111
glycinebetaine concentrations in salt tolerant genotypes NO-303 and 637-72 were not
significantly different from salt sensitive genotypes (S-907 and C-99-3-115) in control
treatment. However, genotypes showed progressive increase in their proline and GB
concentration with increasing salinity and proline concentration varied from 11.33 to
12.20 mg g
-1
FW while GB contents increased from 10.53 to 12.03 µmol g
-1
DW in
S-907 genotypes.
Similarly, proline contents increased from 11.73 to 13.47 mg g
-1
FW and GB increased from 10.83 to 13.58 µmol g
-1
DW in 637-72 genotype at 100
mM NaCl. At 200mM NaCl, proline concentration of salt tolerant genotypes NO -303
(15.17 mg g
-1
FW) and 637-72 (14.93 mg g
-1
FW) was higher than C-99-3-115 (14.67
mg g
-1
FW) and S-907 (13.57 mg g
-1
FW) (Table 3.3.6). It was observed that genotype
637-72 had more proline concentration at 100 mM NaCl but at 200 mM NaCl,
NO-303 produced more proline than 637-72. Similar trend
was observed in case of
GB concentration and relatively high concentration of GB
was noted in salt tolerant
genotype 637-72 (13.58 µmol g
-1
DW) at 100 mM NaCl but at 200 mM NaCl,
NO-303 produced more GB (15.03 µmol g
-1
DW) as compared to 637-72 (14.97 µmol
g
-1
DW) while salt sensitive genotypes had lower concentrations of proline and GB at
both levels of salt stress.
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