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- Title
Arabidopsis transcript and metabolite profiles: ecotype-specific responses to open-air elevated [CO<sub>2</sub>].
- Authors
PINGHUA LI; AINSWORTH, ELIZABETH A.; LEAKEY, ANDREW D. B.; ULANOV, ALEXANDER; LOZOVAYA, VERA; ORT, DONALD R.; BOHNERT, HANS J.
- Abstract
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 (∼0.375 mg g−1) and elevated (∼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.
- Publication
Plant, Cell & Environment, 2008, Vol 31, Issue 11, p1673
- ISSN
0140-7791
- Publication type
Academic Journal
- DOI
10.1111/j.1365-3040.2008.01874.x