Table 7.
Significant (P < 0.05) R 2 values between root traits measured in the present study, and leaf traits reported in a parallel study (Mason and Donovan 2015) across populations of 26 Helianthus species and Phoebanthus tenuifolius. Directionality indicated in parentheses, with n = 52–58 as described in main text. R 2 values which became nonsignificant when outlier populations were excluded are indicated by (δ). Not significant (ns). Root trait abbreviations and units as in Table 2; leaf trait abbreviations as in the main text
| Root traits | Leaf traits assessed by Mason and Donovan (2015) | |||||
|---|---|---|---|---|---|---|
| Leaf Amass (nmol·CO2·g−1·s−1) | Leaf Rmass (nmol·CO2·g−1·s−1) | Leaf N (%) | LL (days) | Leaf P (%) | LMA (g·m−2) | |
| SRL | ns | (−)0.10 | ns | ns | ns | ns |
| RTD | ns | ns | ns | ns | ns | (−)0.17 |
| Root N | (−)0.38 | ns | (−)0.29 | (+)0.35 | (−)0.09 | ns |
| Root C:N | (+)0.43 | ns | (+)0.31 | (−)0.40 | (+)0.10 | (−)0.12 |
| Root CSA | (−)0.24 | (−)0.13 | (−)0.27 | (+)0.08 | (−)0.10 | ns |
| Xylem CSA | (+)0.14δ | ns | ns | (−)0.16 | ns | ns |
| No. Vess. | (+)0.23 | ns | (+)0.15 | (−)0.08 | ns | ns |
| Large Vess. | ns | ns | ns | (−)0.08 | ns | ns |
| Mean Vessel CSA | (+)0.08δ | ns | ns | (−)0.15 | ns | ns |
| Xylem/Root CSA | (+)0.30 | (+)0.11 | (+)0.18 | (−)0.20 | (+)0.14 | ns |
| Stele/Root CSA | (+)0.31 | (+)0.18 | (+)0.24 | (−)0.24 | (+)0.22 | ns |
| Vess./Root CSA | (+)0.29 | (+)0.12 | (+)0.28 | (−)0.11 | (+)0.10 | ns |