Table 2.
Mean values of assessed seedling characteristics under both growing conditions and their variation (%) due to heat stress from control of three clusters.
| Cluster | Treatment | SFW | RFW | SDW | RDW | STWC | RSR | Fv/F0 | Fv/Fm | chl a | chl b | chl T |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cluster 1 | Control | 314.78 | 57.47 | 50.36 | 16.30 | 0.837 | 0.328 | 3.315 | 0.766 | 0.795 | 0.300 | 1.251 |
| Heat | 226.79 | 36.14 | 41.79 | 15.09 | 0.809 | 0.368 | 2.763 | 0.731 | 0.691 | 0.262 | 1.089 | |
| % change | (−)27.95a | (−)37.13a | (−)17.01a | (−)7.39a | (−)3.33a | (+)12.19a | (−)16.66b | (−)4.50a | (−)13.17a | (−)12.41a | (−)12.95a | |
| Cluster 2 | Control | 316.65 | 82.13 | 51.12 | 19.99 | 0.828 | 0.392 | 2.882 | 0.730 | 0.676 | 0.309 | 1.127 |
| Heat | 98.67 | 24.67 | 36.99 | 12.24 | 0.585 | 0.337 | 2.146 | 0.670 | 0.530 | 0.246 | 0.889 | |
| % change | (−)68.84c | (−)69.96b | (−)27.63b | (−)38.78b | (−)29.25b | (−)14.01b | (−)25.56b | (−)8.28b | (−)21.58b | (−)20.30b | (−)21.17b | |
| Cluster 3 | Control | 295.11 | 87.87 | 49.51 | 22.07 | 0.827 | 0.446 | 3.769 | 0.786 | 0.756 | 0.291 | 1.197 |
| Heat | 167.35 | 26.87 | 35.57 | 12.75 | 0.772 | 0.380 | 2.939 | 0.739 | 0.440 | 0.180 | 0.708 | |
| % change | (−)43.29b | (−)69.42b | (−)28.15b | (−)42.23b | (−)6.57a | (−)14.87b | (−)22.02b | (−)6.04ab | (−)41.79c | (−)38.36c | (−)40.82c |
According to Tukey's HSD, mean % change values in a column with different superscript letter(s) are statistically different at p ≤ 0.05. The (+) and (−) signs indicate the percent increase and decrease, respectively regarding the effect of heat stress treatment over control. Details of seedling traits are presented in Fig. 1.