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

A - Papers appearing in refereed journals

Jauregui, I., Aroca, R., Garnica, M., Zamarreno, A. M., Garcia-Mina, J. M., Serret, M. D., Parry, M. A. J., Irigoyen, J. J. and Aranjuelo, I. 2015. Nitrogen assimilation and transpiration: key processes conditioning responsiveness of wheat to elevated [CO2] and temperature. Physiologia Plantarum. 155 (3), pp. 338-354.

AuthorsJauregui, I., Aroca, R., Garnica, M., Zamarreno, A. M., Garcia-Mina, J. M., Serret, M. D., Parry, M. A. J., Irigoyen, J. J. and Aranjuelo, I.
Abstract

Although 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 mu molmol(-1)) and temperature (ambient vs ambient+4 degrees 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.

KeywordsPlant Sciences
Year of Publication2015
JournalPhysiologia Plantarum
Journal citation155 (3), pp. 338-354
Digital Object Identifier (DOI)doi:10.1111/ppl.12345
PubMed ID25958969
Open accessPublished as non-open access
FunderSpanish National Research and Development Program
Spanish Ministry of Economy and Competitiveness
Ramon y Cajal research grant (Spanish Economy and Competiveness Ministry)
Funder project or codeWheat
[20:20 Wheat] Maximising yield potential of wheat
PublisherWiley
ISSN0031-9317

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