Table 1.

Enzyme Commission (E.C.) numbers, abbreviations used, and the range of activities for glycolytic enzymes that were characterized in sugarbeet roots during 60 days storage.

Enzyme	E.C.	Abbreviation	Activity (μmol min-1 g-1)
Triose phosphate isomerase	5.3.1.1	TPI	5680 – 7190
UDP-glucose pyrophosphorylase	2.7.7.9	UDPase	275 – 489
Glucose 6-phosphate isomerase	5.3.1.9	G6PI	194 – 328
Phosphoglucomutase	5.4.2.2	PGM	92 – 113
Pyruvate kinase	2.7.1.40	PK	62 – 80
Enolase	4.2.1.11	ENO	25 – 34
Phosphoglycerate kinase	2.7.2.3	PGK	12 – 22
Aldolase	4.1.2.13	ALD	13 – 15
Phosphoglycerate mutase	2.7.5.3	PGlyM	10 – 16
ATP-dependent phosphofructokinase	2.1.7.11	PFK	4.3 – 5.6
Glyceraldehyde 3-phosphate dehydrogenase	1.2.1.12	GAPDH	3.4 – 4.3
Phosphoenolpyruvate phosphatase	3.1.3.60	PEPase	2.5 – 3.0
Hexokinase	2.7.1.1	HK	1.6 – 2.3
Fructokinase	2.7.1.4	FK	1.0 – 1.3
Pyrophosphate-dependent phosphofructokinase	2.7.1.90	PFP	0.65 – 1.0

Activities are presented as the range of activities that occurred during 60 days storage (lowest observed activity to highest observed activity), using the mean activities from samples at 0, 1, 2, 3, 4, 7, 10, 30, and 60 days after harvest. Enzymes are listed in order of decreasing mean activity, with activity expressed as the quantity of substrate consumed min^-1 g^-1 protein. Roots were stored 10 days at 10°C and 90 ± 5% relative humidity (RH), then stored at 4°C, 90 ± 5% RH for 50 days.