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- W2740347811 abstract "Salinity is an important abiotic stress affecting rice production worldwide. Development of salt tolerant varieties is the most feasible approach for improving rice productivity in salt affected soils. In rice, seedling stage salinity tolerance is crucial for better crop establishment. Quantitative trait loci (QTL) mapping using introgression lines (ILs) is useful for identification and simultaneous transfer of desirable alleles into elite genetic background. In the present study, 138 ILs derived from the cross between a high yielding elite salt susceptible japonica rice cultivar Jupiter and a salt tolerant indica landrace Nona Bokra were evaluated for salt tolerance at seedling stage in a hydroponics experiment and were genotyped using 126 simple sequence repeat markers. A total of 33 additive QTLs were detected by composite interval mapping for 8 morphophysiological traits. The phenotypic responses, genomic composition, and QTLs identified from the study indicated that Na/K ratio is the key factor for salinity tolerance. The mechanisms of tolerance might be due to homeostasis between Na+ and K+ or Na+ compartmentation. Gene ontology (GO) analysis revealed that significant GO terms in the selected QTL regions were associated with the genes/pathways involved in signaling, enzyme inhibition, and ion transport. Because majority of QTLs are with small effects, marker-assisted recurrent selection is proposed to accumulate favorable alleles for improving salt tolerance using the tolerant ILs identified in this study. The tolerant ILs also provide an opportunity for functional genomics studies to provide molecular insights into salt tolerance mechanisms in Nona Bokra." @default.
- W2740347811 created "2017-08-08" @default.
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- W2740347811 date "2017-07-26" @default.
- W2740347811 modified "2023-10-17" @default.
- W2740347811 title "Genetic Dissection of Seedling Stage Salinity Tolerance in Rice Using Introgression Lines of a Salt Tolerant Landrace Nona Bokra" @default.
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- W2740347811 doi "https://doi.org/10.1093/jhered/esx067" @default.
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