21
et
al
(1997)
.
In
our
investigation
samples
received
from
crossings
with
L
.
hirsutum
were
characterised
by
the
large
range
of
various
forms
.
The
fruits
were
yellow,
orange
and
green;
from
3
up
to
20
fruits
in
a
cluster;
the
shape
of
fruits
was
diverse
.
The
samples
gave
high
resistance
based
on
hypersensitivity
.
Samples
L
.
hirsutum
,
even
though
resistant,
seemed
to
be
a
complex
population
in
which
there
were
susceptible
forms
.
A
crossing
with
L
.
parviflorum
was
suggested
by
Lindhout
(1994)
as
a
source
of
immunity
.
The
resistance
based
on
hypersensitivity
was
seen
in
the
offspring,
but
the
hybrids
were
of
a
wild
type
and
consequently
were
not
of
interest
for
breeding
.
The
most
interesting
in
terms
of
introduction
of
resistance
were
the
combinations
with
L
.
cheesmanii
and
L
.
humboldtii
.
According
to
our
data
several
small
genes
probably
caused
their
resistance
and
the
opportunity
of
creating
hybrids
of
a
cultural
type
was
much
higher
than
using
of
other
donors
.
Samples
selected
from
various
generations
of
a
combination
L
.
esculentum
x
L
.
humboldtii
VIR
2884
did
not
give
stable
resistance
with
artificial
inoculation,
however
75
%
of
the
samples
showed
field
resistance
(1
.
5
-
2
scores
when
disease
severity
of
the
susceptible
control
was
4)
.
Use
of
this
donor
of
resistance
in
crosses
with
samples
with
moderate
resistance
resulted
in
the
stabilisation
of
hybrid
resistance
.
Important
characters
were
beautiful
shape
and
colour
of
fruits
3
-
3,5
cm
in
diameter
.
These
donors
improved
the
shape
of
fruits
in
crossings
.
The
line
possesses
high
resistance
of
fruits
to
late
blight
as
well
.
In
sample
175/98
derived
from
the
combinations
L
.
esculentum
x
L
.
cheesmanii
K3889
the
resistance
was
stabilised
in
F8
-
9
generations
of
individual
selection
.
The
resistance
of
seedlings
under
the
artificial
inoculation
by
spraying
with
spores’
suspension
was
characterised
by
development
of
lesions
up
to
level
1
.
5
marks
with
average
sporulation
and
following
localisation
and
necroses
of
the
lesion
.
Under
conditions
of
natural
inoculation
symptoms
were
absent
or
were
shown
small
yellow
spots
with
necroses
.
In
a
few
samples
the
feature
of
genetic
necroses
was
noted
.
Some
samples
had
fruits
4
.
5
-
6
cm
in
diameter,
with
a
delicate
taste
.
It
was
characterised
by
good
combining
ability
.
Use
of
such
sources
as
L
.
hirsutum,
L
.
parviflorum
is
complicated
because
of
the
incompatibility
barrier
and
difficulty
of
creation
of
hybrids
with
L
.
esculentum
.
The
hybrids
with
L
.
cheesmanii,
L