The
rvt
gene
maps
close
to
inv
on
the
long
arm
of
chromosome
1
.
Jones,
David
A
.
and
Jones,
Jonathan
D
.
G
.
The
Sainsbury
Laboratory,
John
Innes
Centre
for
Plant
Science
Research,
Norwich
Research
Park,
Colney
Lane,
Norwich
NR4
6PD,
U
.
K
.
The
rvt
(red
vascular
tissue)
gene
has
been
suggested
to
lie
on
chromosome
1
(Kerr
1982
a,
b,
Kerr
et
al
.
1988),
but
this
has
not
been
confirmed
with
respect
to
well
mapped
markers
on
chromosome
1
.
To
test
this
location
we
crossed
LA1799
rvt
to
the
chromosome
1
tester
line
LA1186
au
scf
inv
dgt
and
examined
189
F
2
progeny
.
The
segregation
data
were
as
follows
.
The
complete
absence
of
inv
rvt
recombinants
suggests
that
rvt
is
close
to
inv
.
This
is
confirmed
by
the
occurrence
of
only
one
scf
rvt
recombinant
and
two
dgt
rvt
recombinants
which
are
wild
type
for
dgt
and
scf,
respectively,
indicating
that
scf
and
dgt
are
close
to,
but
on
opposite
sides
of
rvt
.
Analysis
of
these
data
using
the
maximum
likelihood
method
of
linkage
estimation
leads
to
the
following
map
.
This
analysis
suggests
that
rvt
is
located
between
inv
and
scf
.
However,
the
recombination
distances
for
rvt
are
based
on
an
F
2
in
repulsion
phase
and
so
are
prone
to
error
.
Therefore
the
placement
of
rvt
proximal
to
inv
should
be
considered
probable
but
tentative
.
Literature
cited:
Kerr,
E
.
A
.
1982a
.
TGC
Report
32:16
-
17
.
Kerr,
E
.
A
.
1982b
.
TGC
Report
32:18
.
Kerr,
E
.
A
.
,
Chen,
R
.
and
Harris,
W
.
1988
.
TGC
Report
38:
24
-
25
.
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