TABLE 3.
Estimations of offspring mean (BLUE for the H1 mean) and mid-parent (MP) mean ((PJ’ + PZ’)/2 based on BLUEs for the PJ’ and PZ’ group means) with average heterosis increment in H1 offspring, p-value of t-test statistic for heterosis increment = 0, and PJ’ × PZ’ heterosis increment in % across experimental sites for observed traits in three OFSP H1 populations: WAE, wide adaptation and earliness (N = 9,881); NSSP, non-sweet sweetpotato (N = 3,742); HIFE, high iron (N = 3,292); RYTHA, storage root yield; NCRPL, number of commercial roots per plant; FYTHA, foliage yield; HI, harvest index; DM, root dry matter; BC, β-carotene; COSW, sweetness taste after cooking; STA, root starch; SUC, root sucrose; FE, root iron.
| OFSP H1 population (harvest day) |
Trait | PJ′ × PZ′ H1 offspring (BLUE) |
Parental clones (PJ′ + PZ′)/2 (BLUEs) |
Average H1 offspring heterosis increment |
Heterosis increment = 0 p-value | t| |
Average H1 heterosis increment in % |
95% CI for average H1 heterosis increment in % |
| WAE (90) | RYTHA (t ha–1) | 17.0 | 13.2 | 3.76 | <0.001 | 28.5 | [15.8, 41.1] |
| NCRPL | 1.89 | 1.69 | 0.200 | 0.023 | 11.8 | [1.6, 22.0] | |
| FYTHA (t ha–1) | 42.1 | 41.1 | 1.03 | 0.575 | 2.5 | [−6.3, 11.3] | |
| HI (%) | 34.8 | 30.6 | 4.14 | 0.003 | 13.5 | [4.5, 22.5] | |
| DM (%) | 26.2 | 26.2 | 0.01 | 0.973 | 0.0 | [−2.8, 2.9] | |
| BC (mg 100 g–1) | 20.1 | 21.7 | −1.50 | 0.381 | −6.9 | [−22.5, 8.6] | |
| WAE (120) | RYTHA (t ha–1) | 35.0 | 30.8 | 4.17 | 0.004 | 13.5 | [4.2, 22.8] |
| NCRPL | 3.18 | 3.03 | 0.153 | 0.132 | 5.0 | [−1.5, 11.6] | |
| FYTHA (t ha–1) | 54.2 | 54.2 | 0.02 | 0.994 | 0.0 | [−10.0, 10.0] | |
| HI (%) | 44.4 | 41.8 | 2.56 | 0.076 | 6.1 | [−0.6, 12.9] | |
| DM (%) | 27.6 | 27.6 | −0.03 | 0.930 | −0.1 | [−2.9, 2.7] | |
| BC (mg 100 g–1) | 22.7 | 25.7 | −3.00 | 0.084 | −11.7 | [−24.9, 1.6] | |
| NSSP (120) | RYTHA (t ha–1) | 29.4 | 20.8 | 8.58 | <0.001 | 41.2 | [27.3, 55.1] |
| NCRPL | 2.78 | 2.22 | 0.56 | <0.001 | 25.3 | [13.4, 37.1] | |
| FYTHA (t ha–1) | 58.1 | 55.0 | 3.07 | 0.410 | 5.6 | [−7.7, 18.8] | |
| HI (%) | 35.6 | 32.0 | 3.61 | 0.015 | 11.3 | [2.2, 20.4] | |
| DM (%) | 26.4 | 25.8 | 0.59 | 0.237 | 2.3 | [−1.5, 6.1] | |
| BC (mg 100 g–1) | 20.5 | 23.8 | −3.32 | 0.065 | −13.9 | [−28.7, 0.9] | |
| COSW (scale 1–9) | 5.72 | 5.67 | 0.049 | 0.753 | 0.9 | [−4.5, 6.2] | |
| HIFE (120) | RYTHA (t ha–1) | 44.6 | 32.3 | 12.27 | <0.001 | 38.0 | [23.6, 52.3] |
| NCRPL | 3.50 | 2.89 | 0.606 | <0.001 | 21.0 | [11.2, 30.7] | |
| FYTHA (t ha–1) | 40.9 | 35.4 | 5.52 | 0.029 | 15.6 | [1.6, 29.6] | |
| HI (%) | 53.2 | 47.5 | 5.70 | <0.001 | 12.0 | [5.2, 18.8] | |
| DM (%) | 24.0 | 24.4 | −0.40 | 0.393 | −1.7 | [−5.5, 2.1] | |
| STA (%) | 49.7 | 49.4 | 0.33 | 0.782 | 0.7 | [−4.1, 5.5] | |
| SUC (%) | 17.5 | 17.7 | −0.29 | 0.742 | −1.6 | [−11.4, 8.1] | |
| BC (mg 100 g–1) | 36.6 | 42.5 | −5.87 | 0.012 | −13.8 | [−24.6, −3.0] | |
| FE (mg kg–1) | 21.7 | 21.7 | 0.05 | 0.919 | 0.2 | [−4.0, 4.4] |