Figure 2.

Quantification of Suc transporter mRNA accumulation by real-time PCR analysis in constant light and StSUT1 transcript quantification in constant darkness. All three known Suc transporters from potato are expressed diurnally with distinct maxima. StSUT2 shows peak levels at the beginning of the light period, whereas StSUT1 and StSUT4 show maximal transcript accumulation at the end of the light period. Oscillation of transcript amounts is continuous even under 72 h of constant light. The amplitude of StSUT1 oscillation strongly decreases in constant darkness. Relative quantification was performed with ubiquitin as internal standard. sd is given.