Effect
of
TYLCV
infection
on
fruit
yield
of
tolerant
greenhouse
tomato
cultivars
1
Milo,
J
.
,
2
Leviatov,
S
.
,
2
Shani,
A
.
,
1
Kedar,
N
.
evaluate
the
effect
of
Tomato
Yellow
Leaf
Curl
Virus
YLCV
-
Is)
infection
on
fruit
yield
in
commercial
and
experimental
cultivars
that
are
resistant
affected
.
In
this
study
we
compared
six
cultivars
with
different
vels
of
tolerance
to
the
standard
susceptible
cultivar
.
aterial
and
Methods
Cu
Anastasia
(Bruinsma)
High
level
of
tolerance
.
(Ana
.
)
Bo
916
-
A
sted
in
the
TBRT
-
Guatemala
and
had
good
tolerance
to
the
Central
American
virus
isolates
(no
trial
in
the
Seminis
experimental
station
in
Guatemala)
.
922
932
957
-
(Zeraim)
-
Medium
level
of
tolerance
–
Based
on
TY1
gene
.
144
-
Daniela
(Hazera)
-
Susceptible
control
.
Seedlings
were
obtained
from
a
commercial
nursery
(Speedling)
25
days
after
sowing
.
Ten
plants
of
each
cultivar
were
inoculated
by
caging
the
seedlings
for
4
days
before
planting
with
viruliferous
whiteflies
in
an
insect
proof
greenhouse
.
Another
10
plants
of
each
cultivar
were
kept
until
planting
in
the
nursery,
protected
from
whiteflies
.
All
the
seedlings
were
treated
with
Confidor
before
transplanting
.
The
infected
and
the
protected
plants
were
planted
on
September
15
in
a
commercial
insect
proof
greenhouse
and
grown
under
standard
conditions
.
All
red
fruits
were
harvested
five
times
during
the
growing
season,
from
the
end
of
January
to
the
beginning
of
May
.
Results
Four
weeks
after
planting
TYLCV
symptoms
were
detected
in
all
of
the
infected
susceptible
control
plants
.
The
less
tolerant
cultivar
916
had
clear
but
milder
symptoms
of
the
disease,
which
were
visible
throughout
the
season
.
The
medium
tolerant
cultivars
922
and
957
showed
very
mild
symptoms
during
the
early
stage
of
growth
.
The
symptoms
became
very
1
Dept
.
of
Field
Crops,
Vegetables
and
Genetics,
Faculty
of
Agriculture,
Food
and
Environmental
Quality
Sciences
.
The
Hebrew
Univ
.
of
Jerusalem
.
P
.
O
.
Box
12
Rehovot,
76100
Israel
.
2
Zeraim
Gedera
Ltd
.
,
P
.
O
.
Box
103,
Gedera,
70750
Israel
.
E
-
mail:zeraim@zeraim
.
co
.
il
Introduction
The
purpose
of
this
study
was
to
(T
or
tolerant
to
this
virus
.
Since
the
virus
is
present
in
the
resistant
plants
(Cohen
and
Antignus,
1994)
we
prefer
to
use
the
term
tolerance
instead
of
resistance
.
Although
the
amount
of
the
virus
in
tolerant
plants
is
significantly
less
than
in
susceptible
ones
the
yield
in
infected
tolerant
plants
is
le
M
ltivars:
loudo
(Petoseed)
High
level
of
tolerance
.
(Bol
.
)
mareto
(Zeraim)
-
Low
level
of
tolerance
for
TYLCV
-
Is
.
This
cultivar
was
te
symptoms
in
field
-
Tovi
-
Green
(Zeraim)
-
Medium
level
of
tolerance
.
-
Tovi
-
Can
(Zeraim)
-
High
level
of
tolerance
.
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