Figure 1 Negative contrast electron micrograph of particles of Faba bean necrotic yellows virus (FBNYV). The bar represents 50 nm. (Courtesy of L. Katul and D.-E. Lesemann.)
Figure 2 Genome organization of Banana bunchy top virus (BBTV), showing the 9 circular ssDNA components identified in this species. BBTV DNA-1 to 6 occur in all isolates tested, whereas BBTV S1, S2 and Y1 have been isolated only from Taiwan isolates. BBTV DNA-1 encodes a replication associated protein (major ORF) and a small transcribed ORF of unknown function; BBTV DNA-3 encodes the virus capsid protein; the functions of the proteins encoded by BBTV DNA-4, and 5 have been assigned to movement and RB-binding proteins, respectively, and those encoded by BBTV DNA-2 and -6 are unknown. BBTV S1, S2 and Y1 each encode a putative replication associated protein. (Redrawn from C. Horser and J. Dale.)
Figure 3 Neighbor-joining dendrograms illustrating amino acid sequence relationships among the four non-Rep proteins identified from all four assigned species, Banana bunchy top virus (BBTV), Faba bean necrotic yellows virus (FBNYV), Milk vetch dwarf virus (MDV), and Subterranean clover stunt virus (SCSV). The vertical order in (a) to (d) reflects decreasing identities between FBNYV and MDV as well as among all four species. Vertical branch lengths are arbitrary and horizontal distances are proportional to percent sequence differences. Sequence alignments and dendrograms were produced using DNAMAN (version 4.0 for Windows 95/98): Lynnon Biosoft, Quebec, Canada) which uses a CLUSTAL-type algorithm. The dendrograms were bootstrapped 1000 times (scores are shown at nodes) and rooted on the capsid protein sequence of Potato virus YO (U09509) used as a random sequence. (Courtesy of L. Katul and H.J. Vetten.)
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