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

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dc.creator López-Millán, Ana Flor
dc.creator Morales Iribas, Fermín
dc.creator Andaluz, Sofía
dc.creator Gogorcena Aoiz, Yolanda
dc.creator Abadía Bayona, Anunciación
dc.creator Rivas, Javier de las
dc.creator Abadía Bayona, Javier
dc.date 2008-06-16T09:23:05Z
dc.date 2008-06-16T09:23:05Z
dc.date 2000-10
dc.date.accessioned 2017-01-31T01:41:46Z
dc.date.available 2017-01-31T01:41:46Z
dc.identifier Plant Physiology 124(2): 885–898 (2000)
dc.identifier 1532-2548
dc.identifier http://hdl.handle.net/10261/5106
dc.identifier 10.1104/pp.124.2.885
dc.identifier.uri http://dspace.mediu.edu.my:8181/xmlui/handle/10261/5106
dc.description Different 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.
dc.description Peer reviewed
dc.format 25098 bytes
dc.format application/pdf
dc.language eng
dc.publisher American Society of Plant Physiologists
dc.relation http://dx.doi.org/10.1104/pp.124.2.885
dc.rights openAccess
dc.title Responses of Sugar Beet Roots to Iron Deficiency. Changes in Carbon Assimilation and Oxygen Use
dc.type Artículo

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