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Título

Harvest index, a parameter conditioning responsiveness of wheat plants to elevated CO2

Autor Aranjuelo, Iker ; Sanz-Sáez, Álvaro; Jauregui, Iván; Irigoyen, Juan José ; Araus, José Luis; Sánchez-Díaz, Manuel ; Erice, Gorka
Palabras clave 2D proteomic
Wheat
Harvest index
CO2
Acclimation
Fecha de publicación 5-abr-2013
EditorOxford University Press
Citación Journal of Experimental Botany 64(7): 1879-1892 (2013)
ResumenThe expansion of the world's population requires the development of high production agriculture. For this purpose, it is essential to identify target points conditioning crop responsiveness to predicted [CO2]. The aim of this study was to determine the relevance of ear sink strength in leaf protein and metabolomic profles and its implications in photo-synthetic activity and yield of durum wheat plants exposed to elevated [CO2]. For this purpose, a genotype with high harvest index (HI) (Triticum durum var. Sula) and another with low HI (Triticum durum var. Blanqueta) were exposed to elevated [CO2] (700 μmol mol-1 versus 400 μmol mol -1 CO2) in CO2 greenhouses. The obtained data highlighted that elevated [CO2] only increased plant growth in the genotype with the largest HI; Sula. Gas exchange analyses revealed that although exposure to 700 μmol mol-1 depleted Rubisco content, Sula was capable of increasing the light-saturated rate of CO2 assimilation (Asat) whereas, in Blanqueta, the carbohydrate imbalance induced the down-regulation of Asat. The specific depletion of Rubisco in both genotypes under elevated [CO2], together with the enhancement of other proteins in the Calvin cycle, revealed that there was a redistribution of N from Rubisco towards RuBP regeneration. Moreover, the down-regulation of N, NO3 -, amino acid, and organic acid content, together with the depletion of proteins involved in amino acid synthesis that was detected in Blanqueta grown at 700 μmol mol-1 CO2, revealed that inhibition of N assimilation was involved in the carbohydrate imbalance and consequently with the down-regulation of photosynthesis and growth in these plants. © The Author(s) [2013].
Versión del editorhttp://doi.org/10.1093/jxb/ert081
URI http://hdl.handle.net/10261/97552
DOI10.1093/jxb/ert081
Identificadoresissn: 0022-0957
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