Mutation
of
fruit
diameter
Avdeyev
Y
.
I
.
1
,
Kigashpaeva
O
.
P
.
2
,
and
Avdeyev
A
.
Y
.
2
.
1
Astrakhan
State
University
.
2
All
-
Russian
Scientific
Institute
of
Irrigative
Vegetable
and
Melon
Growing
.
In
1997
in
the
tomato
variety
Malinovka,
forming
plumy
-
type
form
(ovate)
fruits
5
-
5
.
5
cm
in
length
and
3
.
0
-
3
.
5
cm
in
diameter,
we
found
one
plant
(1:10
5
)
with
fruits,
the
length
of
which
is
equal
to
initial
variety,
but
diameter
decreased
in
1
.
5
-
1
.
7
times
.
The
mutant
trait
was
inherited
.
The
hybrid
F
1
(mutant
x
Malinovka)
had
intermediate
fruit
diameter
.
In
F
2
we
found
monohybrid
segregation;
9
(small
diameter)
:
(31
large
diameter),
X
2
=0
.
133;
0
.
75>P>0
.
50
.
We
also
observed
1
.
3
-
1
.
5
times
diminishing
of
fruit
diameter
in
the
spontaneous
mutant
of
Bahtemir
variety
(frequency
1:8
x
10
3
)
.
In
2002
year
the
spontaneous
mutation
of
considerable
decreasing
of
fruit
diameter
in
the
variety
Transnovinka
(sp,
o,
j
-
2,
u)
was
found
.
The
fruit
diameter
of
the
mutant
was
2
times
smaller
than
in
Transnovinka
variety
(2
.
2
cm
against
4
.
5
cm)
(Figure
1)
.
The
length
of
fruit
was
not
changed
.
The
mutation
was
named
"small
diameter"
.
It
is
known,
that
plumy
form
(ovate)
of
fruit
is
inherited
as
recessive
monogene,
named
by
symbol
"o"
and
localized
in
the
chromosome
2,
position
55
(Rick
et
.
al
.
,
1987)
.
Gene
of
round
fruit
(0)
is
its
dominant
allele
(Kirillova
et
al
.
,
1990)
.
"o"
and
that
both
alleles
of
fruit
form
represent
a
cluster
of
two
connected
different
monogenes,
one
of
which
is
controlling
length,
and
other
width
of
fruit
.
Mutation
of
each
of
them
leads
to
genetic
change
of
fruit
form
.
The
existence
of
many
alleles
of
both
genes
in
Figure
1
.
Transnovinka
variety
on
top,
mutant
fruit
on
bottom
.
On
the
basis
of
the
above
-
mentioned
facts
it
is
supposed
existence
two
alleles
of
gene
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