Table IV.

Enzyme activities in the leaves of the tomato genotypes

Enzyme activities were determined in source leaves samples from 6-week-old plants. The data presented are the mean ± se of measurements from six plants per genotype.

Enzyme Activity
Lp Aco-1
nmol min-1 g fresh wt-1
UDPGlucose pyrophosphorylase 1,043.2 ± 210.1 1,231.9 ± 176.8
Sucrose phosphate synthase (SPS) Vmaxa 1.3 ± 0.7 1.0 ± 0.2
Rubisco initial activity 4,498.3 ± 448.4 5,488.6 ± 834.1
Rubisco total activity 9745.9 ± 1619.1 10,209.8 ± 933.3
Rubisco activation state (%) 50.0 ± 12.8 54.0 ± 8.5
NADP-GAPDH 1,790.4 ± 903.7 2,603.7 ± 948.1
Transketolase 2,099.6 ± 909.2 3,003.5 ± 1,084.2
Transaldolase 39.5 ± 9.5 51.2 ± 16.4
Phosphoribulokinase 2,811.9 ± 528.9 1,911.1 ± 265.8
Pyruvate kinase 404.4 ± 196.3 276.7 ± 61.6
PFP 146.8 ± 31.4 124.9 ± 8.5
PFP 322.3 ± 40.3 332.5 ± 42.7
Phosphoglycerate kinase 9,270.9 ± 1,513.8 12,225.9 ± 802.7
ADPglucosepyrophosphaorlyase 48.5 ± 12.4 57.2 ± 3.9
Phosphogluromutave 2404.4 ± 359.1 2642.3 ± 453.5
  • a SPS values are presented as micromoles Suc per gram fresh wt per hour.