Figure 5.
Site-directed phosphomutants are differentially affected in plastid gene expression. Northern blot analyses were carried out with total cellular RNA (1 μg each) from the wild type (WT), the AtSig6 knock-out line (sig6-2) and the retransformed lines, including those containing fully functional AtSIG6 cDNA (sig6-com) and various point mutant derivatives. Hybridization was performed using DIG-labelled RNA probes for atpB, psbA and a nuclear control gene (actin2), with RNA from 7-day-old seedlings (7d) and 14-day-old plantlets (14d). Transcript sizes (kb) are indicated in the right margin.