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C and N content of roots and tops of wt and starch mutants of Arabidopsis grown under different levels of nitrate and CO2. Material from three individual plants was pooled and used for analysis. Plants were grown under different levels of CO2 and N nutrition during the last 16 d of growth as follows: CLNH, growth under 35 Pa CO2, 6 mm nitrate; CLNL, growth under 35 Pa CO2, 0.2 mm nitrate; CHNH, growth under 100 Pa CO2, 6 mm nitrate; and CHNL, growth under 100 Pa CO2, 0.2 mm nitrate.
