Table 4. Nicotine contents of various plant organs of two hydroponically cultivated tea cultivars (Yabukita and Benifuki).

Parts	Nicotine content (μg g−1 dry weight)
	Yabukita			Benifuki
New leaves	0.003	±	0.000 a	0.008	±	0.006 A
New stems	0.01	±	0.000 b	0.01	±	0.000 A
Mature leaves	0.009	±	0.001 b	0.009	±	0.000 A
Mature stems	0.012	±	0.001 b	0.01	±	0.001 A
White roots	0.011	±	0.000 b	0.029	±	0.003 B
Lignifying roots	0.013	±	0.004 b	0.024	±	0.003 B

Data are means ± S.D. (n = 3). Different letters indicate significant differences (P < 0.05, Tukey’s). Lowercase and uppercase characters indicate significant differences among organs of Yabukita and Benifuki, respectively.