TABLE 5.
Foundation mean performance (based on BLUEs for the PJ and PZ group means), parental mean (based on BLUEs for the PJ′ and PZ′ group means), offspring mean (BLUE for the H1 mean), mean check clones (based on BLUEs for Dagga and Cemsa), genetic gain due to heterosis increment, total genetic gain in H1 offspring population relative to 49 PJ and 31 PZ foundation clones, and a 95% confidence interval for the total genetic gain, and the calculated frequency of offspring clones that are predicted to be superior to the estimated mean of the checks, in three OFSP H1 populations evaluated at Cañete (arid Pacific coast) and Satipo (humid tropics) in Peru: WAE, wide adaptation and earliness (N = 9,881); NSSP, non-sweet sweetpotato (N = 3,742); and 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 | Foundation clones (PJ + PZ)/2 (BLUEs) |
Parental clones (PJ′ + PZ′)/2 (BLUEs) |
PJ′ × PZ′ H1 offspring (BLUE) |
Check clones (mean of BLUEs for Dagga and Cemsa) | Genetic gain due to heterosis increment (%) | Total genetic gain after one reciprocal recurrent cycle (%) | 95% CI for total genetic gain in % |
Frequency of offspring clones superior to checks/varieties to replace (%) |
| WAE (90) | RYTHA (t ha–1) | 7.8 | 13.2 | 17.0 | 18.8 | 28.5 | 118.8 | [96.4,141.2] | 31.0 |
| NCRPL | 1.04 | 1.69 | 1.89 | 1.78 | 11.8 | 82.7 | [65.3,100.0] | 55.4 | |
| FYTHA (t ha–1) | 35.8 | 41.1 | 42.1 | 49.0 | 2.5 | 17.6 | [7.2,28.0] | 20.8 | |
| HI (%) | 22.7 | 30.6 | 34.8 | 31.1 | 13.5 | 53.0 | [40.4,65.6] | 64.1 | |
| DM (%) | 26.4 | 26.2 | 26.2 | 27.4 | 0.0 | −0.9 | [−3.8,2.1] | 33.1 | |
| BC (mg 100 g–1) | 21.7 | 21.7 | 20.1 | 2.3 | −6.9 | −7.1 | [−23.3,9.2] | 94.3 | |
| WAE (120) | RYTHA (t ha–1) | 19.2 | 30.8 | 35.0 | 47.9 | 13.5 | 82.1 | [66.6,97.6] | 6.6 |
| NCRPL | 2.20 | 3.03 | 3.18 | 3.07 | 5.0 | 45.0 | [35.6,54.4] | 57.1 | |
| FYTHA (t ha–1) | 47.1 | 54.2 | 54.2 | 68.2 | 0.0 | 15.1 | [3.1,27.0] | 17.3 | |
| HI (%) | 32.8 | 41.8 | 44.4 | 43.9 | 6.1 | 35.5 | [26.5, 44.5] | 55.4 | |
| DM (%) | 28.1 | 27.6 | 27.6 | 29.5 | −0.1 | −2.0 | [−4.9, 0.9] | 25.4 | |
| BC (mg 100 g–1) | 25.3 | 25.7 | 22.7 | 2.6 | −11.7 | −10.4 | [−24.3, 3.6] | 94.4 | |
| NSSP (120) | RYTHA (t ha–1) | 12.7 | 20.8 | 29.4 | 49.0 | 41.2 | 132.4 | [113.1, 151.7] | 0.3 |
| NCRPL | 1.71 | 2.22 | 2.78 | 2.90 | 25.3 | 62.7 | [49.7, 75.7] | 38.7 | |
| FYTHA (t ha–1) | 50.6 | 55.0 | 58.1 | 88.1 | 5.6 | 14.8 | [2.7, 26.9] | 7.4 | |
| HI (%) | 24.4 | 32.0 | 35.6 | 40.5 | 11.3 | 46.0 | [36.0, 56.1] | 25.1 | |
| DM (%) | 26.6 | 25.8 | 26.4 | 27.5 | 2.3 | −0.6 | [−3.8,2.5] | 34.6 | |
| BC (mg 100 g–1) | 21.5 | 23.8 | 20.5 | 3.6 | −13.9 | −4.5 | [−19.2, 10.1] | 98.1 | |
| COSW (scale 1–9) | 5.68 | 5.67 | 5.72 | 5.93 | 0.9 | 0.7 | [−4.4, 5.8] | 80.3§ | |
| HIFE (120) | RYTHA (t ha–1) | 22.6 | 32.3 | 44.6 | 45.8 | 38.0 | 97.1 | [79.4, 114.8] | 43.3 |
| NCRPL | 2.22 | 2.89 | 3.50 | 2.63 | 21.0 | 57.8 | [46.8, 68.8] | 87.8 | |
| FYTHA (t ha–1) | 38.5 | 35.4 | 40.9 | 43.4 | 15.6 | 6.1 | [−5.0, 17.2] | 35.8 | |
| HI (%) | 37.2 | 47.5 | 53.2 | 49.1 | 12.0 | 42.8 | [35.3, 50.3] | 68.1 | |
| DM (%) | 27.7 | 24.4 | 24.0 | 30.8 | −1.7 | −13.3 | [−16.2, −10.4] | 3.0 | |
| STA (%) | 57.3 | 49.4 | 49.7 | 65.5 | 0.7 | −13.2 | [−16.8, −9.6] | 2.8 | |
| SUC (%) | 13.9 | 17.7 | 17.5 | 11.6 | −1.6 | 25.8 | [15.1,36.6] | 19.4§§ | |
| BC (mg 100 g–1) | 30.0 | 42.5 | 36.6 | 4.0 | −13.8 | 22.2 | [8.8, 35.7] | 92.4 | |
| FE (mg kg–1) | 18.2 | 21.7 | 21.7 | 13.7 | 0.2 | 19.4 | [15.0, 23.7] | 99.8 |
§Frequency of hybrids with lower sweetness taste than checks after cooking.
§§Frequency of hybrids with lower sucrose than checks in raw samples.