SCREENIN G O F SUGARCAN E (Saccharu m officinara m L. ) CULTIVAR S FO R CARBO N MONOXID E SENSITIVIT Y AN D NITRAT E REDUCTAS E ACTIVIT Y UNDE R SAL T STRES S CONDITION S
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Date
1991
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
MPKV, UNIVERSITY LIBRARY RAHURI
Abstract
The redox state of cytochrome c_ oxidase during
in situ respiration of seventeen promising sugarcane cultivars
was monitored by examining the reaction of this enzyme
with carbon monoxide, as expressed by production of nitrite
during aerobic assay of in_ vivo nitrate reductase. All the
seventeen sugarcane cultivars thus tested were found to be
completely sensitive to CO, indicating thereby that the
cytochrome a-, in these cultivars was in a highly reduced
state during the steady state respiration.
The salt stress induced by two sodium salts, viz.,
NaCl, Na 2 S0 4 and the equimolar mixture of NaCl and Na 2 S0 4
decreased the nitrate reductase activity, more pronounced
decrease being observed by Na2So4 than either by NaCl alone
o
r
it
s
combinatio
n
wit
h
Na
2
S0
4
,Th
e
sal
t
stres
s
als
o
decrease
d
th
e
reducin
g
an
d
non-reducin
g
sugar
s
an
d
chlorophyl
l
an
d
potassiu
m
content
,
bu
t
increase
d
th
e
prolin
e
conten
t
o
f
sugarcan
e
leaves
„
Amongs
t
th
e
fou
r
sugarcan
e
cultivar
s
studied
,
Co-752
7
ha
d
th
e
highes
t
nitrat
e
reductas
e
activit
y
unde
r
stresse
d
conditions
,
an
d
coul
d
retai
n
maximu
m
i
n
viv
o
NR
activit
y
unde
r
th
e
stresse
d
condition,
.
O
n
th
e
basi
s
o
f
increas
e
i
n
accumulatio
n
o
f
prolin
e
i
n
leave
s
an
d
retentio
n
o
f
chlorophyl
l
content
,
th
e
cultiva
r
Co-41
9
appeare
d
t
o
b
e
mor
e
sal
t
toleran
t
tha
n
th
e
othe
r
cultivar
s
o
f
sugarcane
o
Th
e
increase
d
respons
e
o
f
thes
e
cultivar
s
t
o
carbo
n
monoxid
e
du
e
t
o
sal
t
stres
s
coul
d
possibl
y
b
e
du
e
t
o
decrease
d
mitochondria
l
respiration,
.
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