| dc.description.abstract | Development of salt tolerant wheat genotypes and/or amelioration of
the effect of salt stress are the possible options for utilizing salt
affected coastal soil in Bangladesh. In the present investigation, five
experiments were carried out during September 2013 to April 2015.To
investigate the influence of salinity on germination characters and
seedling growth thirty wheat genotypes were tested in petridish under
control and saline (15 dS m-1) condition and found that salinity delayed
germination and affected seedling growth in different scale in
different wheat genotypes. Based on seedling dry weight twenty two
wheat genotypes showed more than 0.8 Salt Tolerance Index (STI) and
eight genotypes provided less than 0.80 STI. Thirty wheat genotypes
were grown in tray containing different levels (Control, 6 and 12 dSm1) of artificially developed saline soil up to 30 days. Emergence index,
shoot length, root length and seedling dry weight were found to be
reduced in different scale with the increment of soil salinity levels.
Eight wheat genotypes showed more than 0.5 STI and twenty two
genotypes provided less than 0.50 STI at moderate salinity level. At
higher salinity level only five genotypes showed more than 0.3 STI and
twenty five genotypes provided less than 0.3. Three comparatively salt
tolerant (Sourav, Shatabdi and BAW 1186) and one salt sensitive
(BAW 1199) wheat genotypes selected from experiment 1 and 2 based
on seedling dry weight were grown in pot under different artificially
developed soil salinity levels (Control, 6 dS m-1, 8 dS m-1 and 10 dS m1) to observe the sensitivity of physiological traits resulting reduced
grain yield under saline condition. Wheat genotype Sourav and
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Shatabdi accumulated greater quantity of proline, lesser amount of
Na+, greater amount of K+ and maintained greater K+ to Na+ ratio
under saline condition than BAW 1186 and BAW 1199. Grain yield per
plant was reduced with the increment of soil salinity in all the wheat
genotypes where Shatabdi affected lesser than others wheat
genotypes. Different seed priming treatments were found to be
effective to improve speed of germination and early seedling growth of
different wheat genotypes (Shatabdi, Sourav and BARI Gom 26) under
saline condition. Based on seedling dry weight hydropriming,
osmopriming with KCl and osmopriming with NaCl were found to be
effective for Sourav, hormonal priming with salicylic acid,
osmopriming with CaCl2 and osmopriming with KCl were found
effective for Shatabdi and all seed priming treatments except
hormonal priming with salicylic acid were found effective for BARI
Gom 26.These three wheat genotypes were tested in a pot experiment
with four nutrient management treatments and only extra K+
management was found effective to improve grain yield per plant in
Shatabdi. The overall results indicated that based on physiological
tolerance and agronomic traits Shatabdi was found to be more salt
tolerant than all other wheat genotypes tested in the present study
and extra K+ management could improve grain yield per plant in only
in Shatabdi. | en_US |
