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

dc.creatorAranjuelo, I.
dc.creatorCabrera-Bosquet, L.
dc.creatorMorcuende, R.
dc.creatorAvice, J.C.
dc.creatorNogues, S.
dc.creatorAraus, J.L.
dc.creatorMartinez-Carrasco, R.
dc.creatorPerez, P.
dc.date2013-06-07T21:12:44Z
dc.date2013-06-07T21:12:44Z
dc.date2011
dc.date.accessioned2023-07-17T19:56:57Z
dc.date.available2023-07-17T19:56:57Z
dc.identifier0022-0957
dc.identifier1460-2431
dc.identifierhttp://hdl.handle.net/10883/2847
dc.identifier10.1093/jxb/err095
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7508962
dc.descriptionWheat 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.
dc.description3957-3969
dc.formatPDF
dc.languageEnglish
dc.publisherOxford University Press
dc.publisherSociety for Experimental Biology
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dc.rightsOpen Access
dc.source11
dc.source62
dc.sourceJournal of Experimental Botany
dc.subjectAGRICULTURAL SCIENCES AND BIOTECHNOLOGY
dc.subjectC Management
dc.subjectElevated CO2
dc.subjectPhotosynthetic Acclimation
dc.subjectProteomic Characterization
dc.subjectPHOTOSYNTHESIS
dc.subjectCARBON DIOXIDE
dc.subjectISOTOPE ANALYSIS
dc.subjectRUBISCO
dc.titleDoes ear C sink strength contribute to overcoming photosynthetic acclimation of wheat plants exposed to elevated CO2?
dc.typeArticle


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