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Absorção e redução de nitrato em duas cultivares de arroz na presença de alumínio. Repositório Alice
JUSTINO, G.C.; CAMBRAIA, J.; OLIVA, M.A.; OLIVEIRA, J.A. de.
O objetivo deste trabalho foi estudar os efeitos do alumínio (Al) sobre a absorção e a redução de nitrato, em duas cultivares de arroz: Fernandes (tolerante) e Maravilha (sensível), expostas a 0 e 500 µM de Al. Depois de 21 dias de crescimento, foram determinados o comprimento, a produção de matéria seca, os teores de Al e de nitrato e a atividade in vitro da redutase do nitrato (RN), nas raízes e na parte aérea, bem como as constantes cinéticas de absorção de nitrato pelas raízes. O Al reduziu o crescimento em comprimento e a produção de matéria seca, nas duas partes das plantas, apenas da cultivar Maravilha. Os teores de Al aumentaram nas raízes e parte aérea das plantas nas duas cultivares, enquanto o teor de nitrato sofreu redução apenas nas raízes da...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Oryza sativa; Nitrogênio; Redutase do nitrato; Tolerância ao Al; Nitrogen; Nitrate reductase; Al tolerance.
Ano: 2006 URL: http://www.alice.cnptia.embrapa.br/handle/doc/119185
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Activation of nitrate reductase of cashew leaf by exogenous nitrite Braz. J. Plant Physiol.
Viégas,Ricardo Almeida; Silveira,Joaquim Albenísio Gomes.
Nitrate reductase (NR) plays a central role in plant primary metabolism and exhibits complex regulation mechanisms for its catalytic activity. There is controversy in the literature concerning the possible direct effect of NO2- on the stimulation and/or activation of NR activity. The influence of NO2- was studied on the NR activity in the leaves of 30-day-old cashew (Anacardium occidentale L.) seedlings. Addition of NO2- to the reaction mixture containing leaf enzymatic extract resulted in a remarkable increase in NR activity. A trace amount (5 mumol.L-1) of NO2- was required to achieve full NR activity. The in vitro NR-activity showed a steady time-dependent increase when incubated in the presence of only NO3- + NO2-. In contrast, in vitro NR activity was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Anacardium occidentale; Enzymes; NADH; Nitrate metabolism; Nitrate reductase.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202002000100005
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Agronomic studies of corn and sorghum during 1977 Thai Agricultural
Supot Faungfupong; Wasana Wongyai; Kittima Montranon; Surapol Chowchong.
12 tables
Palavras-chave: Corn; Maize; Sorghum; Growth; Nitrate reductase; Agronomic characters; Dry weight; Nitrogen fertilizers; Weed control; Yields; ข้าวโพด; ข้าวฟ่าง; การเจริญเติบโต; การแข่งขันกับวัชพืช.
Ano: 1977 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/3921
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Anatomic and physiological modifications in seedlings of Coffea arabica cultivar Siriema under drought conditions Ciência e Agrotecnologia
Melo,Emanuelle Ferreira; Fernandes-Brum,Christiane Noronha; Pereira,Fabrício José; Castro,Evaristo Mauro de; Chalfun-Júnior,Antonio.
Due to the weather changes prognostic for the coming years, the understanding of water deficit and physiological responses of plants to drought becomes an important requirement in order to develop technologies such as mechanisms to assist plants to cope with longer drought periods, which will be essential to maintenance of Brazilian and worldwide production. This study aimed to evaluate ecophysiological and anatomical aspects as well as the nitrate reductase activity in Siriema coffee seedlings subjected to four treatments: Daily irrigated, non-irrigated, re-irrigated 24 hours and re-irrigated 48 hours after different stress periods. Non-irrigation promoted a reduction in leaf water potential being accented from the ninth day of evaluation onwards....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coffee tree; Ecophysiology; Water stress; Nitrate reductase.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542014000100003
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Aspects of nitrogen metabolism in coffee plants Braz. J. Plant Physiol.
Carelli,Maria Luiza Carvalho; Fahl,Joel Irineu; Ramalho,José D. Cochicho.
