Redução de nitrato em plantas jovens de café cultivadas em diferentes níveis de luz e de nitrogênio

Carelli, Maria; Fahl, Joel Irineu; Magalhães, Antonio Celso Novaes de

doi:10.1590/s0006-87051990000100001

Cited by 8 publications

(5 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…On the other hand, leaf NRA was positively correlated with carbon assimilation (r = 0.78, P< 0.01) in response to irradiance regimes. Under intense shading carbon and nitrogen assimilation were limited in a similar way, while under moderate shading (around 800 μmol.m -2 .s -1 ), under which conditions both nitrate (Carelli et al 1990b) and carbon assimilation are favored (Carelli et al, 1999), these two pathways achieved the highest values (Carelli and Fahl, 2005). These results emphasize that nitrate and carbon assimilation are highly coordinated in coffee leaves and respond to irradiance regimes, as previously documented for the ageing leaf .…”

Section: Partitioning Of Nra Between Leaves and Rootssupporting

confidence: 77%

See 1 more Smart Citation

Aspects of nitrogen metabolism in coffee plants

Carelli

Fahl

Ramalho

2006

Braz. J. Plant Physiol.

Self Cite

View full text Add to dashboard Cite

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. Key words: Coffea, irradiance level, nitrate reductase, nitrogen fertilization, oxidative stress, photoinhbition, photoprotection, photosynthesis.Aspectos do metabolismo de nitrogênio em plantas de café: Plantas de cafédemandam grandes quantidades de N. Apesar da importância da nutrição nitrogenada para o desenvolvimento, aclimatação e produtividade de plantas de café, são poucos os trabalhos sobre o metabolismo de N nesta espécie. A intensão desta revisão é sumarizar a informação disponível na literatura e discutir a influência das condições ambientais na assimilação de N, assim como comentar e discutir alguns resultados aparentemente contraditórios e levantar e destacar perguntas sobre a assimilação de N em plantas de café. Palavras-chave: Coffea, estresse oxidativo, fertilização nitrogenada, fotoinibição, fotoproteção, fotossíntese, nível de irradiância, redutase do nitrato.Abbreviations -A, net photosynthetic rate; A max , photosynthetic capacity at CO 2 and light saturating conditions; C16:0, palmitic acid; C18:3, linolenic acid; 3 Car triplet state of β-carotene; chl, chlorophyll; 1 chl, singlet state of chl; 3 chl*, triplet state of chl; cyt, cytochrome; DEPS, de-epoxidation state; F o , minimal fluorescence of antennae in dark-adapted leaves; F v /F m and F v´/ F m´, photochemical efficiency of PSII in dark-adapted leaves and under photosynthetic steadystate conditions, respectively; H 2 O 2 , hydrogen peroxide; LHC, light harvesting complexes associated with photosystems; J max , electron transport capacity; NR, nitrate reductase; NRA, nitrate reductase activity; O 2•-, superoxide anion radical; 1 O 2 , singlet state of oxygen; OEC, oxygen-evolving complex from PSII; • OH, hydroxyl radical; P 680 , PSII reaction centre; PPFD, photosynthetic photon flux density; PSI and II, photosystem I and II, respectively; Q A , quinone A; q E , "high-energy" quenching; q NP , non-photochemical quenching; q P , photochemical quenching; TFA, total fatty acids; V cmax , maximum carboxylation activity; Φ, quantum yield of photosynthesis; φ e , estimation of the quantum yield of photosynthetic electron transport.

show abstract

Section: Partitioning Of Nra Between Leaves and Rootssupporting

confidence: 77%

“…Leaf NRA is always higher in plants grown under 50 % full-sunlight than in plants under full sunlight (Faleiros et al, 1975;Carelli et al, 1990b;Carelli and Fahl, 2000;Andrade Neto, 2005). The effect of irradiance regime on root NRA will be discussed in the next section.…”

