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dc.contributor.author
Criado, Maria Victoria
dc.contributor.author
Caputo Suarez, Carla Paula
dc.contributor.author
Roberts, Irma
dc.contributor.author
Castro, Maria A.
dc.contributor.author
Barneix, Atilio José
dc.date.available
2018-09-26T15:43:58Z
dc.date.issued
2009-11
dc.identifier.citation
Criado, Maria Victoria; Caputo Suarez, Carla Paula; Roberts, Irma; Castro, Maria A.; Barneix, Atilio José; Cytokinin-induced changes of nitrogen remobilization and chloroplast ultrastructure in wheat (Triticum aestivum); Elsevier Gmbh; Journal of Plant Physiology; 166; 16; 11-2009; 1775-1785
dc.identifier.issn
0176-1617
dc.identifier.uri
http://hdl.handle.net/11336/60878
dc.description.abstract
Nitrogen (N) remobilization in wheat (Triticum aestivum) plants is crucial because it determines the grain protein concentration and the baking quality of flour. In order to evaluate the influence of cytokinins on N remobilization during N starvation, we analyzed various N remobilization parameters in wheat plants that were watered with 6-benzylaminopurine (BAP) either with or without KNO3. Besides, the effects of BAP on protein synthesis were evaluated, and the size and ultrastructure of chloroplasts of BAP-treated plants were studied. BAP supply inhibited N remobilization of plants independently of N supply as shown by the increase in protein, Rubisco, chlorophyll, sugar and starch concentrations in the older leaves, the decrease in amino acid and sugar export to the phloem, and the decrease in protein, Rubisco and chlorophyll concentrations in the younger leaves. Besides, BAP supply increased nitrate reductase activity and decreased nitrate concentration, thus suggesting an increased assimilatory capacity. The increase in protein concentration could be explained mainly by a significant decrease in protein degradation and, to a lesser extent, by an increase in protein synthesis. Finally, an increase both in the size of the chloroplast and in the plastoglobuli and starch contents in BAP-supplied plants was observed. We propose that cytokinins retain the sink activity of the older leaves by inhibiting amino acid and sugar export to the phloem and stimulating assimilate accumulation in the chloroplasts of the older leaves. Besides, BAP may increase protein concentration of the older leaves both by decreasing protein degradation and maintaining protein synthesis even under stress conditions. © 2009 Elsevier GmbH. All rights reserved.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Gmbh
dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Benzylaminopurine
dc.subject
Chloroplast
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Nitrogen Remobilization
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Nitrogen Starvation
dc.subject
Triticum Aestivum
dc.subject.classification
Agricultura
dc.subject.classification
Agricultura, Silvicultura y Pesca
dc.subject.classification
CIENCIAS AGRÍCOLAS
dc.title
Cytokinin-induced changes of nitrogen remobilization and chloroplast ultrastructure in wheat (Triticum aestivum)
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-09-21T20:36:11Z
dc.journal.volume
166
dc.journal.number
16
dc.journal.pagination
1775-1785
dc.journal.pais
Países Bajos
dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Criado, Maria Victoria. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Invetigaciones Bioquímicas y Fisiologicas; Argentina
dc.description.fil
Fil: Caputo Suarez, Carla Paula. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Invetigaciones Bioquímicas y Fisiologicas; Argentina
dc.description.fil
Fil: Roberts, Irma. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Invetigaciones Bioquímicas y Fisiologicas; Argentina
dc.description.fil
Fil: Castro, Maria A.. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Biodiversidad y Biología Experimental; Argentina
dc.description.fil
Fil: Barneix, Atilio José. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Invetigaciones Bioquímicas y Fisiologicas; Argentina
dc.journal.title
Journal of Plant Physiology
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://dx.doi.org/10.1016/j.jplph.2009.05.007
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0176161709002181


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