TABLE 2.
Mean values of the basic generations and parameters of the regression of the mean values on the corresponding level of heterozygosity
| Generation | SE (%) | SW (g) | PS (days) | ASI (days) | PH (cm) | GY (Mg ha−1) | KW (mg) | NK (no.) |
|---|---|---|---|---|---|---|---|---|
| B73 | 67.6 | 2.19 | 78.9 | 2.0 | 174 | 3.81 | 265 | 229 |
| H99 | 66.5a, NS | 2.41, NS | 69.9** | 2.1, NS | 93** | 2.48** | 276, NS | 143** |
| Mean | 67.0 | 2.30 | 74.4 | 2.1 | 134 | 3.15 | 271 | 186 |
| F1 | 74.4*b | 5.8** | 71.0** | 1.4, NS | 204** | 10.69** | 346** | 492** |
| Heterosis (%)c | 11 | 156 | −5 | −34 | 52 | 239 | 28 | 165 |
| F2 | 75.8 | 4.12 | 72.5 | 2.0 | 177 | 7.29 | 330 | 351 |
| BC(B) | 68.4 | 4.26 | 73.4 | 2.2 | 205 | 7.90 | 339 | 370 |
| BC(H) | 72.4 | 3.21 | 70.6 | 1.3 | 152 | 6.37 | 315 | 321 |
| Mean (BC) | 70.4 | 3.73 | 72.0 | 1.7 | 179 | 7.14 | 327 | 346 |
| Regressiond | ||||||||
| b0 | 66.9e | 2.22 | 74.2 | 2.2 | 138 | 3.29 | 281 | 191 |
| b1 | 7.3* | 3.59** | −3.4** | −0.7, NS | 70** | 7.55** | 75** | 306** |
| R2 (%) | 99.8 | 98.4 | 94.6 | 76.5 | 96.7 | 99.7 | 87.1 | 99.8 |
| b1/b0 (%) | 11 | 162 | −5 | −33 | 51 | 229 | 27 | 161 |
*
P ≤ 0.05, **P ≤ 0.01. NS, not significant.
a
Comparison between B73 and H99.
b
Comparison between the mean of the two parents and the mean of the two reciprocal F1's.
c
Heterosis: 100 × (F1 − MP)/MP, where MP is the midparent value.
d
Linear regression of the mean value of the two parents, the mean value of the two reciprocal F1's, the F2, and the mean value of the two BCs on their heterozygosity level (i.e., 0, 1, 0.5, and 0.5, respectively).
e
The mean value of the F2 was not considered in the regression analysis of SE.