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Does ear C sink strength contribute to overcoming photosynthetic acclimation of wheat plants exposed to elevated CO2?

AuthorsAranjuelo, Iker ; Cabrera-Bosquet, Llorenç; Morcuende, Rosa ; Avice, Jean Christophe; Nogués, Salvador; Araus, José Luis; Martínez-Carrasco, Rafael ; Pérez Pérez, Pilar
KeywordsC management
Elevated CO2
Photosynthetic acclimation
Proteomic characterization
Stable isotopes
Issue DateJul-2011
PublisherOxford University Press
CitationJournal of Experimental Botany 62(11): 3957-3969 (2011)
AbstractWheat plants (Triticum durum Desf., cv. Regallo) were grown in the field to study the effects of contrasting [CO 2] 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 CO 2. The ambient 13C/ 12C isotopic composition (δ 13C) of air CO 2 was changed from-10.2‰ in ambient [CO 2] to-23.6‰ under elevated [CO 2] between the 7th and the 14th days after anthesis in order to study C assimilation and partitioning between leaves and ears. Elevated [CO 2] 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 [CO 2] negatively affected Rubisco and Rubisco activase protein content and induced photosynthetic down-regulation. CO 2 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 δ 13C of ear total organic matter and respired CO 2, soluble sugar δ 13C revealed that a small amount of labelled C reached the ear. The 12CO 2 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.
Description13 p., 3 tables, 6 figures and bibliography
Publisher version (URL)http://dx.doi.org/10.1093/jxb/err095
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