Elevated CO2 improved the growth of a double nitrate reductase defective mutant of Arabidopsis thaliana: the importance of maintaining a high energy status

Jauregui, Ivan and Aparicio-Tejo, Pedro M. and Baroja, Edurne and Avila, Concepción and Aranjuelo, Iker (2017) Elevated CO2 improved the growth of a double nitrate reductase defective mutant of Arabidopsis thaliana: the importance of maintaining a high energy status. Environmental and Experimental Botany, 140. pp. 110-119. ISSN 0098-8472

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Impairments in leaf nitrogen (N) assimilation in C3 plants have been identified as processes conditioning photosynthesis under elevated [CO2], especially when N is supplied as nitrate. Leaf N status is usually improved under ammonium nutrition and elevated [CO2]. However, ammonium fertilization is usually accompanied by the appearance of oxidative stress symptoms, which constrains plant development. To understand how the limitations of direct fertilization with ammonium (growth reduction attributed to ammonium toxicity) can be overcome, the effects of elevated [CO2] (800 ppm) exposure were studied in the Arabidopsis thaliana double nitrate reductase defective mutant, nia1-1/chl3-5 (which preferentially assimilates ammonium as its nitrogen source). Analysis of the physiology, metabolites and gene expression was carried out in roots and shoot organs. Our study clearly showed that elevated [CO2] improved the inhibited phenotype of the nitrate reductase double mutant. Both the photosynthetic rates and the leaf N content of the NR mutant under elevated CO2 were similar to wild type plants. The growth of the nitrate reductase mutant was linked to its ability to overcome ammonium-associated photoinhibition processes at 800 ppm [CO2]. More specifically: (i) the capacity of NR mutants to equilibrate energy availability, as reflected by the electron transport equilibrium reached (photosynthesis, photorespiration and respiration), (ii) as well as by the upregulation of genes involved in stress tolerance were identified as the processes involved in the improved performance of NR mutants.

Item Type:
Journal Article
Journal or Publication Title:
Environmental and Experimental Botany
Additional Information:
This is the author’s version of a work that was accepted for publication in Environmental and Experimental Botany. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Environmental and Experimental Botany, 140, 2017 DOI: 10.1016/j.envexpbot.2017.06.003
Uncontrolled Keywords:
?? [co2]plant physiologynitrate reductaseammoniumphotosynthesisroot-to-shoottranscriptomicsredoxplant scienceecology, evolution, behavior and systematicsagronomy and crop science ??
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13 Jun 2017 14:14
Last Modified:
28 Jun 2024 00:46