Arabidopsis transcript and metabolite profiles: ecotype-specific responses to open-air elevated [CO2

Plant, Cell & Environment
Pinghua LiHans J Bohnert

Abstract

A Free-Air CO(2) 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 (approximately 0.375 mg g(-1)) and elevated (approximately 0.550 mg g(-1)) CO(2) ([CO(2)]). Photoassimilate pool sizes were enhanced in high [CO(2)] in an ecotype-specific manner. Short-term growth at elevated [CO(2)] 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 [CO(2)]. 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 [CO(2)] appeared beneficial, with the extra C only partially utilized possibly due to dist...Continue Reading

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Nov 3, 2010·Nature Genetics·Pinghua LiThomas P Brutnell
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