Table 7.
The effect of the nitrogen level on the boll shell glutamic-pyruvic transaminase (GPT) and glutamic-oxalacetic transaminase (GOT) activities of the two Bt cotton cultivars in 2015.
| Cultivar | N rate (kg/ha) | GPT activity (μmol g−1 FW h−1) | GOT activity (μmol g−1 FW h−1) | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 10DAF | 20DAF | 30 DAF | 40 DAF | 10DAF | 20DAF | 30DAF | 40DAF | ||
| SK-1 | 0(CK) | 11.25a | 13.13a | 13.35a | 14.47a | 16.75a | 15.64a | 17.12a | 16.59a |
| 75 | 10.83a | 12.48ab | 13.39a | 13.63b | 13.65bc | 14.73bc | 17.09a | 16.39ab | |
| 150 | 10.57a | 11.44cd | 12.24b | 12.75cb | 11.26d | 14.14cd | 15.62b | 15.43c | |
| 225 | 9.35b | 9.62e | 10.28c | 10.87d | 10.19e | 11.61ef | 13.64d | 14.17d | |
| 300 | 8.47cd | 8.52f | 9.42d | 9.97e | 8.27f | 10.01h | 12.30ef | 12.94e | |
| SK-3 | 0(CK) | 9.67b | 12.54ab | 13.76a | 14.74a | 14.11b | 15.15ab | 15.34b | 16.60a |
| 75 | 9.10bc | 12.14bc | 13.33a | 14.05ab | 13.07c | 13.59d | 14.48c | 16.05b | |
| 150 | 8.50cd | 10.90d | 12.34b | 12.49c | 11.18d | 12.44e | 13.67d | 15.64c | |
| 225 | 8.11d | 9.33e | 10.15c | 10.73de | 10.20e | 11.37fg | 12.62e | 14.01d | |
| 300 | 7.01e | 8.48f | 9.20d | 10.20de | 8.54f | 10.53gh | 11.68f | 12.52f | |
Symbol SK-1 and SK-3 are cultivar Sikang1 and Sikang3 respectively, CK is Control. DAF is acronym of “days after flowering.” Same letter among treatments within each sampling date represent non-significant difference (LSD test at 0.05 significance level).