Transmission characteristics and some other properties of bean yellow vein-banding virus, and its association with pea enation mosaic virus

Transmission characteristics and some other properties of bean yellow vein-banding virus, and its association with pea enation mosaic virus

Transmission characteristics and some other properties of bean yellow vein-banding virus, and its association with pea enation mosaic virus

Abstract

Bean yellow vein-banding virus (BY VBV) has been found occasionally in mixed
infection with pea enation mosaic virus (PEMV) in spring-sown field beans (Vicia
faba minor) in southern England. Glasshouse tests confirmed that, like PEMV,
BYVBV is transmissible by manual inoculation and by aphids in the persistent
manner. However, BYVBV can be transmitted by aphids only from plants that
are also infected with a helper virus, usually PEMV. Thus after separation from
PEMV by passage through Phaseolus vulgaris it was no longer aphid-transmissible.
It became aphid-transmissible again only after re-mixing in plants with PEMV or
with a substitute helper, bean leaf roll virus (BLRV). It was not transmitted by
aphids that fed sequentially on plants singly infected with PEMV and BYVBV.
Thus the interaction between BYVBV and PEMV (or BLRV) that enables BYVBV
to be transmitted by aphids seems to occur only in doubly infected plants. However,
it was not transmitted by aphids from plants doubly infected with BYVBV and
broad bean wilt virus (BBWV). BYVBV and PEMV were transmitted more
readily by Acyrthosiphon pisum than by Myzus persicae; neither virus was
transmitted by Aphis fabae.

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