期刊
PHYSIOLOGIA PLANTARUM
卷 158, 期 1, 页码 65-79出版社
WILEY
DOI: 10.1111/ppl.12417
关键词
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资金
- Spanish MICIIN [AGL2009-13339-C02-02, AGL2011-30386-C02-02, AGL2012-37815-C05-05]
- Spanish Ministry of Economy and Competitiveness
- Research Council of Lithuania by the project 'Postdoctoral fellowship Implementation in Lithuania'
- Ramon y Cajal research grant (Ministerio de Economia y Competitividad)
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 800 ppm [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].
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