Tomato
resistance
to
phytophthorosis
in
a
protected
crop
Ignatova
S
.
I
1
.
,
Gorshkova
N
.
S
.
1
,
Bagirova
S
.
F
.
2
1
.
All
-
Russian
Scientific
Research
Institute
for
Vegetable
Crops,
Department
of
Plant
Breeding,
mail
-
box
15,
Moscow
105215,
Russia
2
.
Department
of
Mycology
and
Algology,
Moscow
State
University,
Moscow
119899,
Russia
In
the
recent
seasons
tomato
diseases,
caused
by
Phytophthora
soilborne
species,
have
become
more
severe
in
greenhouses
in
Moscow
.
More
aggressive
populations,
which
are
capable
of
colonizing
tomato
roots,
shoots,
stems,
foliage,
fruits
and
of
killing
plants
rapidly,
seem
to
be
involved
.
Disease
symptoms
have
become
more
diverse
and
appear
at
earlier
growth
phases
of
tomato
plants
.
Strains
of
Phytophthora
capsici
isolated
from
diseased
tomato
plants
were
used
in
bio
-
assays
to
find
resistant
tomato
samples
.
CRA
-
66
(accession
number
13225,
VIR)
was
found
to
be
the
most
resistant
against
the
pathogen
.
L
.
pimpinellifolium
(accn
3930
and
3731,VIR),
L
.
chilense
(accn
5031,
VIR),
L
.
peruvianum
v
.
humifusum
(accn
3967,
VIR),
L
.
humboldtii
(accn
353/2,
VIR)
showed
a
high
resistance
.
Selected
tomato
lines,
l
-
372,
l
-
342,
l
-
349
(NISTIO,
Moldova),
were
also
characterised
by
high
resistance
.
These
results
were
confirmed
as
well
by
the
data
obtained
under
natural
epidemic
conditions
.
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