Ureides
Mostrando 1-12 de 31 artigos, teses e dissertações.
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1. Physiological and N2-fixation-related traits for tolerance to drought in soybean progenies
Resumo: O objetivo deste trabalho foi avaliar seis genótipos de soja (Glycine max) quanto aos parâmetros fisiológicos e à fixação biológica de nitrogênio, em condições de restrição hídrica, e sua capacidade de recuperação após reidratação, com base em componentes de produção. Os genótipos avaliados em casa de vegetação foram os seguint
Pesq. agropec. bras.. Publicado em: 11/11/2019
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2. An Appraisal on the Source-to-Sink Relationship in Plants: an Application of Desorption Electrospray Ionization Mass Spectrometry Imaging
Amino acids/ureides and carbohydrates are the main nutrients for the plants growth. These metabolites are continuously translocated through the plant organism via well-known transportation mechanisms. The well-established source-to-sink relationship involves the transfer of these nutrients from mature (source) to young (sink) leaves. Desorption electrospray
J. Braz. Chem. Soc.. Publicado em: 2018-01
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3. Water restriction and physiological traits in soybean genotypes contrasting for nitrogen fixation drought tolerance
ABSTRACT Biological nitrogen fixation (BNF) is essential to the economic viability of the soybean [Glycine max (L.) Merrill] crop in Brazil, but drought may impair the BNF processes. We evaluated physiological traits of nitrogen fixation drought-tolerant (NFDT) (R01-581F, R01-416F and R02-1325) and drought-susceptible (CD 215 and BRS 317) genotypes of soybea
Sci. agric. (Piracicaba, Braz.). Publicado em: 2017-04
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4. Alterations in the metabolism of nitrogenous compounds in Calopogonium mucunoides in response to different nitrogen sources : effects on nodulation and fixation / Alterações no metabolismo de compostos nitrogenados em Calopogonium mucunoides em resposta a diferentes fontes de nitrogênio : efeitos na nodulação e na fixação
Calopogonium mucunoides é uma leguminosa tropical típica de cerrado, sendo muito utilizada em adubação verde e como forrageira. Possui alta capacidade de fixação de nitrogênio, sendo cultivada em solos de baixo pH e pouca fertilidade; e boa resistência à seca, mas não tolera baixas temperaturas. Poucos são os estudos acerca do metabolismo de nitro
Publicado em: 2007
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5. The role of nitrate reductase and asparagine synthetase in soybean (Glycine max L.) under nitrogen stress / Papel da redutase do nitrato e da asparagina sintetase em plantas de soja (Glycine max L.) sob condições de estresse de nitrogenio
The root system of soybean (Glycine max L.) is an important site for the assimilation of nitrogen, whether by nitrate assimilation in the roots, or by symbiotic nitrogen fixation in the nodules. The main products of inorganic nitrogen assimilation, the amino acids asparagine and glutamine and the ureides allantoin and allantoic acid, are used in the transpor
Publicado em: 2007
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6. Papel da alantoina na nutrição nitrogenada e resposta antioxidativas de celulas de cafe em suspensão
Cellular suspension of coffee was used as model to study the role of allantoin in nitrogen nutrition of coffee and the effect of abiotics stress on antioxidant enzymes in coffee. Some studies have reported on the importance of the ureides as nitrogen source in algae and yeast. However, knowing that allantoin is a nitrogen source of N2-fixing plants, informat
Publicado em: 2004
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7. Feijão-de-porco [Cnavalia ensiformis (L.) D.C.] cultivado com diferentes fontes de nitrogenio : fixação de N2, fotossintese e crescimento
Several reports point to a negative effect of mineral N on the fonnation and activity of root nodules in legumes that fix the N2 by simbiotic association with rizobia. However, there are few studies establishing a relation between aspects ofthe photosynthesis and the source of N. In this study, an investigation was carried out to verify the influence of the
Publicado em: 2004
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8. Fixação e reações de assimilação de N em Crotalaria juncea L
Crotalaria juncea L. is a legume widely used as green manure. The objective of this work was to obtain basic information on the influence of the N-NH/ in the growth and production of nitrogen compounds and enzymes involved in nitrogen assimilation in this species. The responses of plants, inoculated (I) or not (NI) with Rhizobium to the presence (+N) or abse
Publicado em: 2002
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9. Metabolismo de ureideos e asparagina durante a ontogenia do fruto de plantas de soja nodulados e não-nodulados
The synthesis and accumulation of reserve proteins in seeds require a large supply of reduced nitrogen. Generally, the transport of nitrogen from other parts of the plant involves a few specific compounds, the nature of which depends on the species and growth conditions. The fixation of N 2 by Rhizobium in symbiotic association with soybeans, cultivated in t
Publicado em: 1982
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10. Inhibition of N2 Fixation in Soybean Is Associated with Elevated Ureides and Amino Acids1
Decreased N2 fixation in soybean (Glycine max) L. Merr. during water deficits has been associated with increases in ureides and free amino acids in plant tissues, indicating a potential feedback inhibition by these compounds in response to drought. We evaluated concentrations of ureides and amino acids in leaf and nodule tissue and the concurrent change in N
American Society of Plant Biologists.
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11. Urease Is Not Essential for Ureide Degradation in Soybean.
The hypothesis that soybean (Glycine max L. [Merrill]) catabolizes ureides to urea to a physiologically significant extent was tested and rejected. Urease-negative (eu3-e1/eu3-e1) plants were supported by fixed N2 or by 2 mM NH4NO3, so that xylem-borne nitrogen contained predominantly ureides (allantoin and allantoic acid) or amide amino acids, respectively.
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12. The Assimilation of Ureides in Shoot Tissues of Soybeans 1: 1. CHANGES IN ALLANTOINASE ACTIVITY AND UREIDE CONTENTS OF LEAVES AND FRUITS
The ureides, allantoin and allantoic acid, are major forms of N transported from nodules to shoots in soybeans (Merr.). Little is known about the occurrence, localization, or properties of the enzymes involved in the assimilation of ureides in shoot tissues. We have examined the capacity of the shoot tissues to assimilate allantoin via allantoinase (EC 3.5.2