Table 5.
Magnitude of predicted dimensional and energetic effects on PTGRs of polyploid species
| Betula | Actual 1x | Actual 3x | Difference 3x – 1x | Predicted 3x | Dimensional effect (%) | Energetic effect (%) |
|---|---|---|---|---|---|---|
| W A (μm2) | 3.63 | 4.10 | +0.47 | |||
| WPR (μm3 h−1) | 34.46 | 38.69 | +4.23 | |||
| PTGR (μm h−1) | 9.95 | 8.95 | −1.00 | 8.405 | −1.545 (−15.5 %) | +0.545 (+5.5 %) |
| Handroanthus | Actual 1x | Actual 2x | Difference 2x – 1x | Predicted 2x | Dimensional effect | Energetic effect |
| W A (μm2) | 5.248 | 5.680 | +0.432 | |||
| WPR (μm3 h−1) | 9.011 | 6.273 | −2.738 | |||
| PTGR (μm h−1) | 1.717 | 1.104 | −0.613 | 1.586 | −0.131 (−7.6 %) | −0.482 (−28.1 %) |
| Handroanthus | Actual 1x | Actual 3x | Difference 3x – 1x | Predicted 3x | Dimensional effect | Energetic effect |
| W A (μm2) | 5.248 | 6.545 | +1.297 | |||
| WPR (μm3 h−1) | 9.011 | 10.585 | +1.574 | |||
| PTGR (μm h−1) | 1.717 | 1.617 | −0.100 | 1.378 | −0.339 (−19.7 %) | +0.239 (+13.9 %) |
The proximal effects occur via changes in wall area, WA, and wall production rate, WPR, respectively. The effects of each on PTGR are based on the differences between actual and predicted PTGRs of species with 1x, 2x or 3x pollen tubes. Effect size is percentage of 1x PTGR. Handroanthus values are ×103.