Nitrate reductase and glutamine synthetase activity in coffee leaves during fruit development

Reis, André Rodrigues dos; Favarin, José Laércio; Gallo, Luiz Antonio; Malavolta, E.; Moraes, Milton Ferreira de; Lavres, José

doi:10.1590/s0100-06832009000200009

Cited by 30 publications

(30 citation statements)

References 19 publications

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“…For both it was observed a similar pattern regarding plant flowering, with higher contents before flowering following constant decrease after that. The reduction of protein levels occurs due to redistribution of nitrogenous compounds from leaves to reproductive organs throughout the plant cycle (Reis et al 2009, Xu et al 2012. During vegetative growth, nitrogen is rapidly absorbed by the roots and transported to the leaves.…”

Section: Discussionmentioning

confidence: 99%

Plant densities and harvesting times on productive and physiological aspects of Stevia rebaudiana Bertoni grown in southern Brazil

Gomes

Moterle

Biasi

et al. 2018

An. Acad. Bras. Ciênc.

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Stevia (Stevia rebaudiana Bertoni) is a species characterized by producing non-caloric substances with high sweetening potential. Among these substances, rebaudioside A and stevioside are produced in greater quantity. Plant density and harvesting time are factors that affects biomass and sweetening compounds yield in this species. The objective of this research was to evaluate the effect of plant densities and harvesting times on the productive and physiological characteristics of stevia in southern Brazil. The experimental design was in randomized blocks, in a split-plot scheme, with 9 treatments comparing the effect of three planting densities (166 667, 83 333 and 33 333 plants ha -1 ) in the plots and three harvesting periods (before, in the beginning and in full flowering) in the subplots. Harvesting at the beginning of flowering promoted higher dry leaf biomass yield and, when associated with the lowest planting density, promoted higher levels of rebaudioside A and stevioside. The lowest planting density resulted in greater leaves biomass accumulation, whereas the highest density promoted higher yields per area. Interaction between density of 166 667 plants ha -1 and the harvest at the onset of flowering promoted higher yields of rebaudioside A (43.22 kg ha -1 ) as well as higher rebaudioside A/stevioside ratio (0.60).

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Section: Discussionmentioning

confidence: 99%

Plant densities and harvesting times on productive and physiological aspects of Stevia rebaudiana Bertoni grown in southern Brazil

Gomes

Moterle

Biasi

et al. 2018

An. Acad. Bras. Ciênc.

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“…In our former study, Reis et al observed the interaction between nitrogen and Se in upland rice under field conditions showing that plants treated with nitrogen can accumulate more Se in seeds. In addition, Se can affect sulfur metabolism and molybdenum concentration in plants, which is co‐factor of nitrate reductase enzyme showing a direct effect on nitrogen metabolism ,,35–37…”

Section: Introductionmentioning

confidence: 99%

“…In addition, Se can affect sulfur metabolism and molybdenum concentration in plants, which is co-factor of nitrate reductase enzyme showing a direct effect on nitrogen metabolism. 23,28,[35][36][37] The application of Se along with nitrogen, phosphorus and potassium (NPK) fertilizer is an effective way to address the low concentrations of Se typically found in human and animal food, as demonstrated by the results of decades of study in Finland. [24][25][26] After the adoption of the Se biofortification programme in Finland, the Se status of the population has improved to optimal levels.…”

Section: Introductionmentioning

confidence: 99%

Agronomic biofortification with selenium impacts storage proteins in grains of upland rice

et al. 2020

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BACKGROUND Selenium (Se) is an essential element for humans and animals. Rice is one of the most commonly consumed cereals in the world, so the agronomic biofortification of cereals with Se may be a good strategy to increase the levels of daily intake of Se by the population. This study evaluated the agronomic biofortification of rice genotypes with Se and its effects on grain nutritional quality. Five rates of Se (0, 10, 25, 50, and 100 g ha −1) were applied as selenate via the soil to three rice genotypes under field conditions. RESULTS Selenium concentrations in the leaves and polished grains increased linearly in response to Se application rates. A highly significant correlation was observed between the Se rates and the Se concentration in the leaves and grains, indicating high translocation of Se. The application of Se also increased the concentration of albumin, globulin, prolamin, and glutelin in polished grains. CONCLUSION Biofortifying rice genotypes using 25 g Se ha −1 could increase the average daily Se intake from 4.64 to 66 μg day−1. Considering that the recommended daily intake of Se by adults is 55 μg day−1, this agronomic strategy could contribute to alleviating widespread Se malnutrition. © 2019 Society of Chemical Industry

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“…The N product of urease activity-ammonia-is incorporated into organic compounds mainly by glutamine synthetase (Sirko and Brodzik 2000). Therefore, nitrate reductase and glutamine synthetase activities might represent the rate-limiting step in N assimilation, as they can be used as a marker for the capacity of roots and shoots to assimilate external N in coffee plants (Reis et al 2009). Due to the importance of N as the main nutrient for plants and its regulatory role in plant metabolism, it has been suggested that nitrate reductase activity is related to plant productivity and/or to a significant response to N fertilization (Malavolta et al 2004;Reis et al 2007Reis et al , 2009.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen metabolism in coffee plants in response to nitrogen supply by fertigation

Neto

Favarin

Reis

et al. 2014

Theor. Exp. Plant Physiol.

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Coffee plants require high application rates of nitrogen (N) to produce coffee beans. However, information regarding plant N uptake and assimilation under intensive high-technology cultivation systems is scarce, a situation which restrains the maximizing productivity with minimal N rates. The aim of this study was to evaluate N assimilation enzymes such as nitrate reductase (EC 1.6.6.1), glutamine synthetase (EC 6.3.1.2), urease (EC 3.5.1.5), and N compounds of coffee plants during a phenological cycle in response to N applied by fertigation. Our study was carried out with 7-year-old trees of Coffea arabica L., under a center pivot sprinkler irrigation and fertigation system, with five N rates (0, 200, 400, 600, and 800 kg ha-1) applied to the coffee field. The results of the present study suggest that both N metabolism enzymes, and the content of nitrate and ammonium in coffee were directly related to the phenological cycle. The N fertigation rates are correlated with the N and amino acid contente. Nitrate reductase and urease showed higher activities before anthesis and during grain filling. Glutamine synthetase showed highest activities during rapid grain expansion. The data also indicate that there is merit in gaining greater understanding of N metabolism in coffee plants grown under high-intensive systems. There is therefore merit in conducting further research on how monitoring the N assimilation enzymes might be used to improve fertilizer management of coffee in commercial orchards.

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Nitrate reductase and glutamine synthetase activity in coffee leaves during fruit development

Cited by 30 publications

References 19 publications

Plant densities and harvesting times on productive and physiological aspects of Stevia rebaudiana Bertoni grown in southern Brazil

Plant densities and harvesting times on productive and physiological aspects of Stevia rebaudiana Bertoni grown in southern Brazil

Agronomic biofortification with selenium impacts storage proteins in grains of upland rice

Nitrogen metabolism in coffee plants in response to nitrogen supply by fertigation

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