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

Author: Aranjuelo, I.
Author: Cabrera-Bosquet, L.
Author: Morcuende, R.
Author: Avice, J.C.
Author: Nogues, S.
Author: Araus, J.L.
Author: Martinez-Carrasco, R.
Author: Perez, P.
Year: 2011
ISSN: 0022-0957
ISSN: 1460-2431
Abstract: Wheat plants (Triticum durum Desf., cv. Regallo) were grown in the field to study the effects of contrasting [CO2] conditions (700 versus 370 ìmol 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 (ä13C) 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 ä13C of ear total organic matter and respired CO2, soluble sugar ä13C 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.
Format: PDF
Language: English
Publisher: Oxford University Press
Publisher: Society for Experimental Biology
Copyright: CIMMYT manages Intellectual Assets as International Public Goods. The user is free to download, print, store and share this work. In case you want to translate or create any other derivative work and share or distribute such translation/derivative work, please contact indicating the work you want to use and the kind of use you intend; CIMMYT will contact you with the suitable license for that purpose.
Type: Article
Region: Global
Pages: 3957-3969
Issue: 11
Volume: 62
DOI: 10.1093/jxb/err095
Keywords: C Management
Keywords: Elevated CO2
Keywords: Photosynthetic Acclimation
Keywords: Proteomic Characterization
Agrovoc: RuBisCO
Journal: Journal of Experimental Botany

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  • Wheat
    Wheat - breeding, phytopathology, physiology, quality, biotech

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