Table 1.
Companion and phloem parenchyma cell (CC + PC) number per associated sieve element (SE) number in minor loading veins and vein density (vein length per leaf area; mm mm -2) from leaves of Italian, Col-0, and Swedish ecotypes of A. thaliana grown under different controlled temperature (°C daytime leaf temperature) and photon flux density (PFD in μmol photons m-2s-1) conditions.
| Ecotype | Growth conditions | CC + PC number/SE number | Vein density(mm mm-2) | |
|---|---|---|---|---|
| Temperature (°C) | PFD (μmol photons m-2s-1) | |||
| Italian | 25 | 400 | 3.1 ± 0.07ab | 2.84 ± 0.07 n.s. |
| 25 | 1000 | 2.97 ± 0.07ab | 2.76 ± 0.31 n.s. | |
| 14 | 400 | 3.11 ± 0.03ab | 2.73 ± 0.29 n.s. | |
| 14 | 1000 | 2.97 ± 0.08ab | 2.93 ± 0.19 n.s. | |
| Col-0 | 25 | 400 | 3.15 ± 0.11ab | 2.88 ± 0.26 n.s. |
| 25 | 1000 | 3.07 ± 0.04ab | 2.95 ± 0.13 n.s. | |
| 14 | 400 | 3.25 ± 0.03a | 2.45 ± 0.19 n.s. | |
| 14 | 1000 | 3.11 ± 0.04ab | 2.74 ± 0.18 n.s. | |
| Swedish | 25 | 400 | 3.00 ± 0.05ab | 2.65 ± 0.19 n.s. |
| 25 | 1000 | 2.83 ± 0.10b | 2.91 ± 0.28 n.s. | |
| 14 | 400 | 3.14 ± 0.07ab | 2.60 ± 0.23 n.s. | |
| 14 | 1000 | 2.88 ± 0.03b | 2.94 ± 0.32 n.s. | |
Mean ± standard error of the mean (n = 4 plants). Statistically significant differences indicated with lower case letters (P < 0.05), n.s., not statistically different.