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<p><i>Millingtonia hortensis</i> is a species of medium-to-large trees with scented flowers that are grown along avenues and in parks in tropical and subtropical regions. In the present study, we report a mosaic disease of <i>M. hortensis</i> in Telangana, India, and the identification of an associated novel begomovirus, which we have tentatively named "Millingtonia mosaic virus" (MilMV). The monopartite genome of MilMV is 2,743 nt long and contains nine ORFs – three in the viral sense strand (V1-V3) and six in the antisense strand (C1-C6). Genome sequence comparisons revealed that this virus is most similar (89.2% sequence identity) to an isolate of chilli leaf curl India virus (ChiLCINV). This sequence identity value is below the species demarcation threshold for the genus <i>Begomovirus</i>. Phylogenetic analysis showed that MilMV belongs to a distinct subclade that also includes ChiLCINV. Recombination analysis identified a putative recombination event in the genome involving a papaya leaf curl virus isolate as the minor parent. The study provides a basis for further studies investigating the transmission and biological properties of MilMV.</p>

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A novel begomovirus associated with mosaic disease of Millingtonia hortensis in India

  • 期刊论文

  • 发表日期：

    2025年11月8日

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  • Damini Diksha,
  • V. Kavi Sidharthan,
  • V. K. Baranwal

摘要

Millingtonia hortensis is a species of medium-to-large trees with scented flowers that are grown along avenues and in parks in tropical and subtropical regions. In the present study, we report a mosaic disease of M. hortensis in Telangana, India, and the identification of an associated novel begomovirus, which we have tentatively named "Millingtonia mosaic virus" (MilMV). The monopartite genome of MilMV is 2,743 nt long and contains nine ORFs – three in the viral sense strand (V1-V3) and six in the antisense strand (C1-C6). Genome sequence comparisons revealed that this virus is most similar (89.2% sequence identity) to an isolate of chilli leaf curl India virus (ChiLCINV). This sequence identity value is below the species demarcation threshold for the genus Begomovirus. Phylogenetic analysis showed that MilMV belongs to a distinct subclade that also includes ChiLCINV. Recombination analysis identified a putative recombination event in the genome involving a papaya leaf curl virus isolate as the minor parent. The study provides a basis for further studies investigating the transmission and biological properties of MilMV.