Overexpression of RPOTmp Being Targeted to Either Mitochondria or Chloroplasts in Leads to Overall Transcriptome Changes and Faster Growth.

The transcription of organellar genes is performed by three nuclear-encoded RNA polymerases: RPOTm, RPOTmp, and RPOTp. The RPOTmp protein possesses ambiguous transit peptides, allowing participation in gene expression control in both mitochondria and chloroplasts, although its function in plastids is still under discussion. Here, we show that the overexpression of RPOTmp in , targeted either to mitochondria or chloroplasts, disturbs the dormant seed state, and it causes the following effects: earlier germination, decreased ABA sensitivity, faster seedling growth, and earlier flowering.

Short Interrupted Repeat Cassette (SIRC)-Novel Type of Repetitive DNA Element Found in .

Short interrupted repeat cassette (SIRC)-a novel DNA element found throughout the nuclear genome. SIRCs are represented by short direct repeats interrupted by diverse DNA sequences. The maxima of SIRC's distribution are located within pericentromeric regions.