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Changes in growth and photosynthetic capacity of cucumber seedlings in response to nitrate stress Braz. J. Plant Physiol.
Yang,Xiaoyu; Wang,Xiufeng; Wei,Min; Hikosaka,Shoko; Goto,Eiji.
The effects of three nitrate levels - 14(CK), 56(T-1), and 140 mmol L-1 (T-2) - on growth and photosynthetic capacity of cucumber (Cucumis sativus L. cv. Xintaimici) seedlings grown in hydroponic culture were investigated. The results showed that at 12 d after treatment plant height, stem diameter, leaf area, and leaf number of cucumber seedlings were stimulated by 56 mmol L-1 nitrate, whereas were inhibited significantly by 140 mmol L-1 nitrate compared with CK. Short-term stimulation in photosynthetic rate occurred under T-1 treatment, and then recovered to the level of CK. Photosynthetic rate of T-2 seedlings significantly decreased over treatment course with respect to CK. Photosynthetic pigment content of T-1 and T-2 increased during the first 2 d,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chlorophyll a fluorescence; Hill reaction; Photosynthetic pigment content; Photosynthetic rate.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202009000400007
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Effect of water availability on physiological performance and lettuce crop yield (Lactuca sativa) Ciencia e Investigación Agraria
Molina-Montenegro,Marco A; Zurita-Silva,Andrés; Oses,Rómulo.
Water is essential for plants, affecting the majority of the physiological processes related to growth and productivity. Water shortage is one of the most common factors that limit crop productivity worldwide. Many cultivars have elevated water requirements, nevertheless in some countries due to global climate change effects, the availability of water for irrigation is becoming limited. In fact, current models of climate changes predict that central Chile will be a sensitive zone where precipitation will drastically decrease. In this study, the variation of gas exchange and production of fresh biomass in a lettuce cultivar, grown under different water availability regimes, was evaluated. Additionally, the concentration of total soluble sugar and water use...
Tipo: Journal article Palavras-chave: Soluble sugars; Water use efficiency; Water shortage; Lettuce; Photosynthetic rate.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000100006
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Gas exchange in 'BRS Princesa' banana ( Musa spp.) under partial rootzone drying irrigation in the north of Minas Gerais, Brazil Acta Agron. (Palmira)
Santos,Marcelo Rocha dos; Rodrigues Donato,Sérgio Luiz; Arantes,Alessandro de Magalhães; Coelho,Eugênio Ferreira; Oliveira,Polyanna Mara de.
Abstract This research aimed to evaluate physiological characteristics of 'BRS Princesa' banana under partial rootzone drying irrigation, PRD. The five treatments, 1 - 50% of reduction in water depth (WD) with a frequency alternation of irrigation side (FA) of seven days during the whole production cycle; 2 - 50% of WD and FA of 14 days in the cycle; 3 - 50% of WD and FA of 21 days; 4 - 50% of WD with a fixed irrigation (only one lateral line on one side of the plant); and 5 - full irrigation (two lateral lines with open shutoff valve) throughout the cycle, they were arranged in a randomized block design with five replicates. There is a reduction in photosynthetic rates and water use efficiency as a result of enzymatic impairment or stomatal closure, due...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Abiotic stress; Irrigation techniques; Photosynthetic rate; Stomatal closure; Vegetative growth; Water deficit.
Ano: 2017 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122017000300378
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Gas exchanges, chemical composition and productive characteristics of tropical grasses deferred I: cultivars BRS Massai and BRS Tamani. Repositório Alice
FONTINELE, R. G.; ARAÚJO, R. A. de; CÂNDIDO, M. J. D.; ROGERIO, M. C. P.; COSTA, C. dos S.; SOUZA, H. A. de; FURTADO, R. N.; POMPEU, R. C. F. F..
Abstract: This study aimed to evaluate the physiological parameters, the productive characteristics, structural and chemical composition of Megathyrsus maximus (syn. Panicum maximum) cultivars BRS Massai and BRS Tamani submitted to different periods of deferment and moments of use. The experimental design was randomized complete block design in a factorial scheme 2 x 2 x 3, being two grass cultivars (Massai grass and Tamani grass), two deferment periods (rainy season and dry-rainy transition) and three sealing times (40, 80 and 120 days). Both cultivars had higher leaf transpiration rate when used for 40 days of deferment (0.63 &#956;mol/m2/s). It was observed that the cultivar BRS Massai presented higher photosynthetic rate (P<0.05) to 40 days of...
