Results from significance tests (Wald F-statistics, with associated significance probabilities given in parenthesis) for the interactions of the regional-level ADD, REC or HET effects with age.

The results are based on a repeated measures analysis that was conducted for each trial site (Geeveston or Weilangta) by combining breast-height diameter (DBH) data across four measurement ages (i.e. 2, 4, 9 and 13 yearsfrom field planting).ADD = net difference between the additive effects of the genes in the intra-regional ♀N♂N and ♀S♂S crosses.REC = overall reciprocal effect (confounding maternal and non-maternal reciprocal effects at the regional level).HET = total mid-parent heterosis attributed to both inter-regional ♀N♂S and♀S♂N hybrids.