In tomatoes, fructokinase 1 (Frk 1) mRNA is expressed at a constant level during fruit development. However, fructokinase 2 (Frk 2) mRNA has a high expression level in young tomato fruit but then decreases during the later stages of fruit development.
In tomatoes, the expression patterns of fructokinase 1 (Frk 1) and fructokinase 2 (Frk 2) mRNAs show distinct developmental trajectories. While Frk 1 remains constant, Frk 2 levels peak in young fruit before decreasing.