Coffee plants are highly N-demanding plants. Despite the importance of N nutrition for the development, acclimation and yield of coffee plants, there are few reports concerning N metabolism in this species. In this review, our intention is to summarize the information available in the literature and to point out the influence of environmental conditions on N assimilation, as well as comment and discuss some apparently contradictory results and raise and enlighten queries about N assimilation in coffee plants.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coffea; Irradiance level; Nitrate reductase; Nitrogen fertilization; Oxidative stress; Photoinhbition; Photoprotection; Photosynthesis.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202006000100002
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Atividade enzimática em variedades de cana-de-açúcar cultivadas in vitro sob diferentes níveis de nitrogênio. Repositório Alice
DONATO, V.M.T.S.; ANDRADE, A.G. de; SOUZA, E.S. de; FRANÇA, J.G.E.; MACIEL, G.A..
O nitrogênio é considerado o elemento mineral mais abundante nas plantas, sendo componente essencial de biomoléculas e inúmeras enzimas. O objetivo deste trabalho foi avaliar a eficiência no processo de assimilação do nitrogênio e encontrar parâmetros indicativos do potencial de fixação biológica em variedades de cana-de-açúcar (Saccharum officinarum) cultivadas in vitro. Foram utilizadas as variedades de cana-de-açúcar RB 842021, RB 83102, RB 75126, RB 882980 e Co 997, além da Brachiaria arrecta (testemunha), cultivadas in vitro em diferentes níveis de nitrogênio [M1 (9,83 mM), M2 (2,46 mM), M3 (0,49 mM), M4 (0,0 mM)]. Todas as variedades e a cultura testemunha (Brachiaria arrecta) apresentaram atividade da nitrato redutase (NR) constitutiva e também da...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Saccharum; Glutamina sintetase; Redutase do nitrato; Clorofila; Nitrate reductase; Chlorophyll.
Ano: 2004 URL: http://www.alice.cnptia.embrapa.br/handle/doc/113112
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Changes in nitrate reductase activity and oxidative stress response in the moss Polytrichum commune subjected to chromium, copper and zinc phytotoxicity Braz. J. Plant Physiol.
Panda,Sanjib Kumar; Choudhury,Shuvasish.
The main aim of this paper was to investigate the effect of chromium (Cr), copper (Cu) and zinc (Zn) on nitrate reductase (NR) activity and oxidative stress responses in the moss Polytrichum commune. Cr, Cu and Zn resulted in the inhibition of NR activity. A decline in total chlorophyll content was observed after 24 and 48 h of metal treatment. Accumulation of the metals showed a dose and time dependent increase. High accumulation of Cu, Cr and Zn were seen in moss shoots after 24 and 48 h of treatment. Treatment of Cr, Cu and Zn for 24 or 48 h resulted in the increase of malondialdehyde (MDA) content in moss shoots. The highest increase was observed in shoots under Cu treatment followed by Cr and Zn. The MDA content was significantly higher after 48h....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antioxidants; Chromium; Copper; Malondialdehyde; Nitrate reductase; Oxidative stress; Polytrichum commune; Zinc.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202005000200001
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Characterization of nitrate reductase activity in vitro in Gracilaria caudata J. Agardh (Rhodophyta, Gracilariales) Rev. Bras. Bot.
Chow,Fungyi; Capociama,Fernanda V.; Faria,Renata; Oliveira,Mariana C. de.
The marine red alga Gracilaria caudata J. Agardh has been used in Brazil for agar extraction, mainly in the northeast region of the country. Nitrogen availability is the most important abiotic factor in seawater that limits the growth of seaweeds. The enzyme nitrate reductase (NR) is the key regulatory point in the nitrogen assimilation in photosynthetic organisms. This study describes an in vitro assay, characterizing the enzymatic activity of NR in terms of kinetic constants and stability, its oscillation during the day and glucose effect on NR modulation. Maximal peaks of NR activity were recorded at 20 ºC and pH 8.0. The enzymatic stability in crude extracts stored at 3 ± 1 ºC decreased significantly after 48 hours. Apparent Michaelis-Menten constants...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agarophyte; Gracilaria caudata; Nitrate reductase; Nitrogen metabolism.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042007000100012
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Cultural practice studies in corn and sorghum during 1976 Thai Agricultural
Supot Faungfupong; Wasana Wongyai; Kittima Montranon; Surapol Chowchong.
