Fig. 2.

Reverse transcriptase-polymerase chain reaction (RT-PCR) expression profiles for genes encoding catabolic pathway enzymes (PYD1–3, BAT), nucleobase transporters with high affinity for uracil (AtUPS1, AtUPS2), the de novo synthesis pathway enzyme aspartate transcarbamoylase (PYRB) and salvage enzyme uracil phosphoribosyltransferase (PYRR). Expression values for each transcript, relative to Day 2 and normalized on the basis of constitutively expressed ACT2, are indicated below each band. Arabidopsis seedlings were grown in liquid culture and harvested at the indicated number of days after germination.