Table III.
Effect of leaf calcium status on the distribution of strontium between different cell types after uptake from 50 mm Sr(NO3)2 + 5 mm KCl for 4 or 24 h
| Cell Type
|
Strontium (p − b)/b
|
|||
|---|---|---|---|---|
| 4 h
|
24 h
|
|||
| High Calciuma | Low Calciumb | High Calcium | Low Calcium | |
| Adaxial epidermis | 0.017 ± 0.002c | 0.003 ± 0.002 | 0.032 ± 0.006 | 0.042 ± 0.007 |
| Palisade mesophyll | 0.089 ± 0.007 | 0.031 ± 0.005 | 0.196 ± 0.007 | 0.208 ± 0.016 |
| Spongy mesophyll | 0.061 ± 0.005 | 0.008 ± 0.003 | 0.048 ± 0.007 | 0.047 ± 0.014 |
| Abaxial epidermis | 0.006 ± 0.003 | 0.014 ± 0.004 | 0.036 ± 0.003 | 0.049 ± 0.006 |
a
From a plant grown in unamended nutrient solution.
b
From a plant grown in nutrient solution containing 50 mm KCl.
c
Data are presented as mean ± se (n = 5–10 for each cell type in a single leaf from each treatment). The lsds (at P = 0.05) were: for 4-h uptake, cell type, 0.011; age, 0.008; cell type × calcium status, 0.016; for 24-h uptake, cell type, 0.018; age, not significant; cell type × calcium status, not significant.