17 tables
Palavras-chave: Corn; Maize; Sorghum; Variety trials; Direction of planting; Nitrogen fertilizers; Nitrate reductase; Plant population; Tannin; Yields; ข้าวโพด; ข้าวฟ่าง; ประชากรพืช; แทนนิน; ปริมาณ; เอนไซม์; ไนเตรตรีดัคเตส; ทิศทางการปลูก; การเพาะปลูก.
Ano: 1976 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/3853
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Development of a transformation system for Penicillium brevicompactum based on the Fusarium oxysporum nitrate reductase gene BJM
Varavallo,Maurílio Antônio; Queiroz,Marisa Vieira de; Pereira,Jorge Fernando; Ribeiro,Ronney Adriano; Soares,Marcos Antônio; Ribeiro,João Batista; Araújo,Elza Fernandes de.
Penicillium brevicompactum is a filamentous fungus that presents a potential for industrial use due its efficient pectinase production. A heterologous transformation system was developed for P. brevicompactum based on the complementation of a nitrate reductase mutant. Nitrate reductase mutants were obtained by resistance to chlorate in a rate of 23.24% when compared to other mutations that lead to the chlorate resistance. One mutant named 4457-18X was chosen for the transformation experiments with the pNH24 vector containing de Fusarium oxysporum nitrate reductase gene. A frequency of approximately 3 transformants/µg DNA was obtained using the circular vector pNH24. This frequency was multiplied about 10 fold using the linearized vector with the Xba I...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Nitrate reductase; Penicillium brevicompactum; Heterologous transformation.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822005000200015
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DROUGHT-INDUCED EFFECTS AND RECOVERY OF NITRATE ASSIMILATION AND NODULE ACTIVITY IN COWPEA PLANTS INOCULATED WITH BRADYRHIZOBIUM SPP. UNDER MODERATE NITRATE LEVEL BJM
Silveira,Joaquim Albenísio Gomes da; Costa,Roberto Cezar Lobo da; Oliveira,José Tadeu Abreu.
This study was carried out to establish comparative effects of drought and recovery on the nitrate assimilation and nodule activity related to N2 fixation in cowpea plants [Vigna unguiculata L. (Walp.)] previously inoculated with Bradyrhizobium spp. BR-3256 (CB-756) strain in the presence of 5 mol m-3 NO-3. Twenty-eight-day-old nodulated plants were submitted to water deprivation during 4 consecutive days and afterwards resupplied with nutrient solution during 2 days. The water deprivation caused a rapid increase in the nitrate content in root and a marked reduction in leaf nitrate reductase (NR) activity. In contrast nodule NR activity was slightly increased by water deprivation. Concomitantly, in nodules of water stressed plants, leghemoglobin and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Glutamine synthetase; Leghemoglobin; Nitrate reductase; N2 fixation; Water stress; Vigna unguiculata (L.) Walp.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822001000300005
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Efeito da adubação nitrogenada e da inoculação com bactérias diazotróficas no comportamento bioquímico da cultivar de milho nitroflint. Repositório Alice
MACHADO, A. T.; SODEK, L.; DOBEREINER, J.; REIS, V. M..
Com o objetivo de verificar o efeito da adubação nitrogenada e da inoculação de bactérias diazotróficas no comportamento genético e bioquímico da cultivar de milho (Zea mays L.) Nitroflint, foram realizados dois experimentos: o primeiro no campo e o segundo em casa de vegetação. O delineamento experimental foi de blocos ao acaso com três repetições e dois fatores de avaliação: inoculação de bactérias diazotróficas (com e sem) e adubação nitrogenada (100 kg/ha de N e 10 kg/ha de N). No primeiro experimento, os caracteres avaliados foram: produção de grãos, nitrogênio total acumulado na planta (parte aérea) e no grão, atividade das enzimas nitrato redutase e glutamina sintetase. No segundo, avaliou-se peso da planta (peso fresco) e a atividade das enzimas...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Nitrate reductase; Nitrato redutase; Uptake of nitrogen; FBN; Zea mays; Fertilização nitrogenada; Metabolismo; Enzyme activity; Atividade enzimática; Memória Johanna Döbereiner.
Ano: 1998 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1053807
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Efeito da adubacao nitrogenada e da inoculacao com bacterias diazotroficas no comportamento bioquimico da cultivar de milho nitroflint. Repositório Alice
MACHADO, A.T.; SODEK, L.; DOBEREINER, J.; REIS, V.M..
