103
respectively (Table 3.3.1).
On the other hand, EL was relatively higher i.e. 26.90%
and 26.83% in salt sensitive genotypes S-907 and C-99-3-115 respectively at 200 mM
NaCl.
3.3.3.2 Effect of salt stress on photosynthetic pigments
Effect of NaCl application on chlorophyll ‘a’, ‘b’ contents and chlorophyll a+b in
four linseed genotypes are depicted in Table 2. Salinity treatments caused significant
decrease in chlorophyll ‘b’ in all the four genotypes while
there was no significant
decrease in chlorophyll ‘a’ contents in linseed genotypes at all the treatment levels.
On the other hand, a significant decrease in chlorophyll a+b
was observed in all the
four genotypes with increasing levels of salinity (Table 3.3.2). Maximum chlorophyll
‘a’ (0.25 mg g
-1
FW) and chlorophyll ‘b’ (0.23 mg g
-1
FW) was recorded in control
treatment while minimum concentration of chlorophyll ‘a’ (0.21 mg g
-1
FW) and ‘b’
(0.10 mg g
-1
FW) was observed at 200 mM NaCl.
Similarly, the maximum
chlorophyll a+b was recorded at control and the minimum quantity of chlorophyll a+b
was recorded at 200 mM NaCl. There was no significant
difference in linseed
genotypes for chlorophyll ‘a’ at all the treatments but chlorophyll ‘b’ contents were
significantly varied among genotypes. At 100 mM NaCl, chlorophyll ‘b’ decreased
progressively and its reduction ranged from 0.23 to 0.19 mg g
-1
FW in NO-303
genotype and from 0.20 to 0.15 mg g
-1
FW in S-907 genotype. While at 200 mM
NaCl, chlorophyll ‘b’ further reduced to 0.16 mg g
-1
FW
in salt tolerant genotypes
while it was 0.10 mg g
-1
FW in salt sensitive genotypes. At 200 mM NaCl, the
maximum chlorophyll a+b contents were found in salt tolerant genotypes while the
minimum were measured in S-907 (Table 3.3.2). On %
control basis, genotype
637-72 performed better followed by NO-303 at both 100 and 200
mM NaCl
concentrations.
104
Table 3.3.2. Chlorophyll contents (a, b) and chlorophyll a+b in leaves of salt sensitive (S-907 and C-99-3-115) and salt tolerant (637-72 and
NO-303) genotypes of linseed.
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