Literature
Cited:
Chetelat,
R
.
T
.
,
C
.
M
.
Rick
and
J
.
W
.
DeVema
.
1989
.
Isozyme
analysis,
chromosome
pairing,
and
fertility
of
Lycopersicon
esculentum
x
Solanum
lycopersicoides
diploid
backcross
hybrids
.
Genome
32:783
-
790
.
Farley,
J
.
D
.
,
W
.
L
.
George
and
E
.
A
.
Kerr
.
1976
.
Resistant
to
Botrytis
cinerea
.
TGC
26:7
.
Rick,
C
.
M
.
,
J
.
W
.
DeVerna,
R
.
T
.
Chetelat
and
M
.
A
.
Stevens
.
1986
.
Meiosis
in
sesquidiploid
hybrids
of
Lycopersicon
esculentum
and
Solanum
lycopersicoides
.
Proc
.
Natl
.
Acad
.
Sci
.
U
.
S
.
A
.
83:3580
-
3583
.
A
new
source
of
PVY
resistance
Green
S
.
K
.
and
P
.
Hanson
Asian
Vegetable
Research
and
Development
Center,
Shanhua
(AVRDC),
Tainan
741,
Taiwan,
R
.
O
.
C
.
A
total
of
169
Lycopersicon
accessions,
including
L
.
esculentum,
L
pimpinellifolium,
L
.
peruvianum,
L
.
glandulosum
and
L
.
hirsutum
have
been
screened
for
reaction
to
potato
virus
Y
(PVY)
of
the
AVRDC
.
A
new
source
of
resistance
to
PVY
was
identified:
AVRDC
accession
L3683
(
L
hirsutum
PI
365904)
from
Ecuador
.
Inoculation
was
done
mechanically,
at
the
2
-
3
leaf
stage
with
strain
PVY
-
0
and
plants
were
evaluated
visually
and
by
ELISA
at
14
and
42
days
after
inoculation
.
The
susceptible
check,
L
esculentum
cv
TK
70,
inoculated
at
the
same
time
was
100%
susceptible
at
14
days
after
inoculation,
whereas
240
plants
of
L3683
were
resistant
(no
symptoms,
and
ELISA
negative)
at
42
days
after
the
inoculation
.
Seeds
of
L3683
were
also
sent
to
Australia
(J
.
E
.
Thomas),
Hawaii
(J
.
Cho)
and
California
(J
.
Kao)
and
to
Thailand
(K
.
Kruapan)
for
testing
with
local
strains/isolates
.
In
all
locations,
L3683
was
resistant
.
This
is
interesting
since
the
only
other
known
PVY
resistance
source,
L
.
hirsutum
PI
247087
was
found
resistant
to
Taiwan
and
Australian
isolates,
but
susceptible
to
the
Hawaii
and
Thailand
isolate
.
F
1
plants
of
CLN
236
(
L
esculentum
)
x
L3683
were
susceptible,
suggesting
that
PVY
resistance
in
L3683
is
recessive
.
An
inheritance
study
is
underway
.
Literature
cited:
Thomas,
J
.
E
.
1981
.
Australas
Plant
Pathology,
10,
67
-
68
.
A
functional
Cf
-
4
gene
for
resistance
to
Cladosporium
fulvum
Cke
.
is
present
in
Cf
-
8
and
Cf
-
11
lines
Haanstra,
J
.
a
,
Thomas,
CA
.
b
,
Jones,
J
.
D
.
G
b
and
Lindhout,
P
.
a
a
Dept
.
Plant
Breeding,
Graduate
School
of
Experimental
Plant
Sciences,
Wageningen
Agricultural
University,
P
.
O
Box
386,
6700
AJ,
Wageningen,
The
Netherlands
b
Sainsbury
Lab
.
,
John
Innes
Centre
for
Plant
Science
Research,
Colney
lane,
Norwich
NR4
7UH,
UK
In
the
history
of
tomato
breeding
for
resistance
to
Cladosporium
fulvum
many
genes
have
been
identified
and
designated,
Cf
-
1
to
Cf
-
24
.
Lindhout
et
.
al
.
(1989)
showed
that
there
was
no
race
that
could
distinguish
between
Cf
-
4
and
Cf
-
8
.
Moreover,
it
appeared
that
these
genes
were
allelic
and
therefore
indistinguishable
(Gerlagh
et
.
al
.
,
1989)
.
One
of
.
the
ancestors
of
the
Cf
-
8
line
(Ontario
7522)
is
Vantage,
which
is
known
to
contain
Cf
-
4
from
Lycopersicon
peruvianum
(Kerr,
1980;
Bailey
&
Kerr,
1964)
.
Lindhout
et
al
.
(1989)
also
characterized
the
Cf
-
11
resistance
gene
by
differential
response
upon
inoculation
with
different
races
of
C
.
fulvum
.
Remarkably,
all
races
virulent
on
Cf
-
11
from
Ontario
7716
also
were
virulent
on
lines
containing
the
Cf
-
4
resistance
gene
.
Cf
-
11
is
the
result
of
a
dominant
mutation
in
the
Cf
-
4
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