Table 2.

Drought stress-induced changes in content of theanine and other free amino acids (mg·g⁻¹ DW).

Amino acid	Treatment time (d)
	0	2	5
The	30.168 ± 0.471a	28.017 ± 0.411b	23.989 ± 0.411c
Asp	1.238 ± 0.007b	1.224 ± 0.009b	1.259 ± 0.006a
Thr	0.627 ± 0.003a	0.618 ± 0.005b	0.626 ± 0.002a
Ser	0.684 ± 0.003b	0.690 ± 0.009ab	0.698 ± 0.003a
Glu	1.711 ± 0.009a	1.638 ± 0.019b	1.564 ± 0.010c
Gly	0.771 ± 0.007a	0.735 ± 0.006b	0.717 ± 0.005c
Ala	0.776 ± 0.006a	0.757 ± 0.006b	0.783 ± 0.005a
Cys	0.136 ± 0.004a	0.134 ± 0.002a	0.139 ± 0.003a
Val	0.763 ± 0.004ab	0.755 ± 0.004b	0.765 ± 0.006a
Met	0.162 ± 0.001a	0.153 ± 0.004b	0.153 ± 0.003b
Ile	0.597 ± 0.003ab	0.591 ± 0.003b	0.602 ± 0.004a
Leu	1.203 ± 0.004a	1.176 ± 0.006c	1.188 ± 0.006b
Tyr	0.397 ± 0.007a	0.391 ± 0.007a	0.395 ± 0.006a
Phe	0.777 ± 0.001a	0.758 ± 0.008b	0.743 ± 0.005c
Lys	0.996 ± 0.007a	0.991 ± 0.006ab	0.981 ± 0.005b
His	0.322 ± 0.001a	0.322 ± 0.002a	0.323 ± 0.003a
Arg	0.705 ± 0.006a	0.691 ± 0.006b	0.693 ± 0.005b
Pro	0.649 ± 0.003c	0.740 ± 0.005b	0.853 ± 0.009b

Values are presented as the mean ± SD from three independent experiments, and different letters indicate significant differences at P < 0.05 according to Duncan's test.