Study of the Physiological Dynamics of Cadmium Accumulation in Two Varieties of Rice with Different Cadmium-Accumulating Properties
Table 4
Cd enrichment of rice under different soil Cd concentrations (mg/kg).
Rice growth period
Soil treatment
YZX
XWX
Roots
Stems and sheaths
Leaves
Average
Roots
Stems and sheaths
Leaves
Average
Tillering stage
Cd-1
1.03 ± 0.09b(c)[a]
0.27 ± 0.04c(b)[b]
0.07 ± 0.01c(b)[c]
0.45
0.44 ± 0.05c(b)[a]
0.18 ± 0.05c(ab)[b]
0.04 ± 0.01c(b)[c]
0.22
Cd-2
1.29 ± 0.06b(b)[a]
0.72 ± 0.06b(c)[b]
0.25 ± 0.04b(b)[c]
0.75
1.23 ± 0.01b(b)[a]
0.50 ± 0.05b(a)[b]
0.12 ± 0.02b(a)[c]
0.62
Cd-3
2.05 ± 0.22a(c)[a]
1.13 ± 0.27a(b)[b]
0.42 ± 0.01a(b)[c]
1.20
1.74 ± 0.13a(c)[a]
0.75 ± 0.04a(c)[b]
0.23 ± 0.01a(b)[c]
0.91
Average
1.46
0.71
0.25
0.80
1.14
0.48
0.13
0.58
Booting stage
Cd-1
1.54 ± 0.06c(a)[a]
0.42 ± 0.05c(a)[b]
0.11 ± 0.02c(a)[c]
0.69
0.55 ± 0.03c(a)[a]
0.20 ± 0.05c(ab)[b]
0.08 ± 0.01c(a)[c]
0.28
Cd-2
2.10 ± 0.10b(a)[a]
1.70 ± 0.09b(a)[b]
0.33 ± 0.02b(a)[c]
1.38
1.36 ± 0.06b(a)[a]
0.56 ± 0.05b(a)[b]
0.14 ± 0.01b(a)[c]
0.69
Cd-3
4.86 ± 0.17a(a)[a]
3.61 ± 0.10a(a)[b]
0.54 ± 0.02a(a)[c]
3.00
4.71 ± 0.20a(a)[a]
1.40 ± 0.05a(a)[b]
0.37 ± 0.01a(a)[c]
2.16
Average
2.83
1.91
0.33
1.69
2.21
0.72
0.20
1.04
Full heading stage
Cd-1
1.21 ± 0.06b(b)[a]
0.37 ± 0.04c(a)[b]
0.06 ± 0.01c(b)[c]
0.55
0.28 ± 0.07c(c)[a]
0.10 ± 0.04b(b)[b]
0.04 ± 0.01b(b)[b]
0.14
Cd-2
1.26 ± 0.06b(b)[a]
0.91 ± 0.06b(b)[b]
0.19 ± 0.02b(c)[c]
0.79
1.15 ± 0.02b(c)[a]
0.20 ± 0.05b(b)[b]
0.06 ± 0.01b(b)[c]
0.47
Cd-3
2.98 ± 0.19a(b)[a]
1.12 ± 0.05a(b)[b]
0.39 ± 0.02a(b)[c]
1.50
2.21 ± 0.19a(b)[a]
1.00 ± 0.08a(b)[b]
0.22 ± 0.01a(b)[c]
1.14
Average
1.82
0.80
0.21
0.94
1.22
0.43
0.11
0.58
Maturity stage
Cd-1
0.16 ± 0.03c(d)[a]
0.06 ± 0.01c(c)[b]
0.04 ± 0.01c(b)[b]
0.08
0.12 ± 0.03b(d)[a]
0.05 ± 0.02c(b)[b]
0.03 ± 0.01b(b)[b]
0.07
Cd-2
0.77 ± 0.06b(c)[a]
0.35 ± 0.06 b(d)[b]
0.14 ± 0.01b(d)[c]
0.42
0.76 ± 0.04a(d)[a]
0.18 ± 0.05b(b)[b]
0.05 ± 0.01b(b)[c]
0.33
Cd-3
2.03 ± 0.22a(c)[a]
0.62 ± 0.07a(c)[b]
0.32 ± 0.01a(c)[c]
0.99
0.99 ± 0.22a(d)[a]
0.37 ± 0.05a(d)[b]
0.18 ± 0.01a(c)[b]
0.51
Average
0.99
0.34
0.17
0.50
0.62
0.20
0.09
0.30
Note. The data in the table are mean ± standard error. Outside the brackets are the differences between different Cd treatments in the soil, inside the brackets are the differences between different growth stages, [] is the differences between different organs in rice. There was significant difference between the two varieties at the 0.05 level, and a significant difference at 0.01 level.
