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Potexvirus
Group
-
Potato
Virus
X
-
PVX - Potato virus X (PVX) Potato virus X has a helical symmetry, but unlike TMV is a flexous rod it has a length of 515 nm and is 11.2 nm wide.
The protein component consists of identical subunits (MW 22,300':'23;000) arranged in a helical manner.
The
pitch
of
the
helix
is
3.3
nm.
In
contrast
to
the
condition
in
TMV,
the
number
of
subunits
per
turn
is
an
integer
10.
PYX
is
a
hollow
cylinder
with
an
outer
diameter
of
11.2
nm
and
a
cavity
diameter
of
3
nm.
Four
or
possibly
three
nucleotides
interact
with
each
subunit.
PYX
is
also
called
potato
latent
virus,
potato
mottle
virus
or
Solanum
virus
1.
It
causes
mild
mosaic
of
potato,
the
symptoms
of
which
are
slight
or
negligible.
There
may
be
slight
dwarfing
of
the
plant
or
deformation
of
foliage.
Interveinal
mottling
or
mosaic
are
also
seen.
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