Table 5 Effects of CO2 concentrations on soluble sugars and starch concentrations of soybean
Non-structural carbohydrate (mg · g−1) | CO2 concentrations (ppm) | p value | |||||||
|---|---|---|---|---|---|---|---|---|---|
400 | 600 | 800 | 1000 | 1200 | 1400 | 1600 | |||
Root | Soluble sugar | 58.4 ± 5.0(bc) | 96.9 ± 5.7(a) | 61.2 ± 5.3(b) | 40.1 ± 2.5(d) | 63.4 ± 2.0(b) | 65.2 ± 3.3(b) | 52.1 ± 5.0(c) | p < 0.001 |
Starch | 26.8 ± 3.3(a) | 17.2 ± 9.6(b) | 25.6 ± 2.3(a) | 18.1 ± 2.3(b) | 18.4 ± 1.1(b) | 20.16 ± 0.96(ab) | 13.3 ± 1.5(b) | p = 0.014 | |
TNC | 85.3 ± 7.8(b) | 114.1 ± 14.8(a) | 86.8 ± 6.5(b) | 58.1 ± 2.6(c) | 81.8 ± 3.0(b) | 85.4 ± 3.9(b) | 65.4 ± 6.5(c) | p < 0.001 | |
Stem | Soluble sugar | 51.1 ± 6.4(a) | 59.7 ± 4.9(a) | 55.8 ± 4.3(a) | 64.5 ± 7.4(a) | 54.2 ± 3.5(a) | 47.2 ± 1.2(a) | 53.3 ± 5.1(a) | p > 0.05 |
Starch | 16.2 ± 5.8(bc) | 20.2 ± 2.7(ab) | 20.2 ± 4.1(ab) | 11.7 ± 0.3(c) | 23.2 ± 4.1(a) | 16.2 ± 0.7(bc) | 10.9 ± 3.9(c) | p < 0.007 | |
TNC | 67.3 ± 8.3(a) | 79.9 ± 7.5(a) | 75.9 ± 4.7(a) | 76.2 ± 7.6(a) | 77.4 ± 3.6(a) | 63.4 ± 1.7(a) | 64.2 ± 8.7(a) | p > 0.05 | |
Leaf | Soluble sugar | 65.5 ± 3.9(a) | 30.5 ± 5.0(b) | 72.6 ± 13.8(a) | 59.0 ± 13.3(a) | 27.4 ± 1.7(b) | 29.7 ± 7.6(b) | 22.6 ± 2.7(b) | p < 0.001 |
Starch | 17.9 ± 7.8(c) | 26.0 ± 5.3(ab) | 14.9 ± 2.0(c) | 27.5 ± 4.4(a) | 16.9 ± 5.0(c) | 15.8 ± 1.7(c) | 19.4 ± 1.9(bc) | p = 0.022 | |
TNC | 83.4 ± 7.1(a) | 56.5 ± 1.5(b) | 87.5 ± 15.5(a) | 86.5 ± 9.5(a) | 44.3 ± 6.4(b) | 45.5 ± 5.9(b) | 42.0 ± 3.3(b) | p < 0.001 | |
Total | Soluble sugar | 182 ± 3(abc) | 196 ± 27(ab) | 212 ± 41 (a) | 164 ± 11(bcd) | 145 ± 30(cd) | 142 ± 10(d) | 128 ± 9(d) | p = 0.004 |
Starch | 61.0 ± 11.3(a) | 63.4 ± 10.4(a) | 60.7 ± 4.4(a) | 57.3 ± 6.5(a) | 58.5 ± 8.2(a) | 52.2 ± 2.4(ab) | 43.5 ± 6.4(b) | p < 0.001 | |
TNC | 236 ± 7(ab) | 250 ± 19(a) | 250 ± 16(a) | 221 ± 5(bc) | 203 ± 27(c) | 194 ± 8(cd) | 171 ± 15(d) | p > 0.05 | |