Additional
sources
for
resistance
to
Crown
and
Root
Rot
disease
Stamova,
L
.
Dept
Veg
.
Crops,
Univ
.
Calif
.
Davis,
CA
95616
Fusarium
oxysporum
f
.
sp
.
radicis
-
lycopersici
(FORL)
causing
Crown
and
Root
Rot
disease
is
very
damaging
in
greenhouse
and
field
tomato
.
The
line
IRB
-
301
-
31
derived
from
a
cross
with
L
.
peruvianum
is
the
only
source
for
resistance
to
FORL
that
have
been
reported
and
used
up
to
now
(Yamakawa,
1978;
Laterrot,
1988)
.
Within
the
Fuibright
visit
of
the
author
a
number
of
Bulgarian
lines
having
different
wild
species
in
their
genetic
background
were
tested
for
resistance
to
FORL
.
Six
numbers
out
of
54
totally
screened
inbred
lines
coming
from
the
cross
Ace
x
L
.
chilense
back
-
crossed
only
once
to
the
cultivated
tomato,
as
well
as
two
lines
with
L
.
pennellii
in
their
pedigrees
were
found
to
be
in
segregation
for
resistance
to
FORL
.
Ten
lines
from
crosses
with
L
.
pimpinellifolium
and
eight
breeding
lines
with
resistance
to
other
diseases
reported
previously
(Stamova,
1990),
were
proven
again
to
be
homozygous
resistant
.
The
resistance
is
dominantly
inherited
(Stamova,
1993)
.
To
our
knowledge
this
is
the
first
report
about
resistance
top
FORL
found
in
L
.
chilense,
L
.
pennellii
and
L
.
pimpinellifolium
.
Allelic
test
between
IRS
-
301
-
31
and
some
of
the
homozygous
resistant
lines
are
under
way
.
ACKNOWLEDGMENTS
I
would
like
to
express
my
thanks
to
Prof
.
C
.
M
.
Rick,
Dr
.
A
.
Stevens
and
B
.
Gabor
for
their
cooperation
and
help
.
Literature
Cited:
Laterrot,
H
.
,
D
.
Blancard
and
Y
.
Couteaudier
.
1988
.
Les
fusarioses
de
la
tomate
.
"P
.
H
.
M
.
-
Revue
Horticole",
no
288,
juin
-
juillet
.
Stamova,
L
.
,
M
.
Yordanov
and
J
.
Stancheva
.
1990
.
New
Fusarium
on
tomatoes
in
Bulgaria
.
60
-
Anniv
.
Scient
.
Session
of
the
"Maritsa"
Veg
.
Crops
Res
.
Inst
.
,
Plovdiv,
Bulgaria
.
Stamova,
L
.
1993
.
Scope
of
the
breeding
tomato
for
disease
resistance
in
Bulgaria
.
Proceedings
of
the
Xllth
Meeting
on
Tomato
Genetics
and
Breeding,
Plovdiv,
Bulgaria,
pp
.
11
-
18
.
Jamakawa,
K
1978
.
Fusarium
wilt
Tropical
Agriculture,
sere
A,
147
-
148
.
Resistance
to
Tomato
Spotted
Wilt
Virus
Stamova,
L
.
Dept
.
Veg
.
Crops,
Univ
.
Calif
.
Davis,
CA
95616
The
Tomato
Spotted
Wilt
Virus
(TSWV)
has
become
a
big
problem
for
tomato
crops
in
many
regions
.
High
level
of
resistance
was
reported
in
L
.
peruvianum
,
the
resistance
being
controlled
by
partly
dominant
gene
Sw
-
5
(Stevens
et
al
.
,
1992)
.
The
same
authors
have
later
published
resistance
to
3
isolates
of
TSWN
found
in
20
L
.
chilense
and
8
L
.
peruvianum
accessions
(Stevens
et
al
.
,
1994)
.
In
1995
a
number
of
lines
from
the
breeding
program
for
high
D
-
carotene
tomatoes
(Manuelyan
et
al
.
,
1993)
were
tested
for
resistance
to
TSWV
.
All
numbers
under
investigation
have
L
.
chilense
in
their
pedigrees
.
The
plants
were
mechanically
inoculated
in
seedling
stage
.
The
inoculation
was
accomplished
by
rubbing
the
cotyledons
of
the
plants
previously
dusted
by
carborundum,
with
an
inoculum
prepared
from
infected
tomato
leaves
homogenized
in
cold
inoculation
buffer
.
The
plants
were
inoculated
twice
.
Visual
symptoms
were
used
as
a
criteria
for
evaluation
of
the
plant
reaction
.
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