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Further changes in the cotton leaf curl disease complex: an indication of things to come?

Virus Genes 2017 December
Cotton leaf curl disease (CLCuD) has been a problem for cotton production in Pakistan and India since the early 1990s. The disease is caused by begomoviruses associated with a specific satellite, the cotton leaf curl Multan betasatellite (CLCuMB). In 2001, resistance introduced into cotton was broken by a recombinant begomovirus, Cotton leaf curl Kokhran virus strain Burewala (CLCuKoV-Bur). Unusually, in resistant cotton, this virus lacked an intact transcriptional activator protein (TrAP) gene, with the capacity to encode only 35 of the usual ~134 amino acids. Recently, isolates of CLCuKoV-Bur with a longer, but still truncated, TrAP gene have been identified in cotton breeding lines lacking the earlier resistance. This suggests that more pathogenic viruses with a full TrAP could return to cotton if the earlier resistance is not maintained in ongoing breeding efforts to produce CLCuD-resistant cotton varieties. This conclusion is supported by recent studies showing the reappearance of pre-resistance-breaking begomoviruses, with full-length TrAP genes, in cotton.

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