Table 3.

The concentrations and ratios of Ca, K, P, and ABA in xylem sap in different parts of the shoot, and the ratio of ABA to potassium (K) in phloem exudates obtained with the EDTA technique in pea plants. Further details are as described in Table 2.

	Control	V. paradoxus 5C-2
Xylem sap concentrations in internodes 1–4
Abscisic acid (ABA) (nM)	15.5±1.76	12.6±1.79
Calcium (Ca) (mM)	0.25±0.03	0.23±0.02
Potassium (K) (mM)	1.35±0.33	2.05±0.33
Phosphorus (P) (mM)	0.14±0.02	0.14±0.05
Xylem sap concentrations in internodes 5–7
Abscisic acid (ABA) (nM)	15.3±1.67	9.20±2.31
Calcium (Ca) (mM)	0.26±0.05	0.36±0.03
Potassium (K) (mM)	1.84±0.26	2.49±0.24
Phosphorus (P) (mM)	0.15±0.02	0.14±0.01
Xylem sap ratios (entire shoot)
K/Ca	6.45±0.72	8.17±0.74
P/Ca	0.60±0.07	0.52±0.12
ABA/K	10.4±1.39	6.0±1.37*
ABA/K in phloem exudates
Internodes 1–4	10.0±3.2	8.8±2.7
Internodes 5–7	12.6±4.0	12.5±2.6

Data are shown as means ±SE; n=4–8. An asterisk indicates a significant difference at the P < 0.05 level.