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EM image of potato virus X particles, the bar represents 100 nm (click on image to enlarge it)
Author(s): D.-E. Lesemann
Source: ICTV reports


The old family "Flexiviridae" has been divided into the Alphaflexiviridae and the Betaflexiviridae. The Alphaflexiviridae contains viruses with flexuous and filamentous particles, 500-800 nm long and 12-13 nm in diameter. They infect plants, causing mosaic and stunting diseases, as well as fungi. They are transmitted mechanically and by insects and mites.

The genome consists of monopartite, positive sense ssRNA, between 5.5 to 9 kb large, with a 3'-polyA tail and a translation of at least some ORFs from subgenomic mRNAs. It has up to 6 open reading frames ordered from 5' to 3'.

For a review see Kreuze et al. (2020).

The following genera are currently entered under this family: