Table 1.
Effect of heat stress on the phytohormones of superior and inferior spikelets of rice at anthesis.
| Genotypes | Treatments | Spikelets Position | ZR (ng⋅g–1⋅FW) | IAA (ng⋅g–1⋅FW) | ABA (ng⋅g–1⋅FW) | GA3 (ng⋅g–1⋅FW) |
|---|---|---|---|---|---|---|
| V20 | Control | Superior | 5.72 ± 1.57a | 87.67 ± 3.98a | 84.95 ± 4.57a | 7.71 ± 0.26a |
| Inferior | 6.18 ± 0.49a | 52.79 ± 9.13b | 93.51 ± 6.00a | 6.78 ± 0.82a | ||
| Heat stress | Superior | 6.13 ± 0.20a | 17.07 ± 2.95c | 64.52 ± 6.81b | 7.86 ± 0.19a | |
| Inferior | 7.18 ± 1.88a | 45.23 ± 2.12b | 64.62 ± 7.16b | 7.15 ± 0.90a | ||
| Zhong9 | Control | Superior | 6.09 ± 1.21a | 61.68 ± 5.03a | 93.80 ± 3.58a | 8.03 ± 0.51ab |
| Inferior | 4.74 ± 0.63a | 44.20 ± 1.93b | 95.98 ± 2.16a | 5.65 ± 0.88c | ||
| Heat stress | Superior | 4.85 ± 0.62a | 40.32 ± 1.97bc | 63.43 ± 2.75b | 6.70 ± 0.58bc | |
| Inferior | 5.86 ± 1.07a | 34.49 ± 2.96c | 89.82 ± 0.78a | 9.43 ± 1.64a |
ZR, zeatin riboside; IAA, indole acetic acid; ABA, abscisic acid; GA3, gibberellins; FW, fresh weight. Different letters behind the data indicate statistically significant differences between the superior and inferior spikelets in the same cultivar (P < 0.05).