Table IV.
Concentrations of pyridine nucleotides and ATP (nmol g−1 fresh wt) in root tips from Fe-sufficient and Fe-deficient sugar beet
| +Fe (0–10 mm) | −Fe
|
−Fe YZ/+Fe | −Fe WZ/+Fe | ||
|---|---|---|---|---|---|
| YZ | WZ | ||||
| NAD+ | 0.80 ± 0.47 | 6.42 ± 0.17 | 1.91 ± 0.01 | 8.0 | 2.4 |
| NADP+ | 1.41 ± 0.92 | 6.34 ± 0.34 | 2.13 ± 0.28 | 4.5 | 1.5 |
| NADH | 1.87 ± 0.27 | 2.75 ± 0.51 | 3.23 ± 0.31 | 1.5 | 1.7 |
| NADPH | 1.70 ± 0.09 | 3.73 ± 1.18 | 2.58 ± 0.44 | 2.2 | 1.5 |
| Total pool | 5.78 | 19.24 | 9.85 | 3.3 | 1.7 |
| NADH/NAD+ | 2.3 | 0.4 | 1.7 | 0.2 | 0.7 |
| NADPH/NADP+ | 1.2 | 0.6 | 1.2 | 0.5 | 1.0 |
| ATP (×10−3) | 0.25 ± 0.03 | 1.26 ± 0.37 | 0.64 ± 0.13 | 5.0 | 2.6 |
Data are the mean ± se of seven replications. In the control roots no differences were found between pyridine nucleotide concentrations in the 0 to 5 mm and 5 to 10 mm fractions (data not shown). Because of this reason, only mean values corresponding to the root 0 to 10 mm section from the apex are given.