javascript:void(0)Functional traits measurements
Four functional traits showed significant differences among cadmium treatments, including A, Chl, Fv/Fm and ILR, regardless of lineage effect (Fig. 5 ; Table 1) . Among all the six traits, Fv/Fm was significantly differed between the two lineages (P <0.01), and affected by the interaction of cadmium and lineage (Fig. 5 ; Table 1 ). For both genotypes, ILR increased rapidly with the increasing of cadmium and reached an exceptional high level at the treatment with high cadmium concentration (Fig. 5 ). Traits such as A, Chl and Fv/Fm showed significant decreases as the concentration of cadmium raised in Heze genotype but not in Panjin genotype. There were not any significant differences between two genotypes in leaf Cd content under high Cd treatment (Heze, 1.165 ± 0.849 mg/kg; Panjin, 1.875 ± 1.56 mg/kg; t-test, t= -0.687,p = 0.525).