Table 4.
Ratios of GAs* to ABA-free, IAA to ABA-free, and IAA to total cytokinins (CYT) in buds, well-developed flowers, wilted flowers, and leaves of common buckwheat plants grown at 20 °C (control) and 30 °C (thermal stress).
| Strain/Cultivar | Temp. | Organ | |||
|---|---|---|---|---|---|
| Buds | Open Flowers | Wilted Flowers | Leaves | ||
| GAs/ABA-free | |||||
| PA15 | 20 | 2.77 ± 0.33 bB | 1.12 ± 1.00 cC | 1.19 ± 0.09 dC | 4.57 ± 0.51 bA |
| 30 | 3.56 ± 0.42 aC | 3.08 ± 0.27 bC | 4.44 ± 0.49 bB | 9.19 ± 1.09 aA | |
| ‘Panda’ | 20 | 2.15 ± 0.25 cB | 1.64 ± 0.15 cC | 2.69 ± 0.24 cB | 5.86 ± 0.65 bA |
| 30 | 3.77 ± 0.45 aC | 6.68 ± 0.62 aB | 6.52 ± 0.71 aB | 10.82 ± 1.18 aA | |
| IAA/ABA-free | |||||
| PA15 | 20 | 0.82 ± 0.09 bB | 1.10 ± 0.08 bB | 2.52 ± 0.28 cA | 0.22 ± 0.02 bA |
| 30 | 5.55 ± 0.66 aA | 1.56 ± 0.09 aC | 3.07 ± 0.39 bB | 0.45 ± 0.05 aD | |
| ‘Panda’ | 20 | 0.59 ± 0.07 cC | 1.08 ± 0.08 bB | 3.94 ± 0.41 aA | 0.28 ± 0.03 bD |
| 30 | 5.05 ± 0.49 aA | 1.07 ± 0.08 bD | 3.03 ± 0.29 bC | 0.41 ± 0.05 aB | |
| IAA/CYT | |||||
| PA15 | 20 | 3.29 ± 0.34 cB | 17.19 ± 1.72 aA | 19.89 ± 1.97 bA | 0.87 ± 0.08 aC |
| 30 | 18.02 ± 2.1 aA | 10.29 ± 1.08 cC | 13.94 ± 1.45 cB | 0.92 ± 0.09 aD | |
| ‘Panda’ | 20 | 2.65 ± 2.58 dC | 13.91 ± 1.35 bB | 24.77 ± 2.67 aA | 0.87 ± 0.09 aD |
| 30 | 15.75 ± 1.74 bA | 4.94 ± 0.52 dC | 6.92 ± 0.68 dB | 0.92 ± 0.09 aD | |
Values represent means (n = 3) ± SE. Different superscript letters (a, b, c, …) within each column for each parameter and organ and different capital letters within each row indicate significant differences between means of each temperature and organ (Duncan’s multiple range test; p < 0.05).* Sum of active gibberellins involved: GA1, GA3, GA4, GA5, GA6, and GA7.