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Caracuel, Zaira; Lozano‐Durán, Rosa; Huguet, Stéphanie; Arroyo‐Mateos, Manuel; Rodríguez‐Negrete, Edgar A; Bejarano, Eduardo R
The New phytologist, 20/May , Letnik: 194, Številka: 3Journal Article
• Geminiviruses are plant viruses with circular, single‐stranded (ss) DNA genomes that infect a wide range of species and cause important losses in agriculture. Geminiviruses do not encode their own DNA polymerase, and rely on the host cell machinery for their replication. • Here, we identify a positive effect of the curtovirus Beet curly top virus (BCTV) on the begomovirus Tomato yellow leaf curl Sardinia virus (TYLCSV) infection in Nicotiana benthamiana plants. • Our results show that this positive effect is caused by the promotion of TYLCSV replication by BCTV C2. Transcriptomic analyses of plants expressing C2 unveil an up‐regulation of cell cycle‐related genes induced on cell cycle re‐entry; experiments with two mutated versions of C2 indicate that this function resides in the N‐terminal part of C2, which is also sufficient to enhance geminiviral replication. Moreover, C2 expression promotes the replication of other geminiviral species, but not of RNA viruses. • We conclude that BCTV C2 has a novel function in the promotion of viral replication, probably by restoring the DNA replication competency of the infected cells and thus creating a favourable cell environment for viral spread. Because C2 seems to have a broad impact on the replication of geminiviruses, this mechanism might have important epidemiological implications.
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