1) La descarga del recurso depende de la página de origen
2) Para poder descargar el recurso, es necesario ser usuario registrado en Universia


Opción 1: Descargar recurso

Opción 2: Descargar recurso

Opción 3: Descargar recurso

Detalles del recurso

Descripción

The effects of drought on the activity of nitrate reductase (NR) were studied in Helianthus annuus L. plants subjected to soil drying and subsequent rewatering. Drought did not negatively affect the activation state of NR, but resulted in linearly correlated decreases in the activity of the unphosphorilated active form and the total activity of NR, both in roots and leaves. The concentration of nitrate in roots, xylem and leaves also decreased in waterstressed plants, whereas the concentration of total amino acids was only transiently depressed at the leaf level. In contrast, soluble sugars accumulated both in roots and leaves of waterstressed plants. Drought-induced decrease in root NR activity was correlated with the observed changes in root nitrate concentration. A higher percentage of the decrease in foliar NR activity could be explained by the decline in nitrate flux to the leaves than by leaf nitrate content. Following rewatering, the extent of recovery of NR activity was higher in roots than in leaves. The delay in the recovery of foliar NR activity did not result from the persistence of reduced flux of nitrate through the xylem. Several hypotheses to explain the after-effect of soil drying on foliar NR activity are discussed.

Pertenece a

Sapientia Repositório Institucional Universidade do Algarve  

Autor(es)

Azedo -  Silva, João -  Osório, Júlio -  Fonseca, Filomena -  Correia, Maria João - 

Id.: 55209777

Idioma: eng  - 

Versión: 1.0

Estado: Final

Palabras claveStress hídrico - 

Tipo de recurso: article  - 

Tipo de Interactividad: Expositivo

Nivel de Interactividad: muy bajo

Audiencia: Estudiante  -  Profesor  -  Autor  - 

Estructura: Atomic

Coste: no

Copyright: sí

: openAccess

Requerimientos técnicos:  Browser: Any - 

Fecha de contribución: 23-oct-2013

Contacto:

Localización:

Otros recursos del mismo autor(es)

  1. Toll-Like Receptor 9 Signaling in Dendritic Cells Regulates Neutrophil Recruitment to Inflammatory Foci following Leishmania infantum Infection Leishmania infantum is a protozoan parasite that causes visceral leishmaniasis (VL). This infection ...
  2. Utilização de glicopolímeros anfifílicos na distribuição de fármacos Dissertação para obtenção do grau de Mestre no Instituto Superior de Ciências da Saúde Egas Moniz
  3. Endogenous hepatitis C virus homolog fragments in European rabbit and hare genomes replicate in cell culture. Endogenous retroviruses, non-retroviral RNA viruses and DNA viruses have been found in the mammalian...
  4. Characteristics of HIV-2 and HIV-1/HIV-2 Dually Seropositive Adults in West Africa Presenting for Care and Antiretroviral Therapy: The IeDEA-West Africa HIV-2 Cohort Study. HIV-2 is endemic in West Africa. There is a lack of evidence-based guidelines on the diagnosis, mana...
  5. Cellular Fibroma of the Ovary with Multiloculated Macroscopic Characteristics: Case Report

Otros recursos de la misma colección

  1. What drives distinct ploidy phases of isomorphic biphasic life cycles to occur at uneven abundances Tese de dout., Ciências do Mar, da Terra e do Ambiente (Biologia Populacional), Faculdade de Ciência...
  2. Regeneration in Zebrafish (Danio rerio) fins: pattern of expression of mineralization–related Gla proteins Teleost fishes have the exceptional ability to largely regenerate severed appendages comprising seve...
  3. Identificação de Malformações Esqueléticas em Peixes - Monitorizar e identificar as principais malformações que ocorrem em peixes produzidos em aquacul...
  4. Gla proteins as markers for studies of skeletal development and malformations in new aquaculture fish species (Pagrus auriga, Diplodus sargo and Scophtalmus maximus) Evaluation of the onset and the development of skeletal structures during larval ontogeny of commerc...
  5. Investimento em estradas e desenvolvimento regional em Portugal: O processo das auto-estradas Scut O objectivo deste trabalho é investigar o impacto económico regional dos investimentos em infra-es...

Aviso de cookies: Usamos cookies propias y de terceros para mejorar nuestros servicios, para análisis estadístico y para mostrarle publicidad. Si continua navegando consideramos que acepta su uso en los términos establecidos en la Política de cookies.