نقشه یابی ژنهای صفات مورفوفیزیولوژیک چغندرقند در شرایط تنش و بدون تنش خشکی

In this research, 142 F2:3 families along with their original parents were studied in a simple lattice design under well-watered and water-limited conditions at Kamalabad Research Station, Karaj, Iran in 2010. During the growing season, traits such as leaf number, specific leaf weight, percent crop cover and carbon isotope discrimination (Delta) were measured. Genetic linkage map was constructed using 759 SSR and SNP markers. Quantitative trait loci (QTL) mapping was carried out by composite interval mapping. Analysis of variance showed significant differences among genotypes for most of the traits under the both water treatments. Totally, 21 QTLs were identified. In well-watered conditions, the effects of the QTLs for leaf number and percent crop cover were significant at 5% and those of the other traits were significant at 1% probability level. Each of Delta QTLs explained more than 10% of the phenotypic variance. QTLs commonly identified for Delta under the both water treatments could be useful for drought tolerance selection in sugar beet.