The ClYVV-C capsid gene likely arose from a frame-shift mutation and has a closer affinity to other ClYVV strains and bean yellow mosaic virus than to other potyviruses.
ClYVV-C capsid characterization supports closer affinity to ClYVV/BYMV; leaves open evolutionary mechanisms and field applications in plant virology.
The sequence of 1399 nucleotides from the 3'region of the RNA of clover yellow vein potyvirus (CIYVV‐C) isolated from Calanthe sp. was determined. The capsid protein cistron was composed of 915 nucleotides, and corresponded to a region encoding 305 amino acids with a calculated Mr of 34900: the adjacent 3'non‐coding region was 74 nucleotides long. The length of the capsid protein gene of CIYVV‐C is longer, but the 3'non‐coding region is shorter than those of other CIYVV strains (CIYVV‐30.CIYVV‐NZ and CIYVV‐B). The nucleotide sequence of the capsid protein gene and the 3'non‐coding region of CIYVV‐C RNA showed significantly higher homology with those of other CIYVV strains. These data suggest that the CIYVV‐C capsid gene arose from a frame‐shift mutation of the capsid gene of another CIYVV strain. or vice versa. CIYVV‐C has a closer affinity to other CIYVV strains and to bean yellow mosaic virus than to the other potyviruses.
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Ikegami et al. (1995) studied this question.
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