Tipo: Artigo de periódico Palavras-chave: Acúmulo de forragem; Índice de tombamento; Capim-massai; Capim Massai; Capim-tamani; Capim tamani; Taxa fotossintética; Photosynthetic rate; Falling index; Forage accumulation; Gramínea Forrageira; Leguminosa Forrageira; Panicum Maximum; Forage grasses; Megathyrsus maximus.
Ano: 2022 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1143238
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Levels of shading and application of glyphosate and carfentrazone-ethyl in the control of Macroptilium atropurpureum AGRIAMBI
Costa,Gustavo A.; Santos,Leonardo D. T.; Ferreira,Guilherme A. de P.; Cruz,Leandro R. da; Machado,Vitor D.; Rocha,Leonardo M..
ABSTRACT Variations in environmental conditions, such as the availability of light, can affect the efficacy of herbicides because they alter the biological characteristics of plants including those that are related to the plant’s sensitivity to herbicides. Therefore, the objective of the present study was to assess the influence of environments with different light availabilities, and of the application of glyphosate and carfentrazone-ethyl (separately or in combination) on the morphophysiology and control of Macroptilium atropurpureum. An experimental design of randomized blocks with five replicates was used, with treatments arranged in a split-plot design. The plots were composed of three levels of shading (full sunlight, 50% shading, and 70% shading);...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Physiology; Siratro; Photosynthetic rate; Leaf area.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018001200819
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Morpho-anatomical and physiological alterations of passion fruit fertilized with silicone PAB
Costa,Bárbara Nogueira Souza; Costa,Irton de Jesus Silva; Dias,Gabrielen de Maria Gomes; Assis,Franscinely Aparecida de; Pio,Leila Aparecida Salles; Soares,Joyce Dória Rodrigues; Pasqual,Moacir.
Abstract: The objective of this work was to evaluate the effect of silicon fertilization on gas exchange, leaf anatomy, and ultrastructural characteristics of passion fruit (Passiflora edulis). The treatments comprised four concentrations of silicon (0, 0.28, 0.55, and 0.83 g per pot) at 1% silicic acid solution (SiO2.XH2O). This solution was applied around the stems of the plants. The first application was made 15 days after seedlings were transplanted. In total, three applications were made at 15-day intervals. The pots that constituted the control treatment received water in the same amount. After the final application, the plants were subjected to analyses of gas exchange, anatomical changes, and ultrastructural characteristics. The use of silicon...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Passiflora edulis; Photosynthetic rate; Silicic acid; Ultrastructural features.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000200163
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Photosynthetic activity of coffee after application of glyphosate subdoses - doi: 10.4025/actasciagron.v35i1.15440 Agronomy
Carvalho, Felipe Paolinelli de; Universidade Federal de Viçosa; França, André Cabral; Universidade Federal dos Vales do Jequitinhonha e Mucuri; Lemos, Vinícius Teixeira; Universidade Federal de Lavras; Ferreira, Evander Alves; Universidade Federal dos Vales do Jequitinhonha e Mucuri; Santos, José Barbosa dos; Universidade Federal dos Vales do Jequitinhonha e Mucuri; Silva, Antonio Alberto da; Universidade Federal de Viçosa.
Farmers use non-selective herbicides, such as glyphosate, in directed applications to control weeds in coffee crops. Despite the precautions used during the application of herbicides, there are usually reports of poisoning in plantation areas. Moreover, it is fundamental to understand the effects of glyphosate on photosynthetic processes. The present study aimed to evaluate the characteristics associated with the photosynthetic activity in coffee cultivars subjected to doses of glyphosate. The experiment was conducted in a greenhouse using three varieties of coffee (Coffea arabica), including Acaiá (MG-6851), Catucaí Amarelo (2 SL) and Topázio (MG-1190), and three subdoses of glyphosate (0.0, 115.2 and 460.8 g ha-1) in a 3 x 3 factorial scheme. Herbicide...
Tipo: Pesquisa empírica Palavras-chave: 5.01.03.00-8 herbicide; EPSPs; Coffea arabica; Photosynthetic rate; Drift Fitotecnia herbicide; EPSPs; Coffea arabica; Photosynthetic rate; Drift.
