Journal
PLANT CELL AND ENVIRONMENT
Volume 31, Issue 11, Pages 1673-1687Publisher
WILEY
DOI: 10.1111/j.1365-3040.2008.01874.x
Keywords
Arabidopsis ecotypes; elevated CO2; FACE; metabolite profiling; transcript profiling
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Funding
- NSF [DBI-0223905]
- US-DOE
- programme for Ecosystems Research [DE-FG02-04ER63849]
- UIUC institutional grants
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A Free-Air CO2 Enrichment (FACE) experiment compared the physiological parameters, transcript and metabolite profiles of Arabidopsis thaliana Columbia-0 (Col-0) and Cape Verde Island (Cvi-0) at ambient (similar to 0.375 mg g(-1)) and elevated (similar to 0.550 mg g(-1)) CO2 ([CO2]). Photoassimilate pool sizes were enhanced in high [CO2] in an ecotype-specific manner. Short-term growth at elevated [CO2] stimulated carbon gain irrespective of down-regulation of plastid functions and altered expression of genes involved in nitrogen metabolism resembling patterns observed under N-deficiency. The study confirmed well-known characteristics, but the use of a time course, ecotypic genetic differences, metabolite analysis and the focus on clusters of functional categories provided new aspects about responses to elevated [CO2]. Longer-term Cvi-0 responded by down-regulating functions favouring carbon accumulation, and both ecotypes showed altered expression of genes for defence, redox control, transport, signalling, transcription and chromatin remodelling. Overall, carbon fixation with a smaller commitment of resources in elevated [CO2] appeared beneficial, with the extra C only partially utilized possibly due to disturbance of the C : N ratio. To different degrees, both ecotypes perceived elevated [CO2] as a metabolic perturbation that necessitated increased functions consuming or storing photoassimilate, with Cvi-0 emerging as more capable of acclimating. Elevated [CO2] in Arabidopsis favoured adjustments in reactive oxygen species (ROS) homeostasis and signalling that defined genotypic markers.
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