Table 3.
Mean comparison of QTL classes of grain yield (kg ha−1) across BC1F3 to BC1F8 generations under reproductive-stage drought stress and irrigated non-stress control conditions in Samba Mahsuri background at IRRI, Philippines
| QTL class | QTL | 2013DS | 2013DS | 2014WS | 2015WS | 2015WS | 2016DS | 2016DS |
|---|---|---|---|---|---|---|---|---|
| NS | RS | NS | NS | RS | NS | RS | ||
| BC1F3 | BC1F3 | BC1F6 | BC1F7 | BC1F7 | BC1F8 | BC1F8 | ||
| Population size | ||||||||
| 42 | 42 | 70 | 20 | 20 | 20 | 20 | ||
| A | qDTY 2.2 | 2020 a | 1069 bc | 3405 b | 3327 b | 44 a | – | – |
| B | qDTY 4.1 | 1900 a | 894 b | 3340 b† | 4727 d† | 184 b† | 5643 b† | 33 a |
| C | qDTY2.2 + qDTY4.1 | 2916 b | 1296 c | 3270 b | 4161 c | 110 ba | 4999 a | 216 b |
| X | Parent | 2742 b | 0 a | 2137 a | 1945 a | 15 a | 4051 a | 39 a |
| Trial Mean | 2395 | 815 | 3038 | 3540 | 88 | 5198 | 96 | |
| F- value | 31.22 | 46.37 | 11.18 | 43.03 | 2.12 | 19.98 | 62.66 | |
| p-value | 0.0089 | < 0.0001 | < 0.0001 | < 0.0001 | 0.09 | < 0.0001 | < 0.0001 | |
The letter display are QTL class labels ordered by mean grain yield of QTL class. Means followed by the same letter (within a column) are not significantly different, DS dry season, WS wet season, NS non-stress, RS reproductive-stage drought stress, X recipient parent (no QTL), †Mean data of only 2 lines