Table II. GPC-PDE and GPI-PDE enzyme activity in white lupin roots.

P ≤ 0.05 for treatments. Statistical significance was based on four biological replicates.

Enzyme	25% to 75% (NH4)2SO4 Cut
	−Pi Cluster Roots	+Pi Normal Roots
	nmol min−1 mg−1 protein
GPC-PDE, Ca2+	35.2 ± 4.8	10.5 ± 2.2
GPC-PDE, Mg2+	28.9 ± 3.6	6.6 ± 0.4
GPI-PDE, Ca2+	4.5 ± 0.4	0
GPI-PDE, Mg2+	3.4 ± 0.4	0