g a.e. ha ¹) applied on the weed. In the second experiment, the horseweed biotypes (susceptible and resistant to glyphosate) were evaluated in five periods as following: 0, 3, 7, 10, and 14 days after herbicide application (DAH). The photosynthetic rate, transpiration, carboxylation efficiency, and water efficiency were determined using an infrared gas analyzer (IRGA), and shikimic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hairy fleabane; Resistance; Photosynthesis; EPSPs; Shikimic acid. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000100017 |
| |
|
|
| SANTOS,S.A.; TUFFI-SANTOS,L.D.; ALFENAS,A.C.; FARIA,A.T.; SANT’ANNA-SANTOS,B.F.. |
| ABSTRACT: Drift of the herbicides carfentrazone-ethyl and glyphosate may affect the initial growth of eucalyptus. This study aimed to assess the effect of carfentrazone-ethyl and glyphosate drift on photosynthesis, leaf morphoanatomy, and initial growth of two clones of Eucalyptus grandis. Two experiments were carried out in a 2 x 4 factorial scheme, in which factor 1 was represented by two clones of E. grandis and factor 2 by four herbicide underdoses (control, 86.4 g a.e. ha-1 of glyphosate, 3.0 g a.e. ha-1 of carfentrazone-ethyl, and the mixture of 86.4 g a.e. ha-1 of glyphosate + 3.0 g a.e. ha-1 of carfentrazone-ethyl). Herbicide application was carried out by simulating the drift in the lower third of seedling canopy. Assessments were performed 23... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Eucalyptus; Photosynthesis; Leaf morphoanatomy; Phytointoxication. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100223 |
| |
|
|
| PICOLI JR,G.J.; CARBONARI,C.A.; MATOS,A.K.A.; RODRIGUES,L.F.O.S.; VELINI,E.D.. |
| ABSTRACT In Brazil, ryegrass (Lolium multiflorum) has been identified as resistant to glyphosate, becoming a major problem, especially in crops cultivated in the winter season. This herbicide can indirectly affect photosynthesis by inhibiting biosynthesis of many compounds. Thus, the aim of this study was to investigate the influence of glyphosate on the physiological profile of susceptible and resistant ryegrass populations to the herbicide. The experimental design was completely randomized with two treatments (720 and 1,080 g e.a. ha-1) and four replications plus control with no treatment. Two ryegrass populations were sown, one susceptible and another one resistant to glyphosate. After the treatments, evaluations were carried out at 1, 3, 7 and 28 days... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Herbicide resistance; Photosynthesis; Lolium multiflorum. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100253 |
| |
|
| |
|
|
| MORAES,REGINA MARIA DE; DELITTI,WELINGTON BRAZ CARVALHO; MORAES,JOSÉ ANTÔNIO PROENÇA VIEIRA DE. |
| Indivíduos jovens de Tibouchina pulchra, cultivados em condições padronizadas, foram colocados em três regiões de Cubatão para estudo dos possíveis efeitos dos poluentes aéreos sobre a fotossíntese, o crescimento e as concentrações foliares de ácido ascórbico, clorofila, nitrogênio, enxofre e flúor. As áreas de estudo foram: vale do rio Pilões (RP), considerada área de referência; Caminho do Mar (CM), próxima a indústrias petroquímicas e vale do rio Mogi (VM), próxima a indústrias siderúrgicas e de fertilizantes. Quatro plantas permaneceram em cada área por um período de seis meses. Em comparação com as plantas mantidas na área de referência (RP - 9,81 mimol.m-2.s-1), a fotossíntese líquida foi reduzida (p < 0,05) nas plantas que foram mantidas em VM... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Air pollution; Tibouchina pulchra; Cubatão; Photosynthesis. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042000000400010 |
| |
|
| |
|
|
| LEMOS FILHO,JOSÉ PIRES DE. |
| O objetivo deste estudo foi verificar a performance fotossintética e a ocorrência de fotoinibição em três espécies do cerrado, na estação seca e estação chuvosa. Os valores do rendimento quântico potencial do fotossistema II (Fv/Fm) após 1 hora de adaptação ao escuro, ao meio dia, foram inferiores a 0,8 para todas as espécies nas duas estações, caracterizando a presença da fotoinibição. Na estação seca, apesar das reduções observadas na condutância estomática, no rendimento quântico efetivo(DF/F`m) e na taxa aparente de transporte de elétrons (ETR), a saturação da fotossíntese foi similar à observada na estação chuvosa, para todas as espécies estudadas, aproximadamente 1500 mmol.m-2.s-1. Nesse nível de luz, o excesso relativo do fluxo de fótons de... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Photosynthesis; Photoinhibition; "cerrado" plants. |
