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Acclimation of Arabidopsis thaliana to long‐term CO 2 enrichment and nitrogen supply is basically a matter of growth rate adjustment
Author(s) -
Tocquin Pierre,
Ormenese Sandra,
Pieltain Alexandra,
Detry Nathalie,
Bernier Georges,
Périlleux Claire
Publication year - 2006
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.2006.00791.x
Subject(s) - rubisco , acclimatization , photosynthesis , arabidopsis thaliana , hydroponics , shoot , biology , botany , horticulture , chemistry , biochemistry , mutant , gene
The long‐term response of Arabidopsis thaliana to increasing CO 2 was evaluated in plants grown in 800 μl l −1 CO 2 from sowing and maintained, in hydroponics, on three nitrogen supplies: “low,”“medium” and “high.” The global response to high CO 2 and N‐supply was evaluated by measuring growth parameters in parallel with photosynthetic activity, leaf carbohydrates, ribulose‐1,5‐bisphosphate carboxylase/oxygenase (Rubisco) messenger RNA and protein, stomatal conductance (g s ) and density. CO 2 enrichment was found to stimulate biomass production, whatever the N‐supply. This stimulation was transient on low N‐supply and persisted throughout the whole vegetative growth only in high N‐supply. Acclimation on low N–high CO 2 was not associated with carbohydrate accumulation or with a strong reduction in Rubisco amount or activity. At high N‐supply, growth stimulation by high CO 2 was mainly because of the acceleration of leaf production and expansion while other parameters such as specific leaf area, root/shoot ratio and g s appeared to be correlated with total leaf area. Our results thus suggest that, in strictly controlled and stable growing conditions, acclimation of A. thaliana to long‐term CO 2 enrichment is mostly controlled by growth rate adjustment.