Cell and plastid division are coordinated through the prereplication factor AtCDT1.
The cell division cycle involves nuclear and cytoplasmic events, namely organelle multiplication and distribution between the daughter cells. Until now, plastid and plant cell division have been considered as independent processes because they can be uncoupled. Here, down-regulation of AtCDT1a and AtCDT1b, members of the prereplication complex, is shown to alter both nuclear DNA replication and plastid division in Arabidopsis thaliana. These data constitute molecular evidence for relationships between the cell-cycle and plastid division. Moreover, the severe developmental defects observed in AtCDT1-RNA interference (RNAi) plants underline the importance of coordinated cell and organelle division for plant growth and morphogenesis.
Raynaud
Cécile
C
Institut de Biotechnologie des Plantes, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 8618, Bâtiment 630, Université Paris XI, 91405 Orsay, France. raynaud@ibp.u-psud.fr
Perennes
Claudette
C
Reuzeau
Christophe
C
Catrice
Olivier
O
Brown
Spencer
S
Bergounioux
Catherine
C
D017360:Arabidopsis / Q000166:cytology* / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D001973:Bromodeoxyuridine; D002338:Carotenoids / Q000032:analysis; D002453:Cell Cycle; D018797:Cell Cycle Proteins / Q000235:genetics / Q000378:metabolism*; D002455:Cell Division; D002467:Cell Nucleus / Q000378:metabolism; D002734:Chlorophyll / Q000032:analysis; D020868:Gene Silencing; D018515:Plant Leaves / Q000166:cytology / Q000235:genetics / Q000378:metabolism; D018087:Plastids / Q000378:metabolism*; D011485:Protein Binding; D021381:Protein Transport; D019076:Transgenes / Q000235:genetics
C502272:ARC6 protein, Arabidopsis; D029681:Arabidopsis Proteins; C493651:CDT1a protein, Arabidopsis; C493652:CDT1b protein, Arabidopsis; D018797:Cell Cycle Proteins; D002734:Chlorophyll; D002338:Carotenoids; D001973:Bromodeoxyuridine