Table 4.
Paratracheal parenchyma cells in the stem of the grape cultivars and the alternative host species of Xylella fastidiosa
| Paratracheal parenchyma cell arrangement | Cell number/vessel element CS | Average cell number/vessel element | Cell number/strand | |
|---|---|---|---|---|
| Grapevine | ||||
| V. vinifera ‘Sylvaner’ | Scanty to vasicentric | Up to 14 | 6·5 (0·5) | Up to 10 |
| V. vinifera ‘Cabernet Sauvignon’ | Scanty to vasicentric | Up to 18 | 6·7 (0·6) | Up to 8 |
| V. vinifera ‘Pinot Noir’ | Scanty to vasicentric | Up to 15 | 6·8 (0·4) | Up to 9 |
| V. vinifera ‘Chardonnay’ | Scanty to vasicentric | Up to 13 | 6·4 (0·5) | Up to 8 |
| Movement | ||||
| I. purpurea | Scanty | Up to 5 | 2·9 (0·5) | 2–3 |
| V. major | Absent | |||
| C. sinensis | Scanty | Up to 5 | 3·0 (0·2) | 1–2 |
| P. amygdalus | Absent | |||
| H. annuus | Vasicentric | Up to18 | 13·5 (0·4) | 1–2 |
| N. sanderae | Scanty | Up to 3 | 2·1 (0·1) | 2–4 |
| Limited movement | ||||
| U. californica | Scanty | Up to 5 | 2·9 (0·2) | 2–4 |
| A. rhombifolia | Absent | |||
| D. meteloides | Scanty to vasicentric | Up to 5 | 2·7 (0·2) | 2–4 |
| E. globulus | Scanty to vasicentric | Up to 15 | 10·0 (0·4) | Up to 8 |
| A. douglasina | Scanty to vasicentric | Up to 4 | 2·6 (0·1) | 1–2 |
| C. quinoa | Scanty | Up to 4 | 2·6 (0·2) | 1–2 |
Data are mean (s.e.), n = 5 stems.
CS, cross-section.