Background: Plastids arose from a free-living cyanobacterial endosymbiont and multiply by binary division as do cyanobacteria. Plastid division involves nucleus-encoded homologs of cyanobacterial division proteins such as FtsZ, MinD, MinE, and ARC6. However, homologs of many other cyanobacterial division genes are missing in plant genomes and proteins of host eukaryotic origin, such as a dynamin-related protein, PDV1 and PDV2 are involved in the division process. Recent identification of plastid division proteins has started to elucidate the similarities and differences between plastid division and cyanobacterial cell division. To further identify new proteins that are required for plastid division, we characterized previously and newly isolated plastid division mutants of Arabidopsis thaliana.

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This report was preparatf as an aceoyftt of work sponsored by the Untteit States SoveriweRt. ieither the United Itatss ner the Entrgy Research and Oevetopient Mrainistration, nor artf of their «plopts, nor any of ttietr contractors, sul3contractors, or their employees, makes any warranty, express or itnplied, or assuMS any legal liability or responsiiii lity for the iccuracf, ccjaplelwess or asefulness of any inforaation, apparatus, proifuct er process iisclosefl, or represents that its ms would not infringe privately owed rights.

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