English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/18949
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:


Acclimation to future atmospheric CO2 levels increases photochemical efficiency and mitigates photochemistry inhibition by warm temperatures in wheat under field chambers.

AuthorsGutiérrez del Pozo, Diego ; Gutiérrez Rodríguez, Elena; Pérez Pérez, Pilar ; Morcuende, Rosa ; Verdejo, Ángel L. ; Martínez-Carrasco, Rafael
chlorophyll a:b ratio;
chlorophyll fluorescence
carbon assimilation
elevated CO2
elevated temperature
crop yield
Issue Date2009
CitationPhysiologia Plantarum 137,.86-100. (2009)
AbstractA study was conducted over two years to determine whether growth under elevated CO2 (700 μmol mol-1) and temperature (ambient + 4ºC) conditions modifies photochemical efficiency or only the use of electron transport products in spring wheat grown in field chambers. Elevated atmospheric CO2 concentrations increased crop dry matter at maturity by 12%-17%, while above-ambient temperatures did not significantly affect dry matter yield. In measurements with ambient CO2 at ear emergence and after anthesis, growth at elevated CO2 concentrations decreased flag leaf light-saturated carbon assimilation. The quantum yield of electron transport (ΦPSII) measured at ambient CO2 and higher irradiances increased at ear emergence and decreased after anthesis in plants grown at elevated CO2. At higher light intensities, but not in low light, photochemical quenching (qP) decreased after growth in elevated CO2 conditions. Growth under CO2 enrichment increased dark- (Fv:Fm) and light-adapted (Fv’:Fm’) photochemical efficiencies, and decreased the chlorophyll a:b ratio, suggesting an increase in light-harvesting complexes relative to PSII reaction centres. A relatively higher decrease in carbon assimilation than the decrease in ΦPSII pointed to a sink other than CO2 assimilation for electron-transport products at defined growth stages. With higher light intensities, warmer temperatures increased ΦPSII and Fv’:Fm’ at ear emergence and decreased ΦPSII after anthesis; in ambient -but not elevated- CO2, warmer temperatures also decreased qP after anthesis. CO2 fixation increased or did not change with temperature, depending on the growth stage and year. We conclude that elevated CO2 decreases the carbon assimilation capacity, but increases photochemistry and resource allocation to light harvesting, and that elevated levels of CO2 can mitigate photochemistry inhibition due to warm temperatures.
Publisher version (URL)http://www.wiley.com/bw/journal.asp?ref=0031-9317&site=1
Appears in Collections:(IRNASA) Artículos
Files in This Item:
File Description SizeFormat 
Physiol_Plant_137_2009.pdf225,16 kBAdobe PDFThumbnail
Show full item record
Review this work

Related articles:

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.