Resistance
to
tobacco
etch
virus
in
Lycopersicon
hirsutum
.
Legnani,
R
.
*,
Gebre
-
Selassie,
K*,
Marchoux
G*,
Laterrot,
H**
.
*INRA
-
Station
de
pathologie
vegetale
-
BP
94
-
84143
Montfavet,
Cedex,
France
.
**INRA
-
Station
d'amelioration
des
plantes
maraicheres
-
BP
94
-
84143
Montfavet,
Cedex,
France
.
Tobacco
etch
virus
(TEV)
causes
serious
economic
losses
in
Solanaceous
crops
.
This
potyvirus
is
commonly
found
on
tomato
an
the
east
coast
of
Florida
(Zitter,
1991)
.
This
virus
is
also
present
in
South
America
(Zitter,
1991),
Cuba
(Fernandez,
1979),
the
Philippines
(Xuan
et
al,
1987),
Taiwan
(Yoon
et
al,
1989),
Thailand
(Yoon
et
al,
1989),
and
Turkey
(Yilmaz
and
Davis,
1985)
.
TEV
causes
stunting
on
tomato
plants
and
intense
mottling
on
tomato
leaves
and
fruits
.
In
conditions
of
natural
infection,
the
crop
loss
may
be
total
if
seedlings
are
infected
just
after
transplanting
(litter,
1991)
.
Sources
of
resistance
or
tolerance
to
TEV
have
been
reported
in
L
.
esculentum
PI
183692
(Walter,
1956)
and
in
Pt
166989
(Alexander,
1959),
and
in
L
.
hirsutum
PI
134417,
PI
127827
(Alexander
and
Hoover,
1955),
and
PI
247087
(Hikida
and
Raymer,
1972)
.
However,
no
tolerant
or
resistant
tomato
cultivars
are
available
(Zitter,
1991)
.
The
following
accessions
were
screened
for
resistance
to
TEV
by
artificial
mechanical
inoculations
.
Some
of
them
were
previously
described
resistant
to
potyviruses
(TEV
and/or
potato
virus
Y):
The
susceptible
tomato
controls
were
the
INRA
line
Monalbo
and
its
near
isogenic
line
Momor
resistant
to
TMV
(
Tm
-
2
2
)
.
Screening
for
resistance
to
tobacco
etch
virus
has
been
realized
in
growth
chamber
at
INRA
-
Avignon,
during
1995
.
Twenty
plants
of
each
genotypes
were
inoculated
with
the
strain
of
TEV
called
"CAA
10"
and
coming
from
California
.
The
symptoms
were
scored
45
days
after
inoculation
.
In
order
to
confirm
visual
reactions,
DAS
-
ELISA
tests
were
performed
on
each
plant
45
days
after
inoculation
.
Stunt
of
the
plant,
distortion
and
mosaic
of
the
leaves
were
observed
on
all
the
plants
of
Momor,
Monalbo,
Angela
18
.
1,
P1
126410,
F,
Sweet
100,
F,
Sweet
Million,
F,
Micro
Tom,
PI
134417
and
PI
128660
.
No
symptoms
were
observed
on
PI
247087,
LA
716
and
LA
1478
.
Among
the
12
tested
genotypes
TEV
was
detected
in
the
upper
noninoculated
leaves
of
all
the
plants
of
11
accessions
by
ELISA
.
No
virus
was
detected
by
ELISA
in
the
upper
non
inoculated
leaves
of
L
.
hirsutum
PI
247087
.
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