dc.contributor |
Universitat de Barcelona |
dc.contributor.author |
Aranjuelo Michelena, Iker |
dc.contributor.author |
Cabrera i Bosquet, Llorenç |
dc.contributor.author |
Morcuende, Rosa |
dc.contributor.author |
Pérez, Pilar |
dc.contributor.author |
Avice, Jean-Christophe |
dc.contributor.author |
Nogués Mestres, Salvador |
dc.contributor.author |
Araus Ortega, José Luis |
dc.contributor.author |
Martínez Carrasco, Rafael |
dc.date |
2013-10-22T13:47:29Z |
dc.date |
2013-10-22T13:47:29Z |
dc.date |
2011 |
dc.date |
2013-10-22T13:47:29Z |
dc.identifier.citation |
0022-0957 |
dc.identifier.citation |
590751 |
dc.identifier.uri |
http://hdl.handle.net/2445/47207 |
dc.format |
47 p. |
dc.format |
application/pdf |
dc.language.iso |
eng |
dc.publisher |
Oxford University Press |
dc.relation |
Versió postprint del document publicat a: http://dx.doi.org/10.1093/jxb/err095 |
dc.relation |
Journal of Experimental Botany, 2011, vol. 62, num. 11, p. 3957-3969 |
dc.relation |
http://dx.doi.org/10.1093/jxb/err095 |
dc.rights |
(c) Aranjuelo Michelena, Iker et al., 2011 |
dc.rights |
info:eu-repo/semantics/openAccess |
dc.subject |
Blat |
dc.subject |
Diòxid de carboni |
dc.subject |
Respiració de les plantes |
dc.subject |
Wheat |
dc.subject |
Carbon dioxide |
dc.subject |
Plant respiration |
dc.title |
Does ear C sink strength contributes to the overcoming of photosynthetic acclimation of wheat plants exposed to elevated CO2? |
dc.type |
info:eu-repo/semantics/article |
dc.type |
info:eu-repo/semantics/acceptedVersion |
dc.description.abstract |
Wheat plants (Triticum durum Desf., cv. Regallo) were grown in the field to study the effects of contrasting [CO2] conditions (700 versus 370 μmol mol−1) on growth, photosynthetic performance, and C management during the post-anthesis period. The aim was to test whether a restricted capacity of sink organs to utilize photosynthates drives a loss of photosynthetic capacity in elevated CO2. The ambient 13C/12C isotopic composition (δ13C) of air CO2 was changed from-10.2 in ambient [CO2] to-23.6 under elevated [CO2] between the 7th and the 14th days after anthesis in order to study C assimilation and partitioning between leaves and ears. Elevated [CO2] had no significant effect on biomass production and grain filling, and caused an accumulation of C compounds in leaves. This was accompanied by up-regulation of phosphoglycerate mutase and ATP synthase protein content, together with down-regulation of adenosine diphosphate glucose pyrophosphatase protein. Growth in elevated [CO2] negatively affected Rubisco and Rubisco activase protein content and induced photosynthetic down-regulation. CO2 enrichment caused a specific decrease in Rubisco content, together with decreases in the amino acid and total N content of leaves. The C labelling revealed that in flag leaves, part of the C fixed during grain filling was stored as starch and structural C compounds whereas the rest of the labelled C (mainly in the form of soluble sugars) was completely respired 48 h after the end of labelling. Although labelled C was not detected in the δ13C of ear total organic matter and respired CO2, soluble sugar δ13C revealed that a small amount of labelled C reached the ear. The 12CO2 labelling suggests that during the beginning of post-anthesis the ear did not contribute towards overcoming flag leaf carbohydrate accumulation, and this had a consequent effect on protein expression and photosynthetic acclimation. |