| dc.description.abstract | An experiment was conducted at the Department of Genetics and Plant Breeding
Laboratory of Hajee Mohammad Danesh Science and Technology University, Dinajpur
during November, 2017. Here, twenty maize inbred lines were screened to investigate
them against different levels of salt stress on germination and seedling morphological
characteristics. The salt stress conditions were created in laboratory conditions using
three different levels of NaCl concentration with a control such as 0, 5, 10, and 15 dSm-1
.
The experiment was laid out in completely randomized design (CRD) with three
replications. Most of the traits were evaluated at 14 days after sowing of seeds on all
experimental genotypes. The results of the analysis of variance revealed significant
differences among the genotypes and treatments for all the characters studied viz.
germination percentage, number of leaves per plant, number of roots per plant, shoot
length, root length, shoot fresh weight, root fresh weight, root dry weight, shoot dry
weight, root shoot fresh weight ratio except root shoot dry weight ratio. The genotype x
treatment interaction was significant for most of the characters except root shoot fresh
weight ratio. According to some genetic parameter studied, there was significant
variability existed among the genotypes for the all characters. Here, high heritability
along with high magnitude of genetic advance in percentage of mean was recorded
among most of the traits. Significant correlation was found among most of the characters
such germination percentage, number of leaves per plant, shoot length, shoot fresh
weight, shoot dry weight, root length, number of roots per plant, shoot dry weight and
root dry weight under among them both control and stress condition. This indicated that
simultaneous selection of all these characters was important for screening of maize
genotype. Considering all the characters for all genotypes when these raised up to
seedling stage without any salt stress (T0), it was found that the genotype ML05 stood
first position in performance and was closely followed by ML11 and ML19. When these
genotypes were exposed under low salt stress (T1), the genotype ML11 showed superior
performance among other genotypes in respect of all the traits, which was followed by
ML05 and ML28. In case of mild salt stress (T2), the genotype ML28 exhibited greater
performance for all studied traits that was followed by ML19, ML10, ML26. When the
genotypes exposed to severe stress conditions (T3), it was observed that the genotype
ML28 performed best among all the genotypes which was followed by ML05 and ML11
for germination percentage, number of leaves per plant, number of roots per plant, shoot
length, root length, shoot fresh weight, root fresh weight, root dry weight, shoot dry
weight, root shoot fresh weight ratio and root shoot dry weight ratio. According to the
ranking based on all treatments and studied traits, the genotypes ML28, ML19, ML10,
ML05, ML26 performed better compared to other genotypes. Again, the results of Salt
Tolerant Index (STI) indicated the superiority in the ML28 closely followed by the
genotypes ML26, ML24, ML10, ML06, ML11, ML12, ML05, ML19 in highest salinity
level (T3). These inbred lines could be designated as salt tolerant from the study. This
finding could be confirmed by further in vivo or field condition research as well as
marker assisted breeding research. Therefore, ML28, ML19 ML05 ML10, ML11 and
ML26 could be helpful to find out salt tolerant gene and to develop salt tolerant variety
in near future | en_US |