| Ano: 2000 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042000000100005 |
| |
|
|
| Cavalcante,Antônio R.; Santos Júnior,José A.; Furtado,Guilherme de F.; Chaves,Lúcia H. G.. |
| ABSTRACT Gas exchanges and chlorophyll a fluorescence are ways to physiologically analyze the response of plants to salt stress. In this context, the present work was conducted between August and November 2016 in a greenhouse at the Federal University of Campina Grande (7°12’52” S, 35°54’24” W, mean altitude of 550 m), using bell pepper plants cv. All Big, exposed to levels of nutrient solution electrical conductivity (1.7, 3.7, 5.7, 7.7, 9.7 and 11.7 dS m-1) and cultivated in hydroponic system, spaced by 0.2 and 0.3 m, focusing on the analysis of gas exchanges and photochemical efficiency. The experimental design was completely randomized, in a 6 x 2 factorial scheme, with five replicates. Plant density influenced the sensitivity of the gas exchanges to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Capsicum annuum L.; Low-cost hydroponics; Photosynthesis. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000100003 |
| |
|
|
| Lima,Breno L. de C.; Silva,Ênio F. de F. e; Santos,Hugo R. B.; Souza,Edivan R. de. |
| ABSTRACT The use of treated domestic wastewater in agriculture is promising because it contains essential nutrients for crops, especially for cotton plants. Information on leaf gas exchanges helps to understand the responses of plants to different water and nutrient managements, since they directly affect physiological processes. Thus, the objective of this study was to evaluate the effect of potassium fertilization and irrigation with treated wastewater on the gas exchange of naturally colored cotton plants grown in the semi-arid region of the state of Pernambuco, Brazil, providing a reference for evaluations of responses of cotton plants to abiotic factors. The experiment was conducted in a randomized block design, in a 5 × 5 factorial arrangement, with... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gossypium hirsutum L.; Photosynthesis; Stomatal conductance. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018001100741 |
| |
|
|
| Dutra,Wellison F.; Melo,Alberto S. de; Dutra,Alexson F.; Brito,Marcos E. B.; Filgueiras,Luanna M. B.; Meneses,Carlos H. S. G.. |
| ABSTRACT To evaluate the photosynthetic efficiency, gas exchange and yield of castor bean intercropped with peanut under Brazilian semiarid conditions, a field experiment was set up with six treatments and four replicates arranged in a randomized block design. The experiment consisted of the cultivation of castor bean ‘BRS Energia’ in a monocrop system and intercropped with peanut ‘BR 1’. One treatment was formed by monocropped castor bean and the others by the castor bean intercropped with peanut with different intercrop establishment times, i.e. peanut sowing times (0, 10, 15, 20 and 25 days after castor bean sowing). The castor bean photosynthetic and carboxylation efficiencies were higher in the intercrop system with a 25-day interval between sowings.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chlorophyll fluorescence; Photosynthesis; Ricinus communis L.; Yield. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000200106 |
| |
|
|
| Melo,Hidelblandi F. de; Souza,Edivan R. de; Duarte,Heitor H. F.; Cunha,Jailson C.; Santos,Hugo R. B.. |
| ABSTRACT The tools that evaluate the salinity effects on plants have great relevance as they contribute to understanding of the mechanisms of tolerance. This study aimed to evaluate gas exchanges and the contents of photosynthetic pigments in bell peppers cultivated with saline solutions (0, 1, 3, 5, 7 and 9 dS m-1) prepared using two sources: NaCl and a mixture of Ca, Mg, K, Na and Cl salts, in randomized blocks with a 6 x 2 factorial scheme and 4 replicates, totaling 48 experimental plots. The net photosynthesis (A), stomatal conductance (gs), transpiration (E), internal CO2 concentration (Ci), instantaneous carboxylation efficiency (A/Ci) and water use efficiency (WUE), besides chlorophyll a, b and carotenoids were evaluated. The gas exchange parameters... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Salt stress; Photosynthesis; Chlorophyll; Brazilian semi-arid region. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000100038 |
| |
|
|
| Lima,Alan D.; Sousa,Carlos H. C.; Lacerda,Claudivan F. de; Bezerra,Marlos A.; Silva,Evandro N.; Neves,Antônia L. R.. |
