New insights into geminivirus complexesfrom Vietnam and ThailandDer Naturwissenschaftlichen Fakultätder Gottfried Wilhelm Leibniz Universität Hannoverzur Erlangung des akademischen GradesDoktorin der GartenbauwissenschaftenDr. rer. hort.genehmigte Dissertation vonM.Sc. Rosana Blawidgeboren am 15.08.1975 in Brasilia, Distrito Federal, BrasilienHannover, 2008Referent: Prof. Dr. Edgar MaissKorreferentin: Priv.-Doz. Dr. Christina WegeTag der Promotion: 20.02.2008Para o amorzinho da minha vida„In short, more is not just moreit is sometimes o t h e r than less“Daniel GilbertAbstract i ABSTRACTBegomoviruses are single-stranded circular DNA viruses, which replicate in thenucleus of their host cells and are classified in monopartite or bipartite virusesdepending on their genome organization. Tomato yellow leaf curl Thailand virus–[Asian Institute of Technology] (TYLCTHV-[AIT]) is a bipartite begomovirus, whichgenome constitutes of two DNA molecules (components A and B).In the first chapter of the present work, the relationship and interactions betweenbegomoviruses occurring in Thailand and Vietnam are presented. Five DNA moleculeswere sequenced from tomato infecting begomoviruses complexes in Vietnam.