Table IV.
Relative contents of Al and selected mineral nutrients in cell walls and vacuoles of maize root-tip cells (transverse sections 3 mm from apex)
| Treatment | Relative Contents
|
||||||
|---|---|---|---|---|---|---|---|
| Al | Si | P | S | K | Ca | Mg | |
| μm Al | counts s−1 | ||||||
| Cell Wall | |||||||
| 0 | NDa | 8.0 ± 2.0 (6.6–13) | 19 ± 12 (7.8–26) | 14 ± 3 (ND–19) | 45 ± 22 (14–79) | 5.4 ± 1.5 (3.3–8.2) | ND |
| 20 | ND | 9.9 ± 5.0 (5.2–14) | 29 ± 10 (12–50) | 15 ± 2 (13–19) | 55 ± 21 (15–82) | 6.6 ± 2.8 (3.0–12) | 1.0 ± 0.4 (ND–1.2) |
| Vacuole | |||||||
| 0 | 24 ± 16 (ND–52) | 12 ± 1 (ND–13) | 61 ± 32 (ND–120) | 11 ± 4 (ND–16) | 74 ± 43 (13–148) | 9.9 ± 8.8 (4.4–27) | 2.5 ± 0.2 (ND–1.2) |
| 20b | 6.9 ± 1.8 (ND–9.6) | 7.5 ± 1.9 (ND–9.7) | 68 ± 65 (23–130) | 13 ± 4.6 (6.3–24) | 52 ± 19 (27–77) | 4.1 ± 1.8 (1.1–7.1) | 6.5 ± 5.0 (ND–9.6) |
| 20c | 119 ± 43 (46–173) | 193 ± 55 (120–229) | 10 ± 1 (ND–11) | 32 ± 9 (21–44) | 73 ± 18 (46–97) | 11 ± 3 (8.6–15) | 6.4 ± 3.4 (0.6–12) |
Plants were exposed for 24 h to nutrient solutions with 0 (control) or 20 μm Al. All data are from freeze-substituted samples. Values are given as ranges (parentheses) and means ± sd; n ≥ 9 for control and n ≥ 15 for Al-treated plants.
a
ND, Not detected.
b
Element composition of P-rich vacuolar deposits.
c
Element composition of Si-rich vacuolar deposits.