Table I. Amino acid content in leaves following darkening for 6 d of an individual leaf (IDL) and an entire plant (DP).

Results are means of three replicates ± se and are expressed in μmol g⁻¹ fresh weight. Dark treatments were compared with light samples by Student’s t test (*, significant at P < 0.05; ns, not significant). n/a, Not applicable.

Amino Acid	Light	DP	IDL
Ammonium	0.80 ± 0.42	0.18 ± 0.05 ns	0.54 ± 0.60 ns
Ala	0.64 ± 0.11	1.03 ± 0.17*	0.26 ± 0.04*
Arg	0.03 ± 0.06	2.44 ± 0.06*	0.33 ± 0.10*
Asn	0.34 ± 0.04	14.44 ± 1.13*	0.99 ± 0.62 ns
Asp	1.85 ± 0.20	0.85 ± 0.25*	0.22 ± 0.04*
Cys	n/a	n/a	n/a
γ-Aminobutyric acid	0.00 ± 0.00	0.36 ± 0.03*	0.17 ± 0.05*
Gln	2.11 ± 0.19	2.93 ± 0.45 ns	0.67 ± 0.27*
Glu	2.15 ± 0.07	4.40 ± 0.34*	1.86 ± 0.05*
Gly	0.27 ± 0.07	0.00 ± 0.00*	0.03 ± 0.03*
His	0.00 ± 0.00	0.85 ± 0.03*	0.05 ± 0.08 ns
Ile	0.00 ± 0.00	0.99 ± 0.17*	0.05 ± 0.05 ns
Leu	0.11 ± 0.00	0.54 ± 0.07*	0.22 ± 0.02*
Lys	0.05 ± 0.09	0.47 ± 0.05*	0.26 ± 0.03 ns
Met	n/a	n/a	n/a
Phe	0.00 ± 0.00	2.06 ± 0.08*	0.12 ± 0.02*
Pro	0.79 ± 0.38	0.06 ± 0.02 ns	0.07 ± 0.01 ns
Ser	1.30 ± 0.22	2.04 ± 0.40 ns	0.88 ± 0.15 ns
Thr	0.60 ± 0.14	1.16 ± 0.38 ns	0.37 ± 0.08 ns
Trp	0.00 ± 0.00	0.88 ± 0.02*	0.15 ± 0.04*
Tyr	0.01 ± 0.02	0.40 ± 0.04*	0.08 ± 0.01*
Val	0.10 ± 0.00	2.05 ± 0.28*	0.19 ± 0.02*
Total	11.17	38.14	7.51