Table 2.

Enzyme activities of extracts from membrane-bound fractions of immature green (IMG) and red (RD) Micro-Tom fruits. One unit of enzyme activity is defined as the number of micromoles of NADPH oxidized [for D-galacturate reductase (D-GalAR) activity] or p-nitrophenol decolourized by L-galactono-1,4- lactone, L-galactonic acid, l-gulono-1,4-lactone, and D-glucono-1,5-lactone [for aldonolactonase (Alase) activity]. Values are the mean ±SE of three independent determinations.

Substrate	IMG	RD
D-GaIAR activity
D-Galacturonic acid	22.02±0.86 a	26.18±0.88 b
Alase activity
L-Galactono-1,4-lactone	5.55±0.51 a	12.38±1.38 b
L-Galactonic acid	10.76±1.96 a	21.39±2.97 b
L-Gulono-1,4-lactone	16.19±0.89 a	15.87±1.65 a
D-Glucono-1,5-lactone	45.13±3.07 a	45.36±3.78 a

Values with different letters are significantly different according to t-test (P <0.05).