Study of the Physiological Dynamics of Cadmium Accumulation in Two Varieties of Rice with Different Cadmium-Accumulating Properties
Table 3
Photosynthetic index results of cultivars at different growth stages under Cd pollution treatment.
Rice growth period
Soil treatment
YZX
XWX
Pn (μmol·m−2·s−1)
Gs (μmol·m−2·s−1)
Ci (μmolCO2·mol−1)
Tr (mmol·m−2·s−1)
Pn (μmol·m−2·s−1)
Gs (μmol·m−2·s−1)
Ci (μmolCO2·mol−1)
Tr (mmol·m−2·s−1)
Tillering stage
Cd-1
23.7 ± 0.7b(a)
1.0 ± 0.0a(a)
329.3 ± 2.1a(b)
7.7 ± 0.1c(a)
24.5 ± 0.9ab(a)
1.2 ± 0.1b(a)
333.9 ± 4.3a(a)
8.4 ± 0.3c(a)
Cd-2
26.4 ± 0.7a(a)
1.2 ± 0.0a(a)
319.4 ± 2.6b(a)
9.1 ± 0.2b(a)
25.8 ± 0.6a(b)
1.5 ± 0.1a(a)
325.8 ± 0.8 b(a)
9.0 ± 0.2b(a)
Cd-3
24.4 ± 0.6b(a)
1.1 ± 0.1a(a)
322.8 ± 3.0b(a)
10.0 ± 0.2a(a)
23.7 ± 1.2b(a)
1.4 ± 0.1ab(a)
337.1 ± 4.0a(a)
10.4 ± 0.1a(a)
Booting stage
Cd-1
20.9 ± 0.7b(b)
0.9 ± 0.1a(a)
328.6 ± 0.2a(b)
5.8 ± 0.2a(b)
23.1 ± 0.5a(b)
0.7 ± 0.2b(b)
322.6 ± 1.4a(b)
5.5 ± 0.4a(b)
Cd-2
23.7 ± 0.5a(b)
1.0 ± 0.0a(b)
315.5 ± 5.5b(ab)
6.2 ± 0.6a(c)
23.6 ± 0.1a(c)
1.1 ± 0.0a(b)
321.7 ± 6.7a(a)
5.6 ± 0.1a(c)
Cd-3
23.1 ± 0.4a(b)
0.9 ± 0.0a(a)
313.4 ± 2.0b(a)
6.5 ± 0.1a(d)
21.1 ± 0.1b(b)
1.0 ± 0.1a(b)
319.0 ± 12.6a(ab)
6.0 ± 0.1a(c)
Full heading stage
Cd-1
19.4 ± 0.1b(c)
0.6 ± 0.0b(b)
325.4 ± 6.2a(b)
4.8 ± 0.2c(c)
21.8 ± 0.1b(c)
0.6 ± 0.0b(b)
306.0 ± 5.4a(c)
4.8 ± 0.2c(c)
Cd-2
25.7 ± 0.7a(a)
0.9 ± 0.1a(b)
308.8 ± 2.8a(b)
6.6 ± 0.1b(c)
24.0 ± 0.5a(c)
0.8 ± 0.1a(c)
304.0 ± 5.0a(b)
6.7 ± 0.4 b(b)
Cd-3
17.5 ± 0.9c(c)
0.5 ± 0.2b(b)
302.6 ± 24.4a(a)
7.6 ± 0.5a(c)
19.9 ± 0.7c(b)
0.6 ± 0.1b(c)
303.5 ± 5.1a(b)
7.7 ± 0.3a(b)
Maturity stage
Cd-1
19.3 ± 0.3b(c)
0.5 ± 0.0a(b)
338.7 ± 1.0a(a)
7.6 ± 0.1c(a)
18.8 ± 0.6b(d)
0.6 ± 0.1a(b)
318.7 ± 1.5a(b)
8.8 ± 0.1b(a)
Cd-2
25.9 ± 0.7a(a)
0.5 ± 0.0a(c)
278.8 ± 6.5b(c)
8.1 ± 0.2b(b)
29.0 ± 0.3a(a)
0.6 ± 0.1a(d)
278.4 ± 15.8 b(c)
8.9 ± 0.6ab(a)
Cd-3
14.9 ± 0.3c(d)
0.4 ± 0.1b(b)
298.9 ± 19.0b(a)
9.2 ± 0.4a(b)
19.7 ± 1.1b(b)
0.5 ± 0.3a(c)
295.2 ± 24.3ab(b)
10.5 ± 1.3a(a)
Note. The data in the table are mean ± standard error. The soil difference of Cd is shown outside the brackets, while the growth period difference is shown inside the brackets. There was significant difference between the two varieties at the 0.05 level, and a significant difference at 0.01 level. Pn (Photo), photosynthesis rate; Gs, stomatal conductance (Gs); Ci, intercellular CO2 concentration; Tr (Trmmol), transpiration rate.
