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Growth parameters
3.2.3.3 Relative growth rate (RGR) of linseed genotypes
Relative growth rate has been considered
very important to make more
appropriate comparisons of growth among species or genotypes
under salinity than
absolute growth rate (Munns, 2005). The results of the
study showed a progressive
decrease in RGR with increasing salt concentration in
the external growth medium
(Table 3.2.2) and the maximum reduction was noted at 200 mM NaCl. There was
significant variation in RGR of all the genotypes at all the treatments, however, salt
sensitive genotype C-99-3-115 had a drastic reduction compared to other genotypes.
At control, the maximum RGR was observed in salt tolerant genotype NO-303 (0.94 g
g
-1
d
-1
) while the minimum RGR (0.80 g g
-1
d
-1
) was noted in salt sensitive genotype
S-907. At 100 mM NaCl, RGR of NO-303 reduced to 0.80 g g
-1
d
-1
and in S-907,
RGR reduced to 0.55 g g
-1
d
-1
. Similarly, at 200 mM NaCl, RGR of NO-303 (0.50 g
g
-1
day
-1
) and 637-72 was the maximum while that of C-99-3-115 (0.32 g g
-1
day
-1
)
and S-907 (0.34 g g
-1
day
-1
) was the minimum (Table 3.2.2). On the basis of reduction
percentage in RGR at higher salinity (200 mM NaCl)
when compared to their
respective control, the genotypes followed the ranking as: 637-72 (55%) > NO-303
(53%) > S-907 (42%) > C-99-3-115 (38%).
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