Table 2.

Enzyme activities (nmol mg prot⁻¹ min⁻¹) in roots of wild-type (Desiree WT) and transgenic potato plants (UPPa II-2) following 4 d of hypoxia (H) compared with aerated controls (C)

	Desiree WT			UPPa II-2
	C	H	C	% of WT	H	% of WT
PPase	60 ± 7	17 ± 5*	214 ± 42	356**	177 ± 6	1031**
SuSy	28 ± 3	73 ± 4*	27 ± 3	98	57 ± 5*	77**
Alkaline invertase	60 ± 4	46 ± 9	56 ± 4	95	41 ± 4	88
Acid invertase	117 ± 32	38 ± 5*	118 ± 26	101	45 ± 8*	121
UGPase	1964 ± 285	1514 ± 103*	2098 ± 262	107	1589 ± 140*	105
PGM	845 ± 29	667 ± 47*	847 ± 53	100	699 ± 60*	105
Fructokinase	50 ± 6	18 ± 6*	56 ± 10	111	15 ± 6*	84
Glucokinase	53 ± 11	46 ± 4	33 ± 4	63	25 ± 5	55**
PFK	153 ± 19	184 ± 8	156 ± 13	102	190 ± 18	103
PFP	224 ± 25	185 ± 10	215 ± 23	96	186 ± 15	100
Aldolase	110 ± 9	97 ± 9	114 ± 10	103	83 ± 9	85**
Enolase	324 ± 56	375 ± 45	311 ± 48	96	352 ± 36	94
ADH	121 ± 16	3770 ± 491*	129 ± 36	106	3378 ± 303*	90
PDC	1·7 ± 1·1	10·8 ± 1·5*	0·5 ± 0·3	31	13·1 ± 1·6*	121
LDH	36 ± 9	80 ± 14*	44 ± 9	120	82 ± 13*	103

Asterisks show significant changes between aeration and hypoxia (*) and between wild-type and transgenic plants (**) at the 5 % level (t-test). Results are means of at least 8–12 samples ± SE from four independent experiments.