PJB-2020-8
GENETIC AND MOLECULAR EVALUATION OF RICE GENOTYPES FOR SALINITY TOLERANCE AT SEEDLING STAGE
SARA MAHMOUD SALHAH
Abstract
A major quantitative trait locus (QTL) for salt tolerance named Saltol was mapped on chromosome 1, which is responsible for high K+, low Na+ uptake and maintaining K+/Na+ homeostasis in rice. This study was conducted to assess the role of Saltol QTL in regards to effects of salt stress on seedling growth of diverse rice genotypes at seedling stage. A greenhouse study was designed to assess salinity tolerance of twenty five rice genotypes under Egyptian conditions. The genotypes were classified as tolerant, moderately tolerant and susceptible. Genotype PSBRc50 had similarity with FL478 haplotype exhibiting better K+/Na+ ratio. The RBL lines derived from a cross between Giza179 and FL478 exhibited better performance under salinity at seedling stage for most of the studied traits and also showed similarity with FL478 haplotype. The combination of four markers, RM493, RM10711, Wn11466 and Wn13903 found to be useful for marker-assisted selection of Saltol QTL at seedling stage in rice.
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