Section: Introductionmentioning

confidence: 99%

Aspects of nitrogen metabolism in coffee plants

Carelli

Fahl

Ramalho

2006

Braz. J. Plant Physiol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…In vitro determination of NR activity in maize leaves was performed according to the methods proposed by Jaworski (1974) and Carelli et al (1990). Incubation solution (buffer phosphate 0.1 M pH 7.5, KNO3, n-propanol 3%) was added to the materials collected in vivo, and samples were then filtered by vacuum and incubated in a warm bath at 30°C for 40 min.…”

Section: Activity Of Nrmentioning

confidence: 99%

Transcriptional modulation of genes encoding nitrate reductase in maize (Zea mays) grown under aluminum toxicity

Cantú¹,

Vieira²,

Piffer³

et al. 2016

Afr. J. Biotechnol.

View full text Add to dashboard Cite

The free aluminum (Al) content in soil can reach levels that are toxic to plants, and this has frequently limited increased productivity of cultures. Four genes encoding nitrate reductase (NR) were identified, named ZmNR1-4. With the aim of evaluating NR activity and the transcriptional modulation of the ZmNR1, ZmNR2, ZmNR3, and ZmNR4 genes in leaves, 30-day-old hybrid maize BRAS 3010 plants were irrigated with a solution of Al 2 (SO 4) 3 .18H 2 O for 16 days. The transcriptional levels of ZmNR2, ZmNR3, and ZmNR4 and NR activity will exhibit standard changes similar in the leaves, where, from the second week of stress onwards, there was a decrease in enzymatic activity and in the accumulation of transcripts. An increase ZmNR1 mRNA levels were observed, indicating that this gene may be associated with other metabolic pathways. This study resulted in the identification and characterization of different genes that encode NR and are involved in nitrogen metabolism in maize, in which the ZmNR2, ZmNR3, and ZmNR4 genes regulate the activity of NR in response to aluminum stress. The characterization of these genes may help in our understanding of the genetic-molecular and physiological mechanisms of maize subjected to aluminum stress.

show abstract

“…De acordo com Stitt et al (2002) Provavelmente, parte das reservas da energia produzida durante o período luminoso seriam utilizadas para ativar a RN (Carelli et al, 1990;Queiroz et al, 1993).…”

Section: Atividade Da Redutase De Nitrato (Rn)unclassified

“…Coffea arabica L. cv Obatã IAC 1669-20 cultivadas a pleno sol e a meia sombra às 7:00 h, 12:00 h, 17:00 h e 22:00 h A elevada atividade da GS nas primeiras horas do período luminoso pode estar relacionada com a atividade da RN no período noturno antecedente, uma vez que o cafeeiro, diferente de outras plantas, apresenta grande atividade da R-NO 3 -no escuro (Faleiros et al, 1975;Cordeiro et al, 1984;Carelli et al, 1990), apresentando um pico no final da noite (Queiroz et al, 1993 ) para a ação da glutamina sintetase na antemanhã.…”

Section: Figura 5 -Médias Da Atividade Da Glutamina Sintetase (Gs) Emunclassified

Atividade das enzimas redutase do nitrato e glutamina sintetase em cafeeiro arábica.

Netto¹,

de²

View full text Add to dashboard Cite

Redução de nitrato em plantas jovens de café cultivadas em diferentes níveis de luz e de nitrogênio

Abstract: NITRATE REDUCTION IN YOUNG COFFEE TREES GROWN UNDER DIFFERENT LEVELS OF LIGHT AND NITROGENThe effect of levels of light and nitrogen on the activity of the enzyme nitrate reductase and its relationship with the availability of sugars and

Cited by 8 publications

References 18 publications

Aspects of nitrogen metabolism in coffee plants

Aspects of nitrogen metabolism in coffee plants

Transcriptional modulation of genes encoding nitrate reductase in maize (Zea mays) grown under aluminum toxicity

Atividade das enzimas redutase do nitrato e glutamina sintetase em cafeeiro arábica.

Contact Info

Product

Resources

About