While whitefly-transmitted begomoviruses are economically important constraints to tomato production in Kuwait, little is known about genomic features of these viruses from Kuwait. A begomovirus isolated from severely diseased tomatoes, collected over a two-year period in the main tomato-growing areas of Kuwait, was characterized at the molecular level. The complete genomic sequence of the begomovirus was determined, and phlylogeographic studies were conducted to better understand genetic diversity of the virus in the region. Based on genome properties and phylogenetic analysis, the begomovirus was found to be a strain of tomato yellow leaf curl virus (TYLCV). The virus genome was monopartite, as neither DNA B nor satellite DNA molecules were detected. Two isolates characterized in this study shared 97 % and 95 % nucleotide sequence identity with a previously characterized Kuwaiti isolate, TYLCV-KISR. Among TYLCV isolates with known genome sequences, the Kuwaiti isolates shared highest sequence identity (95 %) with TYLCV-Almeria (Spain). Genetic diversity and phylogenetic analysis showed that the three Kuwaiti isolates formed a distinct clade that was separate from those of known TYLCV sequences. One Kuwaiti isolate (KW 1-3) could be a novel variant of TYLCV. Two recombination events were detected in the genome sequence of KW 1-3, which appeared to be a recombinant derived from TYLCV parents from Oman and Kuwait.
Archives of Virology – Springer Journals
Published: Jul 1, 2015
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