English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/5106
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Title

Responses of Sugar Beet Roots to Iron Deficiency. Changes in Carbon Assimilation and Oxygen Use

AuthorsLópez-Millán, Ana Flor ; Morales Iribas, Fermín ; Andaluz, Sofía ; Gogorcena Aoiz, Yolanda ; Abadía Bayona, Anunciación ; De Las Rivas, Javier ; Abadía Bayona, Javier
Issue DateOct-2000
PublisherAmerican Society of Plant Physiologists
CitationPlant Physiology 124(2): 885–898 (2000)
AbstractDifferent root parts with or without increased iron-reducing activities have been studied in iron-deficient and iron-sufficient control sugar beet (Beta vulgaris L. Monohil hybrid). The distal root parts of iron-deficient plants, 0 to 5 mm from the root apex, were capable to reduce Fe(III)-chelates and contained concentrations of flavins near 700 μm, two characteristics absent in the 5 to 10 mm sections of iron-deficient plants and the whole root of iron-sufficient plants. Flavin-containing root tips had large pools of carboxylic acids and high activities of enzymes involved in organic acid metabolism. In iron-deficient yellow root tips there was a large increase in carbon fixation associated to an increase in phosphoenolpyruvate carboxylase activity. Part of this carbon was used, through an increase in mitochondrial activity, to increase the capacity to produce reducing power, whereas another part was exported via xylem. Root respiration was increased by iron deficiency. In sugar beet iron-deficient roots flavins would provide a suitable link between the increased capacity to produce reduced nucleotides and the plasma membrane associated ferric chelate reductase enzyme(s). Iron-deficient roots had a large oxygen consumption rate in the presence of cyanide and hydroxisalycilic acid, suggesting that the ferric chelate reductase enzyme is able to reduce oxygen in the absence of Fe(III)-chelates.
Publisher version (URL)http://dx.doi.org/10.1104/pp.124.2.885
URIhttp://hdl.handle.net/10261/5106
DOI10.1104/pp.124.2.885
ISSN1532-2548
Appears in Collections:(IRNASA) Artículos
(EEAD) Artículos
Files in This Item:
File Description SizeFormat 
Responses of Sugar.pdf394,95 kBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.