Arabidopsis transcript and metabolite profiles: ecotype-specific responses to open-air elevated [CO(2)]

作者：Li Pinghua; Ainsworth Elizabeth A; Leakey Andrew D B; Ulanov Alexander; Lozovaya Vera; Ort Donald R; Bohnert Hans J^*

来源：Plant, Cell and Environment, 2008, 31(11): 1673-1687.

DOI：10.1111/j.1365-3040.2008.01874.x

• Arabidopsis ecotypes
• elevated CO(2)
• FACE
• metabolite profiling
• transcript profiling

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 (similar to 0.375 mg g(-1)) and elevated (similar to 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 disturbance of the C : N ratio. To different degrees, both ecotypes perceived elevated [CO(2)] as a metabolic perturbation that necessitated increased functions consuming or storing photoassimilate, with Cvi-0 emerging as more capable of acclimating. Elevated [CO(2)] in Arabidopsis favoured adjustments in reactive oxygen species (ROS) homeostasis and signalling that defined genotypic markers.

• 出版日期2008-11