Turnip mosaic virus and the quest for durable resistance
John A. Walsh and Carol E. Jenner
Horticulture Research International, Wellesbourne, Warwick, CV35 9EF, UK
||Turnip mosaic virus (TuMV)
is a member of the genus Potyvirus (type species Potato virus Y)
in the family Potyviridae. To date, TuMV is the only potyvirus known to
infect brassicas. There are potyvirus isolates that appear serologically
similar to TuMV when tested with polyclonal antisera that do not readily
infect brassicas (Lesemann and Vetten, 1985).
||Virions are ~720×15-20 nm flexuous
rods (Fig. 1) and are composed of 95% coat protein (CP) and 5% RNA.
||TuMV has been isolated from a wide
range of crop and weed plant species. It is known to infect at least 318
species in over 43 dicot families, including Cruciferae, Compositae,
Chenopodiaceae, Leguminosae and Caryophyllaceae and
is also known to infect monocots. It has the broadest known host range in
terms of plant genera and families of any potyvirus.
||Aphid transmitted in the
non-persistent manner, by at least 89 species, including Myzus persicae
and Brevicoryne brassicae.
|Useful web site:
Fig. 1 Electron micrograph of TuMV virions
stained with methylamine
Courtesy of Colin Clay, HRI Wellesbourne.
Fig. 2 TuMV infection of wallflower
showing typical flower-breaking symptoms.
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