1887

Abstract

A South African geminivirus for which we propose the name bean yellow dwarf virus (BeYDV) has been isolated from French bean ( cv. Bonus) showing stunting, chlorosis and leaf curl symptoms. A full-length cloned copy of the viral genome produced characteristic symptoms of the disease when reintroduced into French bean by agroinoculation, and was systemically infectious in and . BeYDV resembles subgroup I gemini- viruses which infect monocotyledonous plants in having a single DNA component, two non-overlapping virion-sense (V1 and V2) and two overlapping complementary-sense (C1 and C2) coding regions, and an intron within the complementary- sense coding regions that is excised to produce a C1C2 fusion protein. It is most closely related to tobacco yellow dwarf virus from Australia, the only subgroup I geminivirus previously known to infect dicotyledonous plants, although it is sufficiently dissimilar (65 % nucleotide sequence identity) to be considered a distinct virus.

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1997-08-01
2024-04-18
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