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Article Abstract
Baculoviruses are highly host specific, and their host range is usually restricted to a single or a few closely related insect species, except for few virus species, e.g. and . In this study, two new alphabaculovirus isolates were isolated from the larvae of and , which were named as Mamestra brassicae multiple nucleopolyhedrovirus isolate QD (MbMNPV-QD) and Mythimna separata multiple nucleopolyhedrovirus isolate Hb (MyseMNPV-Hb), respectively. The Kimura two-parameter values based on the concatenated 38 core genes of baculovirus revealed that MbMNPV (isolates QD/CHb1/K1/CTa), MyseMNPV-Hb, Helicoverpa armigera multiple nucleopolyhedrovirus (HearMNPV) and Mamestra configurata nucleopolyhedrovirus B (MacoNPV-B) were different isolates of a same virus species. A phylogenetic tree of baculoviruses and nudiviruses constructed from their 20 homologous gene sequences, and that of their isolated hosts constructed from 13 protein-coding genes of the insect mitochondrial genomes, were used to analyse the coevolution of baculoviruses with their isolated hosts. The results showed that was the most likely ancestral host of these virus isolates, included MbMNPV isolates, MyseMNPV-Hb, HearMNPV, and MacoNPV-B. Therefore, we concluded that these virus isolates belong to the existing virus species - with as their ancestral host.
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