Com o objetivo de verificar o efeito da adubacao nitrogenada e da inoculacao de bacterias diazotroficas no comportamento genetico e bioquimico da cultivar de milho (Zea mays L.) Nitroflint, foram realizados dois experimentos: o primeiro no campo e o segundo em casa de vegetacao. O delineamento experimental foi de blocos ao acaso com tres repeticoes e dois fatores de avaliacao: inoculacao de bacterias diazotroficas (com e sem) e adubacao nitrogenada (100 kg/ha de N e 10 kg/ha de N). No primeiro experimento, os caracteres avaliados foram: producao de graos, nitrogenio total acumulado na planta (parte aerea) e no grao, atividade das enzimas nitrato redutase e glutamina sintetase. No segundo, avaliou-se peso da planta (peso fresco) e a atividade das enzimas...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Zea mays; Absorcao de nitrogenio; Utilizacao de nitrogenio; Glutamina sintetase; Nitrato redutase; Uptake of nitrogen; Utilization of nitrogen; Glutamine syntetase; Nitrate reductase.
Ano: 1998 URL: http://www.alice.cnptia.embrapa.br/handle/doc/89457
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Effect of low light on yield and physiological attributes of rice International Rice Research Institute
Lakshmi Praba, M.; Vanangamudi, M.; Thandapani, V..
p.71-73
Palavras-chave: Light intensity; Yields; Yield components; Chlorophyll; Protein; Nitrate reductase; Dry matter; Growth stages.
Ano: 2004 URL: http://hdl.handle.net/123456789/1048
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Effects of solar UV radiation on photosynthesis and enzyme activities (carbonic anhydrase and nitrate reductase) in marine macroalgae from southern Spain RChHN
FIGUEROA,FÉLIX L.; VIÑEGLA,BENJAMÍN.
The effects of solar ultraviolet (UV) radiation during daily cycles on photosynthesis and two key enzymes involved in carbon incorporation, the carbonic anhydrase, and in inorganic nitrogen reduction, the nitrate reductase, of macroalgae from southern Spain are presented. During daily cycles, photoinhibition in several intertidal macroalgae, expressed as decrease in the effective quantum yield from the morning to noon time, was linearly dependent on the daily integrated irradiance. However, recovery, expressed as the increase in the effective quantum yield from noon to the afternoon, presented a different pattern; full recovery was found below daily integrated irradiance of 1.0 x10(4) kJ m-2. However, recovery reached only 50 % at higher irradiances. The...
Tipo: Journal article Palavras-chave: Carbonic anhydrase; Chlorophyll fluorescence; Effective quantum yield; Nitrate reductase; Ultraviolet radiation.
Ano: 2001 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000200003
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Enzyme activities of phytoplankton in the South Shetland Islands (Antarctica) in relation to nutrients and primary production RChHN
IRIARTE,JOSÉ L; GONZÁLEZ,RODRIGO R; QUIÑONES,RENATO A; KANG,SUNG-HO; SHIM,JAE H; VALENZUELA,CYNTHIA P.
Given the potential significance of enzyme activities as a link between internal metabolic pathways and environmental nutrients, we investigated the relationships of nitrate reductase (NR) and alkaline phosphatase (AP) with primary production and inorganic nutrients in South Shetland Islands, Antarctica. Enzymatic activities of the phytoplankton (0.7-210 µm), primary productivity, autotrophic biomass and inorganic nutrients were studied in the upper 100 m depth at nine stations during a cruise in the northwestern area of South Shetland Islands (Antarctica), during late austral spring (December 2000). NR activities fluctuated between 0 and 42.8 nmol L-1 h-1 (mean = 10.08 nmol L-1 h-1, SD = 10.42 nmol L-1 h-1), AP activities between 0.81 and 5.67 nmol L-1...
Tipo: Journal article Palavras-chave: Nitrate reductase; Alkaline phosphatase; Primary productivity; Chlorophyll; Antarctica.
Ano: 2006 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2006000400009
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Establishment of sensitive and resistant variety of tomato on the basis of photosynthesis and antioxidative enzymes in the presence of cobalt applied as shotgun approach Braz. J. Plant Physiol.
Hasan,Syed Aiman; Hayat,Shamsul; Wani,Arif Shafi; Ahmad,Aqil.
