89
3.2.3.15 Partitioning of Na
+
ion in linseed genotypes at different salinity
levels
Na
+
partitioning in linseed genotypes was examined after the application salt
stress. It was noted that salt tolerant genotypes (637-72 and NO-303) bound more Na
+
in the root section after the application of salt treatments. At control, salt sensitive and
tolerant genotypes bound almost
equal percentage of Na
+
in roots but with the
application of salt stress, ability of salt tolerant genotypes to accumulate Na
+
in roots
increased rapidly and genotypes 637-72
accumulated more Na
+
(53% and 60%)
followed by NO-303 (47% and 61%) as compared to S-907 (43% and 48%) and
C-99-3-115 (44% and 53%) at 100 and 200 mM NaCl concentration respectively (Fig.
3.2.1). It was also noted that Na
+
accumulation was more in shoots and leaves of salt
sensitive genotypes which perhaps damaged the growth and development of these
plants. At, 100 mM NaCl,
leaf Na
+
concentration was 27% and 30% in S-907 and
C-99-3-115 which was higher than 22% and 25% in 637-72 and NO-303 genotypes
respectively.
Similarly, shoot Na
+
concentration remained higher 24-25%
in salt
sensitive genotypes as compared to salt tolerant genotypes which accumulated
18-20% Na
+
in their shoots at 200 mM NaCl. As leaves are the most sensitive part of
plants, so Na
+
accumulation was less in the leaves of all linseed genotypes at 200 mM
NaCl when compared at 100 mM NaCl (Fig. 3.2.1).
Fig. 3.2.1.
Distribution of Na
+
ion in different parts of linseed genotypes at different salinity levels