| ABSTRACT The objective of this study was to evaluate gas exchanges in seedlings of forest species grown in saline soils and subjected to soil waterlogging cycles. The experimental design was completely randomized in a factorial arrangement, with four forest species: Myracrodruon urundeuva Fr Allemão, Mimosa caesalpiniifolia Benth, Tabebuia impetiginosa (Mart. ex. DC.) Standl and Azadirachta indica A. Juss, two soil salinity levels (1.2 and 8.6 dS m-1) and two water regimes (with and without waterlogging). Measurements of stomatal conductance, transpiration and CO2 assimilation rate were performed before and after each waterlogging period. The interaction of the highest saline level (8.6 dS m-1) and waterlogging caused greater reductions in leaf gas... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Photosynthesis; Salt stress; Water excess; Caatinga. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017001000670 |
| |
|
|
| Coelho,Daniela S.; Simões,Welson L.; Salviano,Alessandra M.; Mesquita,Alessandro C.; Alberto,Keila da C.. |
| ABSTRACT Adaptation of plants to saline environments depends on the activation of mechanisms that minimize the effects of excess ions on vital processes, such as photosynthesis. The objective of this study was to evaluate the leaf gas exchange, chlorophyll, and organic solute in ten genotypes of forage sorghum irrigated with solutions of different salinity levels. The experiment was conducted in a randomized block design, in a 10 x 6 factorial arrangement, with three replications, using ten genotypes - F305, BRS-655, BRS-610, Volumax, 1.015.045, 1.016.005, 1.016.009, 1.016.013, 1.016.015 and 1.016.031 - and six saline solutions, with electrical conductivity (ECw) of 0, 2.5, 5.0, 7.5, 10 and 12.5 dS m-1. The photosynthetic activity in forage sorghum plants... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Salt stress; Photosynthesis; Chlorophyll; Sorghum bicolor (L.) Moench. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000400231 |
| |
|
|
| Borges,Francisca R. M.; Viana,Thales V. de A.; Marinho,Albanise B.; Pinheiro Neto,Luis G.; Azevedo,Benito M. de. |
| ABSTRACT The objective of this study was to evaluate the effect of energized water and bovine biofertilizer doses on the gas exchange and NPK contents in leaves of yellow bell pepper plants. The experiment was conducted at the experimental area of the Federal University of Ceará, in Fortaleza-CE, Brazil, from June to November 2011. The experiment was set in a randomized block design, in a split-plot scheme; the plots were composed of treatments with energized and non-energized water and the subplots of five doses of liquid biofertilizer (0, 250, 500, 750 and 1000 mL plant-1 week-1). The following variables were analyzed: transpiration, stomatal conductance, photosynthesis and leaf contents of nitrogen (N), phosphorus (P) and potassium (K). Water... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Capsicum annuum L.; Organic fertilization; Photosynthesis. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000600533 |
| |
|
|
| Pereira Filho,João V.; Viana,Thales V. de A.; Sousa,Geocleber G. de; Chagas,Keivia L.; Azevedo,Benito M. de; Pereira,Carmem C. M. de S.. |
| ABSTRACT Under water deficit and/or salt stress conditions, crops suffer from several physiological disturbances, which lead to the reduction in growth and, consequently, decreases in their yields. Thus, the objective of this study was to evaluate the physiological responses of lima bean, cultivar Espírito Santo, under different irrigation water salinity associated to two water regimes. The experiment was carried out in the experimental area of the Universidade Federal do Ceará, Brazil, from September to November 2017, and it was carried out in pots in full sun, under a completely randomized design in split plots, where water salinities (1.1, 2.1, 3.1, 4.1 and 5.1 dS m-1) were considered as the plots, and the treatments of water regime (50 and 100% of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phaseolus lunatus L.; Photosynthesis; Water quality; Water deficit. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019001200959 |
| |
|
|
| Silva,Evandro M. da; Lima,Geovani S. de; Gheyi,Hans R.; Nobre,Reginaldo G.; Sá,Francisco V. da S.; Souza,Leandro de P.. |
| ABSTRACT Nitrogen (N) fertilization has been tested for the mitigation of salt stress in some species including fruit crops. However, special attention should be paid to the source of N, due to the different compositions and saline indices of the fertilizers, particularly when irrigation is conducted using waters with salinity levels that are restrictive to agriculture. Thus, this study evaluated the effect of fertilization with N sources on the growth and gas exchanges of soursop irrigated with saline water after transplanting. The experiment was carried out in greenhouse at the Center of Technology and Natural Resources of the Federal University of Campina Grande, and treatments were arranged in randomized blocks, in 4 x 4 factorial scheme, corresponding... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Annona muricata L.; Salinity; Nitrogen; Photosynthesis. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018001100776 |
