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Background  Geminiviruses are single-stranded DNA viruses that cause serious crop losses worldwide. Successful infection by these pathogens depends extensively on virus-host intermolecular interactions that allow them to express their gene products, to replicate their genomes and to move to adjacent cells and throughout the plant.    Results  To identify host genes that show an altered regulation in response to  Cabbage leaf curl virus  (CaLCuV) infection, a screening of transposant  Arabidopsis thaliana  lines was carried out. Several genes were identified to be virus responsive and one,  Crumpled leaf  ( CRL)  gene, was selected for further characterization.  CRL  was previously reported by Asano et al., (2004) to affect the morphogenesis of all plant organs and the division of plastids. We report here that  CRL  expression, during CaLCuV infection, shows a short but strong induction at an early stage (3-5 days post inoculation, dpi). To study the role of  CRL  in CaLCuV infection,  CRL  over-expressing and silenced transgenic plants were generated. We compared the replication, movement and infectivity of CaLCuV in transgenic and wild type plants.    Conclusion  Our results showed that CRL over-expressing plants showed an increased susceptibility to CaLCuV infection (as compared to wt plants) whereas  CRL -silenced plants, on the contrary, presented a reduced susceptibility to viral infection. The possible role of  CRL  in the CaLCuV infection cycle is discussed.

The infective cycle of Cabbage leaf curl virus (CaLCuV) is affected by CRUMPLED LEAF (CRL) gene in Arabidopsis thaliana