Table I.

Determination of free amino acid levels in Arabidopsis after incubation of plants with different carbon and nitrogen combinations

Treatment	Asp	Asn	Glu	Gln
	pmol mg−1 total protein
Suc	13.5  ± 0.6	288.6  ± 105.3	43.9  ± 1.3	114.4  ± 4.0
Suc + Asp	1,410.7  ± 84.5	1,575.2  ± 59.2	130.9  ± 54.3	660.0  ± 26.2
Suc + Asn	92.7  ± 26.7	7,105.2  ± 33.8	272.2  ± 14.4	731.0  ± 25.3
Suc + Glu	354.6  ± 5.8	6,809.3  ± 125.2	6,211.3  ± 63.9	2,017.0  ± 19.6
Suc + Gln	85.6  ± 10.0	1,659.4  ± 729.2	214.1  ± 27.6	2,625.4  ± 221.0

Results are means ± se (n = 3).