Cobalt (Co) affords both beneficial as well as toxic effects to plants. The present study was performed with an aim to find out the varietal differences among five tomato cultivars against the Co induced changes in growth, photosynthesis, nitrate reductase (E.C.1.6.6.1), carbonic anhydrase (E.C.4.2.1.1), antioxidative enzymes i.e. peroxidase (E.C.1.11.1.7), catalase (E.C.1.11.1.6), superoxide dismutase (E.C.1.15.1.1) and that of proline content. Seeds of tomato (varieties, K-25, NTS-9, NBR-Uday, Sarvodya, and Malti) were soaked in 0, 100, 200 or 300 µM CoCl2 for 0, 4, 8, 12 h (shotgun approach) and sampled at 30 days after sowing. All the varieties showed significantly different response to different treatment combinations. Despite substantial varietal...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Antioxidative enzyme; Carbonic anhydrase; Cobalt; Nitrate reductase; Photosynthesis; Tomato.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202011000300001
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Estudo da eficiência de uso do nitrogênio em variedades locais e melhoradas de milho Rev. Bras. Bot.
MAJEROWICZ,NIDIA; PEREIRA,JOSÉ M.S.; MEDICI,LEONARDO O.; BISON,ODAIR; PEREIRA,MAURÍCIO B.; SANTOS JÚNIOR,ULYSSES M..
O uso de fertilizantes, além dos riscos de contaminação ambiental, onera o agricultor, chegando a representar 40% dos custos de produção na cultura do milho. O presente estudo visa identificar características fisiológicas relacionadas com o aumento da eficiência do uso do nitrogênio e assim subsidiar programas de melhoramento genético direcionados para obtenção de genótipos de milho produtivos em solos com baixa disponibilidade de nitrogênio. Foram estudadas as variedades de milho Pedra Dourada, Catetão, Carioca (variedades locais, não melhoradas), BR 106, BR 105 (variedades melhoradas em solos férteis), Nitroflint e Nitrodente (variedades melhoradas em solos pobres em N). Plântulas de milho receberam solução nutritiva de Hoagland modificada quanto às...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Nitrogen assimilation; Glutamine synthetase; Nitrate reductase; Photosynthetic pigments; Zea mays L..
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042002000200002
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Estudo de características biofísicas e bioquímicas adaptativas a submersão de plantas jovens de inga (Inga vera Willd.), virola (Virola surinamensis (Rolland ex Rottb.) Warb.) e seringueira (Hevea brasiliensis Muell. Arg.). Repositório Alice
BOTELHO, M. do N.; OLIVEIRA, L. E. M. de; CARVALHO, C. J. R. de.
bitstream/item/201218/1/Estudo-biofisicas-e-bioquimicas.pdf
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Disponibilidade de oxigênio; Reductase do nitrato; Oxigen; Fisiologia; Hevea Brasiliensis; Seringueira; Virola Surinamensis; Inga vera; Nitrate reductase; Plant physiology.
Ano: 1997 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/394402
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Fast detection of Mycobacterium tuberculosis in culture-positive sputum samples by nitrate reductase activity BJPS
Meneguello,Jean Eduardo; Silva,João Vitor de Oliveira; Lima,Letícia Silva; Siqueira,Vera Lucia Dias; Scodro,Regiane Bertin de Lima; Caleffi-Ferracioli,Katiany Rizzieri; Cardoso,Rosilene Fressatti.
ABSTRACT Microscopy and bacterial culture are the main tools in the diagnosis of tuberculosis. Since the slow growth of Mycobacterium tuberculosis impairs rapid diagnosis strategies, especially in countries where the latter are the only available resources, the ongoing development of new and inexpensive tools based on mycobacterial metabolism optimizing growth detection with preliminary identification is greatly welcome. When compared to the other species from the M. tuberculosis complex, M. tuberculosis is a strong nitrate reducer. Current assay compares the nitrate reductase activity of M. tuberculosis from pulmonary specimens cultivated in nitrate-supplemented media. Fifty-five sputum samples were decontaminated and inoculated in conventional...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Tuberculosis; Mycobacteria/diagnosis/identification; Nitrate reductase.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502018000100602
Registros recuperados: 26
Primeira ... 12 ... Última
 

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