Fig. 3. Mutations in MYB3R1 and MYB3R4 genes affect the abundance of G2/M phase-specific transcripts. (A) Relative transcript levels of genes associated with cell-cycle regulation and cytokinesis in the myb3r1 myb3r4 plants. G2/M phase-specific genes that contain MSA elements are indicated by the black bar. (B) Relative transcript levels of KN and CYCB2;1 genes in plants with various allele combinations of MYB3R1 and MYB3R4: +/+, homozygous for wild-type allele; +/-, heterozygous; -/-, homozygous for mutant allele. All measurements in A and B were performed on inflorescences containing young flower buds. Expression levels were determined by real-time quantitative RT-PCR and normalized relative to those in wild-type plants. Columns represent mean values; error bars represent s.d.