Table 4.
Pearson's correlation coefficients (rp) calculated from genotypic means between stem dimensions (stem circumference and height) and stomatal traits, and carbon isotope discrimination (Δ), of the selected F1 genotypes of the D × N (deltoides × nigra, above the diagonal) and the D × T (deltoides × trichocarpa, below the diagonal) families (both 50 F1)
| Stem circumference | Stem height | Adaxial density | Abaxial density | Total density | Ratio | Adaxial length | Abaxial length | Δ | |
|---|---|---|---|---|---|---|---|---|---|
| Stem dimensions | |||||||||
| Stem circumference | – | 0·88*** | n.s. | n.s. | n.s. | n.s. | n.s. | n.s. | 0·31* |
| Stem height | 0·90*** | – | n.s. | n.s. | n.s. | n.s. | n.s. | n.s. | n.s. |
| Stomatal traits | |||||||||
| Adaxial density | n.s. | 0·40** | – | 0·63*** | 0·89*** | 0·79*** | −0·44** | −0·37** | n.s. |
| Abaxial density | 0·35* | 0·54*** | 0·69*** | – | 0·89*** | n.s. | n.s. | −0·36* | n.s. |
| Total density | 0·29* | 0·50*** | 0·84*** | 0·95*** | – | 0·46** | −0·31* | −0·42** | n.s. |
| Ratio | n.s. | −0·28* | 0·41** | −0·35* | − | −0·47*** | n.s. | n.s. | |
| Adaxial length | −0·53*** | −0·64*** | −0·49*** | −0·76*** | 0·65*** | 0·39** | − | 0·55*** | n.s. |
| Abaxial length | n.s. | n.s. | −0·45*** | −0·52*** | −0·49*** | n.s. | 0·59*** | – | n.s. |
| Δ | |||||||||
| n.s. | n.s. | n.s. | −0·30* | −0·27* | n.s. | 0·36** | n.s. | – |
Significant correlations are indicated as: *** = P ≤ 0·001; ** = P ≤ 0·01; * = P ≤ 0·05; n.s. = non-significant.