In general, both of these genes were up-regulated about 2-fold in the melatonin-
treated fruits (Fig. 1B). The enhanced expression of
lycopene synthesis genes following melatonin treatment
was consistent with increased lycopene accumulation and
colour change observed in M50-fruits. The result suggests
that melatonin may have a role in mediating lycopene
biosynthesis-related genes to alter lycopene concentration
in tomato fruit, and finally affect the colour change of
tomato fruit