| |
|
|
| Endres,Lauricio; Souza,José L. de; Teodoro,Iedo; Marroquim,Paula M. G.; Santos,Claudiana M. dos; Brito,José E. D. de. |
| The purpose of the present study was to analyze gas exchanges in leaves and the parameters of productivity of beans (Phaseolus vulgaris, L.) submitted to two water deficiency periods during which three water regimes were employed: W1 (1,0 ETo during the entire plant cycle); W2 (1,0 ETo up to the flowering period and irrigation interruption from the 37 to the 51st day following sowing, and W3 (in addition to the reproductive phase, water deficit was also applied during the vegetative stage). Photosynthesis was one of the main physiological factors affected by water deficit. This was not only caused by the stomata closure, but also by carboxilation reduction due to metabolic damage. This effect was, however, offset 24 h after rehydration. During flowering,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Photosynthesis; Transpiration; Phaseolus vulgaris L. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662010000100002 |
| |
|
|
| Melo,Hidelblandi F. de; Souza,Edivan R. de; Cunha,Jailson C.. |
| ABSTRACT Chlorophyll a fluorescence is a very useful tool in ecophysiological studies to analyze the photosynthetic performance of plants under biotic and abiotic stresses. This research aimed to evaluate the parameters of the fluorescence of chlorophyll a, contents of chlorophyll a, b and total, and carotenoids in Atriplex nummularia cultivated under water stress (37 and 70% of field capacity) and salt stress (irrigation water with electrical conductivity of 0, 5, 10, 20, 30 and 40 dS m-1), besides two sources of salts: NaCl and a mixture of salts of Ca2+, Mg+2, K+, Na+ and Cl-, in a 6 x 2 x 2 factorial, with 4 replicates, totaling 96 experimental plots. At 91 days after transplanting, the initial fluorescence (F0), maximum fluorescence (Fm), potential... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Photosynthesis; Water and salt stress; Halophyte. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000400232 |
| |
|
|
| Oliveira,Wanderson J. de; Souza,Edivan R. de; Cunha,Jailson C.; Silva,Ênio F. de F. e; Veloso,Venâncio de L.. |
| ABSTRACT Leaf gas exchanges in plants and soil respiration are important tools for assessing the effects of salinity on the soil-plant system. An experiment was conducted with cowpea irrigated with saline water (0, 2.5, 5.0, 7.5, 10.0 and 12.5 dS m-1) prepared with two sources: NaCl and a mixture of Ca, Mg, Na, K and Cl ions in a randomized block design and a 6 x 2 factorial scheme, with four replicates, totaling 48 experimental plots. At 20 days after planting (DAP), plants were evaluated for net photosynthesis (A), stomatal conductance (gs) and transpiration (E) using the Infra-Red Gas Analyzer (Model XT6400- LICOR), and water use efficiency, intrinsic water use efficiency and instantaneous efficiency of carboxylation were calculated. At 60 DAP, the soil... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Photosynthesis; Salinity; Salt stress; Soil respiration. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000100032 |
| |
|
|
| Sousa,Geocleber G. de; Rodrigues,Valdécio dos S.; Soares,Stallone da C.; Damasceno,Ítalo N.; Fiusa,Jamili N.; Saraiva,Sâmara E. L.. |
| ABSTRACT Salinity is a complex phenomenon that affects the metabolic processes of the plant, changing the physiological and biochemical parameters. In this context, the objective of this study was to evaluate the effect of irrigation water salinity on growth, biomass and gas exchanges in soybean crop in soil with and without biofertilizer. The experiment was carried out in a greenhouse at the experimental area of the Agrometeorological Station of the UFC, Fortaleza, CE, Brazil, from May to June 2016. The treatments were distributed in randomized blocks in a 5 × 2 factorial scheme, corresponding to the levels of irrigation water salinity: 0.8; 1.6; 2.4; 3.2 and 4.0 dS m-1, in soil without and with bovine biofertilizer, in five replicates. The following... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Organic fertilizer; Saline stress; Photosynthesis. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000900604 |
| |
| Registros recuperados: 220 | |
|
|
|