Ano: 2012 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/15440
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Photosynthetic rate of the aquatic macrophyte Egeria densa Planch. (Hydrocharitaceae) in two rivers from the Itanhaém River Basin in São Paulo State, Brazil BABT
Pezzato,Maura Maria; Camargo,Antonio Fernando Monteiro.
Egeria densa is a submerged aquatic macrophyte which, in Brazil, causes problems specially for electric energy generation. The purpose of this study was to evaluate the photosynthetic rate of E. densa in two rivers (Aguapeú and Mambu) with different limnological features, both located in the Itanhaém River Basin. This species is abundant in both rivers without causing damages to their multiple uses. Photosynthetic rates were analysed in February, May, August and November 1998 and limnological variables of the water and sediment were also measured. The highest value of gross photosynthesis (GP) was detected in May (10.06 in Aguapeú and 6.10 mgO2/gDW/h in Mambu), when under-water photosynthetic active radiation (PAR) was also high (1,126.7 and 895.8 m...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aquatic macrophyte; Egeria densa; Photosynthetic rate; Brazil.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132004000100021
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Physiological Response of Maize and Weeds in Coexistence Planta Daninha
BARROS,R.E.; FARIA,R.M.; TUFFI SANTOS,L.D.; AZEVEDO,A.M.; GOVERNICI,J.L..
ABSTRACT This study aimed at evaluating the physiology of maize and weeds when living under different densities. The randomized block design with 4 replications was used. The factorial scheme 5 x 2 + 1 and 5 x 3 was adopted, for maize and weeds respectively, corresponding to weed species (Bidens pilosa, Commelina benghalensis, Urochloa brizantha, Sorghum arundinaceum and Ipomoea triloba) and infestation density (control, 15 and 30 plants m-2). Weeds were kept in coexistence with the maize hybrid DKB 390 PRO 2, with an additional treatment for maize plants absent of competition. It was kept in coexistence with maize hybrid DKB 390 PRO 2 besides an additional treatment with maize plants absent of competition. On day 45 and 60 after maize planting (DAP)...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Zea mays; Urochloa brizantha; Sorghum arundinaceum; Photosynthetic rate; Transpiration; Competition.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582017000100223
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Response of a clingstone peach cultivar to regulated deficit irrigation Scientia Agricola
Sotiropoulos,Thomas; Kalfountzos,Dimitrios; Aleksiou,Ioannis; Kotsopoulos,Spyros; Koutinas,Nikolaos.
Regulated deficit irrigation (RDI) involves inducing water stress during specific fruit growth phases by irrigating at less than full evapotranspiration. The objectives of this research were to study the effects of RDI perfomed at stage II of fruit growth and postharvest, on productivity of clingstone peaches, fruit quality as well as photosynthetic rate and midday leaf water potential. The research was conducted in a commercial clingstone peach (Prunus persica L. Batch cv. A-37) orchard in Greece. Trees were irrigated by means of microsprinklers and their frequency was determined using local meteorological station data and the FAO 56 Pennman-Monteith method. Photosynthetic rate was measured by a portable infrared gas analyzer. Midday leaf water potential...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fruit drop; Leaf water potential; Photosynthetic rate; Water savings.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000200006
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Seasonal variation in gas exchange by plants of Erythroxylum simonis Plowman Acta Botanica
Ribeiro,João Everthon da Silva; Barbosa,Ana Jéssica Soares; Lopes,Sérgio de Faria; Pereira,Walter Esfrain; Albuquerque,Manoel Bandeira de.
ABSTRACT Erythroxylum simonisis an understory species found in Northeast Brazil. Due to its shaded habitat,E. simonisis subjected to seasonal oscillations of the environment, to which it must respond ecophysiologically. The objective of this study was to evaluate the effects of seasonality on the ecophysiology ofE. simonis in a fragment of Seasonal Semideciduous Forest. Leaf area index, visible sky fraction and photosynthetically active radiation were measured for 10 individuals during the dry and rainy seasons. Soil moisture, temperature and monthly precipitation were measured, as well as photosynthetic rate, stomatal conductance, internal CO2concentration, transpiration, instantaneous water use efficiency, instantaneous carboxylation efficiency and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Responses; Photosynthetic rate; Seasonal changes; Seasonal Semideciduous Forest; Understory.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062018000200287
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