Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
<mark>Journal publication date</mark> | 09/2016 |
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<mark>Journal</mark> | Physiologia Plantarum |
Issue number | 1 |
Volume | 158 |
Number of pages | 15 |
Pages (from-to) | 65-79 |
Publication Status | Published |
Early online date | 16/03/16 |
<mark>Original language</mark> | English |
Although shoot N depletion in plants exposed to elevated [CO2] has already been reported on several occasions, some uncertainty remains about the mechanisms involved. This study illustrates (1) the importance of characterizing root-shoot interactions and (2) the physiological, biochemical and gene expression mechanisms adopted by nitrate-fed Arabidopsis thaliana plants grown under elevated [CO2]. Elevated [CO2] increases biomass and photosynthetic rates; nevertheless, the decline in total soluble protein, Rubisco and leaf N concentrations revealed a general decrease in leaf N availability. A transcriptomic approach (conducted at the root and shoot level) revealed that exposure to 800ppm [CO2] induced the expression of genes involved in the transport of nitrate and mineral elements. Leaf N and mineral status revealed that N assimilation into proteins was constrained under elevated [CO2]. Moreover, this study also highlights how elevated [CO2] induced the reorganization of nitrate assimilation between tissues; root nitrogen assimilation was favored over leaf assimilation to offset the decline in nitrogen metabolism in the leaves of plants exposed to elevated [CO2].