Table 2. Fitted equations of Cd concentration and the inhibition rate of root or shoot biomass.

Cultivar	Fit equations between Cd concentration and inhibition rate of root biomass	IC50 (μM)	IC90 (μM)	R2	Fit equations between Cd concentration and inhibition rate of shoot biomass	IC50 (μM)	IC90 (μM)	R2
IdyII	y = −0.0049x2 + 1.1198x −3.612	68.27	192.03	0.991**	y = −0.006x2 + 0.9837x −1.2897	124.73	174.14	0.989**
Harukaze	y = −0.01x2 + 1.7983x −0.8778	35.17	121.58	0.994**	y = −0.009x2 + 1.4841x + 6.4125	38.23	132.34	0.967**

Notes:

x is Cd concentration, and y is inhabitation of root or shoot biomass. IC₅₀ indicates an effective Cd concentration (when the root or shoot biomass decreased by 50% compared with the control), and IC₉₀ indicates a lethal concentration (when the root or shoot biomass decreased by 90% compared with the control).

^**Indicates P < 0.01.