Fig. 4. Expression profiles of the ULT1 and ULT2 genes. RT-PCR analysis was performed on RNA extracts from various wild type Ler tissues: roots (R), 8-day-old seedlings (S), mature rosette leaves (L), stems (St), inflorescence apices (In), pollen (P) and siliques (Si). ULT1 transcripts were amplified from all tissues examined, whereas ULT2 transcripts were detected only during the reproductive phase in inflorescences, pollen and siliques. EF1 was amplified as a control. In addition, control amplification reactions were run with each set of primers using genomic DNA (gDNA) as a template.