Pineapple
fruits
of
susceptible
Cayenne
variety
exposed
to
10
and
25
degree
exhibited
electrolyte
membrane
leakages
unlike
resistant
MD
2
(fig
2
)
.
Thus
pineapple
fruit
resistance
to
cold
stress
correlated
well
with
electrolyte
leakage
as
it
has
been
shown
previously
(
2
)
.
Our
data
support
the
findings
that
fruit
and
plant
varieties
exhibited
various
resistance
to
membrane
damage
(related
to
membrane
permeability),
the
resistant
variety,
greater
membrane
stability
under
stress
.
Results
concerning
POX
activity
suggested
that
this
enzyme
is
involved
in
enzymatic
browning
(Fig
3
)
and
conversely
correlated
with
cold
stress
:
MD
2
variety
(resistant)
showing
the
lower
values
as
compared
to
Cayenne
(susceptible)
.
Cold
stress
induced
an
increase
in
PAL
and
POD
activity
in
both
pineapple
varieties
(MD
2
and
Cayenne)
during
continuous
low
temperature
storage
(F),
being
higher
in
C
variety
than
in
MD
2
.
Rising
the
temperature
after
cold
stress
lowered
PAL
and
POD
activities
(fig
4
and
5
)
.
According
to
the
results
:
membrane
permeability,
POX,
PAL
and
POD
activities
could
be
useful
parameters
to
screen
varieties
for
cold
stress
tolerance
.
Previous
studies
(
3
)
showed
that
endoproteolytic
activities
were
involved
in
drought
stress
response
of
plants
.
Similarly
the
results
obtained
showed
that
cold
stress
induced
a
decrease
in
protease
gene
expression,
particularly
in
the
resistant
variety
(MD
2
)
.
Therefore,
it
seemed
that
endoprotease
activity
is
likely
to
play
a
role
in
chilling
susceptibility
.
Experiments
are
in
progress
on
proteolytic
enzyme
regulation
during
pineapple
enzymatic
browning
.
Pineapple
fruits
of
susceptible
Cayenne
variety
exposed
to
10
and
25
degree
exhibited
electrolyte
membrane
leakages
unlike
resistant
MD
2
(fig
2
)
.
Thus
pineapple
fruit
resistance
to
cold
stress
correlated
well
with
electrolyte
leakage
as
it
has
been
shown
previously
(
2
)
.
Our
data
support
the
findings
that
fruit
and
plant
varieties
exhibited
various
resistance
to
membrane
damage
(related
to
membrane
permeability),
the
resistant
variety,
greater
membrane
stability
under
stress
.
Results
concerning
POX
activity
suggested
that
this
enzyme
is
involved
in
enzymatic
browning
(Fig
3
)
and
conversely
correlated
with
cold
stress
:
MD
2
variety
(resistant)
showing
the
lower
values
as
compared
to
Cayenne
(susceptible)
.
Cold
stress
induced
an
increase
in
PAL
and
POD
activity
in
both
pineapple
varieties
(MD
2
and
Cayenne)
during
continuous
low
temperature
storage
(F),
being
higher
in
C
variety
than
in
MD
2
.
Rising
the
temperature
after
cold
stress
lowered
PAL
and
POD
activities
(fig
4
and
5
)
.
According
to
the
results
:
membrane
permeability,
POX,
PAL
and
POD
activities
could
be
useful
parameters
to
screen
varieties
for
cold
stress
tolerance
.
Previous
studies
(
3
)
showed
that
endoproteolytic
activities
were
involved
in
drought
stress
response
of
plants
.
Similarly
the
results
obtained
showed
that
cold
stress
induced
a
decrease
in
protease
gene
expression,
particularly
in
the
resistant
variety
(MD
2
)
.
Therefore,
it
seemed
that
endoprotease
activity
is
likely
to
play
a
role
in
chilling
susceptibility
.
Experiments
are
in
progress
on
proteolytic
enzyme
regulation
during
pineapple
enzymatic
browning
.
การแปล กรุณารอสักครู่..
