Table 1.

Factor analysis of water-soluble metabolites in transgenic and conventional lettuce.

a. In red, amino acids. In blue, organic acids (in bold those of Krebs cycle); in black, mono-and disaccharides and other compounds.

b. C, conventional samples; K, PetE:KNAT1 samples. The increased (+) or decreased (-) level of a metabolite is indicated when found to be so for both the growth stages.

c. 4L, samples at 4th leaf stage; H, samples at the head stage. The level variation of a leaf metabolite at head stage and young phase (4L) is indicated when found identical for both transgenic and conventional plants.

d. The occurrence of interaction between leaf development and transgene action was assessed for 95% confidence interval.