Table 2.
Contents of main ustilaginoidins in rice FSBs at different maturity stages.
| Part of FSB | Average weight in each FSB (mg) | Ustilginoidin content (mg/g) | |||||
|---|---|---|---|---|---|---|---|
| Ustilginoidin A (1) | Ustilginoidin G (2) | Ustilginoidin B (3) | Ustilginoidin I (4) | Ustilginoidin C (5) | Total | ||
| Early stage | |||||||
| Outer layer | Nd | nd | nd | nd | nd | nd | nd |
| Middle layer | 5.7 ± 0.4 ef | 60.4 ± 5.8 a | 5.4 ± 0.1 c | 21.9 ± 2.6 c | 3.9 ± 0.3 c | 4.1 ± 0.5 d | 95.7 ± 9.2 b |
| Inner part | 22.9 ± 1.3 d | 0.7 ± 0.1 d | 0.2 ± 0.0 d | nd | nd | nd | 0.9 ± 0.1 c |
| Glume | 4.3 ± 0.6 f | nd | nd | nd | nd | nd | nd |
| Middle stage | |||||||
| Outer layer | 14.1 ± 3.0 de | 54.7 ± 1.8 ab | 6.3 ± 0.1 b | 33.9 ± 1.2 ab | 10.1 ± 0.5 b | 12.1 ± 0.8 a | 117.1 ± 3.9 a |
| Middle layer | 38.7 ± 7.5 c | 56.0 ± 5.9 ab | 8.7 ± 0.3 a | 21.7 ± 2.2 c | 5.9 ± 0.7 c | 5.4 ± 0.5 c | 97.4 ± 8.8 b |
| Inner part | 41.6 ± 5.8 bc | 0.6 ± 0.1 d | 0.4 ± 0.1 d | nd | nd | nd | 1.0 ± 0.2 c |
| Glume | 3.3 ± 0.6 f | nd | nd | nd | nd | nd | nd |
| Late stage | |||||||
| Outer layer | 49.3 ± 3.0 ab | 44.9 ± 5.5 c | 6.0 ± 1.0 bc | 36.8 ± 3.9 a | 15.1 ± 1.9 a | 12.5 ± 1.2 a | 115.4 ± 13.5 a |
| Middle layer | 54.7 ± 12.8 a | 54.0 ± 2.1 b | 9.3 ± 0.3 a | 29.8 ± 2.5 b | 8.7 ± 2.3 b | 9.0 ± 0.2 b | 110.8 ± 6.6 a |
| Inner part | 44.1 ± 6.3 bc | 1.2 ± 0.3 d | 0.6 ± 0.1 d | nd | nd | nd | 1.8 ± 0.4 c |
| Glume | 3.2 ± 0.2 f | nd | nd | nd | nd | nd | nd |
FSB: false smut ball; Each value represents the mean of triplicate ± standard deviations. Different letters indicate significant differences among different maturity sates in each column at p ≤ 0.05. nd: not detected.