Table 1.
Effects of various concentrations of 2,4-D on mitotic index and different stages of mitotic phase in the root tips of A. cepa
| Concentrations (mg/L) | MI ± SE | Mitotic phases (%) | |||
|---|---|---|---|---|---|
| Prophase | Metaphase | Anaphase | Telophase | ||
| 24 h | |||||
| Control | 8.01 ± 0.27 | 36.70 | 35.95 | 13.11 | 14.23 |
| 0.67 | 9.11 ± 0.82** | 45.53 | 29.68 | 8.36 | 16.43 |
| 1.34 | 10.7 ± 0.31** | 42.75 | 33.74 | 8.73 | 14.78 |
| 2.01 | 9.84 ± 0.29** | 45.22 | 29.58 | 8.33 | 16.87 |
| 2.68 | 7.57 ± 0.26* | 47.82 | 30.12 | 7.13 | 14.93 |
| 3.35 | 4.62 ± 0.20*** | 52.94 | 32.65 | 4.12 | 10.29 |
| 4.02 | 3.93 ± 0.19*** | 56.99 | 23.66 | 6.37 | 12.98 |
| 48 h | |||||
| Control | 4.81 ± 0.21 | 47.33 | 19.14 | 11.31 | 22.22 |
| 0.67 | 5.28 ± 0.22 | 50.35 | 20.96 | 13.40 | 15.29 |
| 1.34 | 9.07 ± 0.28*** | 63.78 | 17.61 | 7.07 | 11.54 |
| 2.01 | 7.15 ± 0.26*** | 64.72 | 14.55 | 5.85 | 14.88 |
| 2.68 | 6.65 ± 0.25*** | 71.60 | 13.43 | 5.87 | 9.10 |
| 3.35 | 7.11 ± 0.26*** | 63.43 | 19.13 | 5.06 | 12.38 |
| 4.02 | 3.10 ± 0.17* | 63.87 | 18.06 | 6.13 | 11.94 |
* Significantly different from the control P < 0.05 (z test)
** Significantly different from the control P < 0.01 (z test)
*** Significantly different from the control P < 0.001 (z test)