Two
weeks
after
the
inoculation
the
plants
were
evaluated
and
40
lines
out
of
80
totally
screened
were
found
in
segregation
for
resistance
to
TSWV
.
Ten
lines
showed
more
than
50%
of
the
plants
resistant
to
TSWV
.
Later
on
some
of
the
plants
selected
as
resistant
developed
typical
symptoms
for
TSWV
.
The
plants
selected
from
10
lines
stayed
symptomless
till
the
end
,
when
grown
for
seeds
.
The
plants
are
vigorous,
indeterminate,
with
middle
size
fruits
.
Our
results
support
those
of
Stevens
et
al
.
(1994)
regarding
TSWV
resistance
in
L
.
chilense
and
also
their
suggestion
that
"other
potential
useful
TSWV
resistance
genes
probably
exist
within
the
genus
Lycopersicon"
.
ACKNOWLEDGMENTS
I
am
grateful
to
Dr
.
A
.
Stevens
and
J
.
Kao
for
their
good
cooperation
.
Literature
Cited:
Manuelyan,
H
.
,
M
.
Yordanov
and
L
.
Stamova
.
1993
.
Breeding
for
p
-
carotene
tomatoes
.
Proceedings
of
the
XII
th
EUCARPIA
Meeting
on
tomato
genetics
and
breeding
.
,
Plovdiv,
Bulgaria,
pp
107
-
111
.
Stevens,
M
.
R
.
,
S
.
J
.
Scott
and
R
.
C
.
Gergerich
.
1992
.
Inheritance
of
a
gene
for
resistance
to
tomato
spotted
wilt
virus
(TSWV)
from
L
.
peruvianum
Mill
.
Euphytica
59:
9
-
17
.
Stevens,
M
.
R
.
,
S
.
J
.
Scott
and
R
.
C
.
Gergerich
.
1994
.
Evaluation
of
seven
Lycopersicon
species
for
resistance
to
tomato
spotted
wilt
virus
(TSWV)
.
Euphytica
80:
79
-
84
.
Resistance
to
Pseudomonas
syringae
pv
.
tomato
.
Stamova,
L
Dept
Veg
.
Crops,
Univ
.
Calif
.
Davis,
CA
95616
Resistance
to
bacterial
speck
pathogen
Pseudomonasd
syringae
pv
.
tomato
(P
.
s
.
t
.
)
race
0
is
controlled
by
the
single
dominant
gene
Pto
1
/(Pitblado
and
Kerr,
1980)
or
Pto
2
(Pilowsky
and
Zutra,
1992)
.
Lawton
and
Mac
Neill
(1986)
in
Canada
and
Bogatsevska
et
al
.
(1989)
in
Bulgaria
have
published
about
appearance
of
race
1
that
is
pathogenic
on
Pto
I
cultivars
.
Resistance
to
race
1
was
found
in
L
.
chilense
and
L
.
pimpinellifolium
(Stamova
et
al
.
,
1990)
and
two
novel
genes
Pto
3
and
Pto
4
were
identified
in
L
.
hirsutum
var
.
glabratum,
controlling
resistance
to
the
both
races
/Stockinger
and
Walling,
1994/
.
In
1995
we
screened
for
resistance
to
race
0,
fifty
seven
lines
having
L
.
chilense,
L
.
pennellii
and
L
.
pimpinellifolium
in
their
pedigrees
.
No
one
line
was
found
to
be
homozygous
resistant
but
many
lines
segregated
for
resistance
to
race
0,
some
of
them
showing
more
than
50
%
of
the
plants
resistant
to
P
.
s
.
t
.
Lines
coming
from
crosses
with
L
.
chilense
differ
in
size
and
color
of
the
fruits,
indeterminant
and
determinant
plant
habit
as
well
as
resistance
to
other
diseases
.
The
results
support
our
earlier
finding
(Stamova,
1990)
about
resistance
to
P
.
s
.
t
.
in
L
.
chilense
derivatives
.
Line
341
-
94
derived
from
a
cross
with
L
.
pennellii
(unknown
origin)
was
found
to
show
38%
of
the
plants
resistant
to
P
.
s
.
t
.
To
our
knowledge
a
few
reports
refer
to
the
reaction
of
L
.
pennellii
to
P
.
s
.
t
.
,
except
-
that
of
Stockinger
and
Walling
report
susceptibility
of
L
.
pennellii
LA
716
to
race
0
and
race
1
.
Additional
study
is
needed
to
clear
up
the
independence
or
similarity
of
new
found
resistance
and
already
known
resistant
genes
.
ACKNOWLEDGMENTS
I
would
like
to
thank
Dr
.
A
.