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Title

Nitrogen assimilation and transpiration: Key processes conditioning responsiveness of wheat to elevated [CO2] and temperature

AuthorsJauregui, Iván; Aroca, Ricardo F.; Garnica, María; Zamarreño, Ángel M.; García Mina, José María; Serret, María D.; Parry, Martin; Irigoyen, Juan José ; Aranjuelo, Iker
Issue DateNov-2015
PublisherBlackwell Publishing
CitationPhysiologia Plantarum 155(3): 338-354 (2015)
AbstractAlthough climate scenarios have predicted an increase in [CO2] and temperature conditions, to date few experiments have focused on the interaction of [CO2] and temperature effects in wheat development. Recent evidence suggests that photosynthetic acclimation is linked to the photorespiration and N assimilation inhibition of plants exposed to elevated CO2. The main goal of this study was to analyze the effect of interacting [CO2] and temperature on leaf photorespiration, C/N metabolism and N transport in wheat plants exposed to elevated [CO2] and temperature conditions. For this purpose, wheat plants were exposed to elevated [CO2] (400 vs 700 μmolmol-1) and temperature (ambient vs ambient+4 ° C) in CO2 gradient greenhouses during the entire life cycle. Although at the agronomic level, elevated temperature had no effect on plant biomass, physiological analyses revealed that combined elevated [CO2] and temperature negatively affected photosynthetic performance. The limited energy levels resulting from the reduced respiratory and photorespiration rates of such plants were apparently inadequate to sustain nitrate reductase activity. Inhibited N assimilation was associated with a strong reduction in amino acid content, conditioned leaf soluble protein content and constrained leaf N status. Therefore, the plant response to elevated [CO2] and elevated temperature resulted in photosynthetic acclimation. The reduction in transpiration rates induced limitations in nutrient transport in leaves of plants exposed to elevated [CO2] and temperature, led to mineral depletion and therefore contributed to the inhibition of photosynthetic activity.
Publisher version (URL)http://dx.doi.org/10.1111/ppl.12345
URIhttp://hdl.handle.net/10261/126407
DOI10.1111/ppl.12345
Identifierse-issn: 1399-3054
issn: 0031-9317
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