Heat
tolerance
and
bacterial
wilt
resistance
of
tomato
genotypes
in
the
humid
tropics
f
Kerala
.
eline
Agricultural
he
warm
humid
tropical
climate
characterized
by
high
day
and
night
temperature
and
uses
the
bacterial
wilt
incited
y
Ralstonia
solanacearum
resulting
in
complete
devastation
of
the
crop
.
Hence,
to
identify
a
al
site
is
located
at
8
.
5º
N
latitude
and
an
altitude
of
29
.
0
m
above
MSL
.
orty
two
genotypes
collected
from
different
sources
(Table
1)
were
evaluated
in
a
ndomized
block
design
with
two
replications
during
June
to
September
(South
West
onsoon
period)
.
The
mean
day
and
night
temperature
for
the
crop
period
was
29
.
4º
C
and
23
.
8º
C
.
The
rainfall
received
was
652
.
9
mm
spread
over
66
days
.
The
land
selected
for
the
experiment
was
a
bacterial
wilt
sick
plot
wherein
a
solanaceous
crop
was
cultivated
previously
.
Observations
on
fruit
set,
pollen
sterility,
yield
and
bacterial
wilt
were
recorded
.
The
fruit
set
percentage
ranged
from
17
.
57
in
LE
11
to
70
.
57
in
LE
46
.
The
lowest
percentage
of
pollen
sterility
was
noticed
in
LE
30
(2
.
31)
whereas
the
line
LE
36
recorded
the
maximum
(71
.
25)
.
The
highest
yielder
LE
34
(1967
.
5
g
/
plant)
recorded
high
fruit
set
(65
.
83%)
and
low
pollen
sterility
(3
.
66%)
.
High
temperature
often
results
in
low
fruit
set
due
to
pollen
sterility,
stigma
elongation
and
low
pollen
germination
(Rudich,
et
al
.
,
1977;
Weaver
and
Timm,
1989)
.
The
correlation
studies
revealed
significant
correlation
between
fruit
set
and
yield
(0
.
5153)
whereas
the
correlation
of
pollen
sterility
with
fruit
set
and
yield
was
negative,
though
not
significant
(
-
0
.
1394
and
-
0
.
1922)
.
Wessel
-
Beaver
and
Scott
(1992)
reported
strong
positive
correlation
between
fruit
set
and
yield
.
As
high
fruit
set
ability
is
controlled
by
dominant
genes
(Hanson
et
.
al
,
2002),
the
lines
with
high
fruit
set
viz
.
LE
46,
LE
38
and
LE
34
may
be
of
use
in
further
breeding
to
obtain
a
high
yielding
variety
.
The
results
of
the
observations
on
bacterial
wilt
incidence
under
field
conditions
revealed
that
20
accessions
were
resistant
whereas,
four
accessions
showed
100
per
cent
bacterial
wilt
.
Screening
under
artificial
epiphytotic
condition
is
essential
to
confirm
the
resistance
of
these
20
accessions
.
The
highest
yield
was
recorded
by
LE
34
followed
by
LE
1
and
LE
22
.
They
were
also
resistant
to
bacterial
wilt
.
They
possessed
high
fruit
set
ability
and
pollen
viability
and
can
be
considered
as
the
high
temperature
tolerant
accessions
suitable
for
the
humid
tropics
.
o
C
,
V
.
A
.
,
Chandrmony,
D
.
,
Gokulapalan,
C
.
and
Rajamony,
L
.
Kerala
University,
College
of
Agriculture,
Vellayani,
Thiruvananthapuram,
Kerala,
India
.
T
rainfall
leading
to
high
humidity
makes
it
extremely
difficult
to
grow
the
large
fruited
fresh
market
tomatoes
in
Kerala
.
This
coupled
with
high
soil
acidity
ca
b
tomato
genotypes
suitable
for
the
humid
tropics
of
Kerala,
a
study
was
taken
up
t
the
Department
of
Olericulture,
College
of
Agriculture,
Vellayani,
Thiruvananthapuram,
Kerala
.
The
experiment
F
ra
m
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