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


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  


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



Otros recursos del mismo autor(es)

  1. Notas sobre a noção de caráter em Reich This article intends to extend the understanding of the theoretical foundations of the propositions ...
  2. “Projeto Querença": redes e parcerias como base para o desenvolvimento local e um turismo comunitário e criativo na aldeia de Querença - Portugal This paper is based on the research that describes the paths and the actions of “Project Querença” (...
  3. Chlorophyll fluorescence imaging as a tool to understand the impact of iron deficiency and ressupply on photosynthetic performance of strawberry plants Bare-root transplants of strawberry (Fragaria × ananassa Duch. cv ‘Diamond’) were grown in a Hoaglan...
  4. Primeiro registro de "Chalcodermus bicolor" (Coleoptera : "Curculionidae") em plantios de eucalipto This research aimed to record, for the first time, the damage caused by a pruner beetle on hybrid eu...
  5. An AHP-based framework for logistics operations in distribution centres In retail distribution centres (DCs), the handling and storage of products typically represent the l...

Otros recursos de la mismacolección

  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.