Para acceder a los documentos con el texto completo, por favor, siga el siguiente enlace: http://hdl.handle.net/2445/47207

Does ear C sink strength contributes to the overcoming of photosynthetic acclimation of wheat plants exposed to elevated CO2?
Aranjuelo Michelena, Iker; Cabrera i Bosquet, Llorenç; Morcuende, R.; Pérez, P.; Avice, J. C.; Nogués Mestres, Salvador; Araus Ortega, José Luis; Martínez Carrasco, R.
Universitat de Barcelona
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.
Blat
Diòxid de carboni
Respiració de les plantes
Wheat
Carbon dioxide
Plant respiration
(c) Aranjuelo Michelena, Iker et al., 2011
Artículo
info:eu-repo/semantics/acceptedVersion
Oxford University Press
         

Mostrar el registro completo del ítem

Documentos relacionados

Otros documentos del mismo autor/a

Aranjuelo Michelena, Iker; Cabrera i Bosquet, Llorenç; Araus Ortega, José Luis; Nogués Mestres, Salvador
Aranjuelo Michelena, Iker; Tcherkez, G.; Molero Milán, Gemma; Gilard, F.; Avice, J. C.; Nogués Mestres, Salvador
Molero Milán, Gemma; Tcherkez, G.; Araus Ortega, José Luis; Nogués Mestres, Salvador; Aranjuelo Michelena, Iker
Baptist, F.; Secher-Fromell, H.; Viard-Cretat, F.; Aranjuelo Michelena, Iker; Clement, J.C.; Creme, A.; Desclos, M.; Laine Ph.; Nogués Mestres, Salvador; Lavorel, S.
Nogués Mestres, Salvador; Aljazairi López, Salvador; Arias, Claudia; Sánchez, Elena; Aranjuelo Michelena, Iker