Table I. Upward growth of ARs in the dark is a conserved trait in rice.
ARs of the six rice genotypes, cv Pin Gaew 56 (PG56), Zhonghua 11 (ZH11), Taichung 65 (T65), Nipponbare, Bomba, and Kinmaze, were analyzed. Rice stem sections including the third youngest node were cut and incubated in white light with 150 μm ethephon (WL+E) or in the dark for 4 d before growth angles were determined. Angle values indicate means ± se from 15 to 30 stems analyzed in three independent experiments. Letters a and b indicate significant differences between treatments in a given variety (P < 0.05, Student’s t test).
| Cultivar | Subspecies | Ecotype | Angle |
|
|---|---|---|---|---|
| Dark | WL+E | |||
| ° | ||||
| PG56 | indica | Deepwater | 120.7 ± 0.6 a | 57.8 ± 1.2 b |
| ZH11 | japonica | Lowland | 104.6 ± 0.5 a | 60.2 ± 1.9 b |
| T65 | japonica | Lowland | 110.8 ± 0.9 a | 59.7 ± 0.9 b |
| Nipponbare | japonica | Lowland | 113.9 ± 0.9 a | 62.7 ± 1.7 b |
| Bomba | japonica | Lowland | 115.5 ± 1.2 a | 48.8 ± 1.3 b |
| Kinmaze | japonica | Lowland | 112.3 ± 1.0 a | 64.6 ± 1.2 b |