| 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 Boro season of 2017. Twenty four rice genotypes including 20 land races were
screened to investigate the germination and seedling morphological characteristics
against different levels of salt stress. The saline conditions were created in laboratory
using five different treatments of NaCl i.e., 0, 4 dS/m, 8 dS/m, 12dS/m and 16 dS/m. The
experiment was laid out in completely randomized design (CRD) with three replications.
Several parameters such as germination percentage, number of root, shoot length, root
length, shoot fresh weight, root fresh weight, shoot dry weight, root dry weight,
chlorophyll content and proline content of rice seedlings were studied. Most of the traits
were evaluated at 14 days after sowing of seeds on all experimental genotypes. The
genotypes differed significantly for all traits. Furthermore, the treatment effects were
also significant for all studied traits. It was revealed that with increase of salt stress
germination percentage, germination rate, seedling vigor index, number of roots, shoot
length, root length, total length of the plant, shoot fresh weight, root fresh weight, total
fresh weight, root dry weight, shoot dry weight and total dry weight were decreased in
most of the genotypes. Phenotypic coefficient of variation was higher than the genotypic
coefficients of variation indicating environmental influence on the traits. High
heritability coupled with high to moderate genetic advance as percent of mean was
observed for all the traits except number of leaves and root dry weight. These characters
can be further used for selection of superior genotypes. In this study, the interrelationship between studied traits and its contributing characters were determined by
correlation matrix. The result of the correlation co-efficient among measured traits under
control and saline conditions showed that the traits had a significantly positive
correlation with corresponding traits. According to the experimental result based on
different traits the superior genotype was Pokkali 8948 followed by FL-478, Chota lona
kuchi and Bara lona kuchi among the 24 genotypes. These landraces could be designated
as salt tolerant from studying it. This finding could be confirmed by further in vivo or
field condition research as well as marker assisted breeding research. Therefore, Pokkali
8948, FL-478 and Chota lona kuchi could be helpful to find out salt tolerant gene and to
develop salt tolerant variety | en_US |
