Table 1.
Statistical analyses and per cent difference between the control (within home population cross) and each crossing treatment (treatment - control, as % of control) for a number of fitness components of R. leptorrhynchoides including all 12 population pairs. (Positive (or negative) values represent the per cent increase (or decrease) in the crossing treatment (F1, F2, F3 and backcrosses) compared with the control. Positive (or negative) values in bold indicate significant heterosis (or outbreeding depression; LSD at α = 0.05). H is the home (local) population and F is the foreign (source) population.)
| crossing treatment |
|||||||||
|---|---|---|---|---|---|---|---|---|---|
| fitness component | F | p-value | F1 (H × F) | BC (F1 × F) | F2 (F1 × F1) | BC (F1 × H) | BC (F2 × F) | F3 (F2 × F2) | BC (F2 × H) |
| seedling survival | |||||||||
| cross type | 3.26 | 0.002 | 1.0 | 0.3 | 0.5 | −0.2 | 1.5 | 2.7 | 3.9 |
| population pair | 4.48 | <0.001 | |||||||
| cross type × population pair | 1.24 | 0.120 | |||||||
| biomass | |||||||||
| cross type | 1.95 | 0.058 | 2.1 | −0.7 | 4.4 | 2.1 | −1.0 | 0.3 | 1.0 |
| population pair | 99.60 | <0.001 | |||||||
| cross type × population pair | 0.89 | 0.698 | |||||||
| number inflorescences | |||||||||
| cross type | 1.84 | 0.076 | 8.4 | 11.9 | 11.7 | 6.1 | −5.0 | 3.0 | −0.2 |
| population pair | 31.71 | <0.001 | |||||||
| cross type × population pair | 2.18 | <0.001 | |||||||