Fig. 6

Total content of xanthotoxin (a), bergapten (b), oxypeucedanin (c), imperatorin (d), phellopterin (e), phellopterin (f) in Baizhi taproots and lateral root harvest at three stages. Data are mean of the DW shown at Table 1 multiplied the content of each furanocoumarin at each stage’s taproot (black bars) and lateral root (gray bars). Different letters indicate statistical significance (p < 0.05) by LSD test