نقشه یابی ژنهای کنترل کننده عملکرد و کیفیت 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 droughted and irrigated conditions at Kamalabad Research Station, Karaj, Iran in 2010. At harvest, traits such as root yield, sugar yield, white sugar yield and sugar content 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 all traits under the both water treatments. Totally, 26 QTLs were identified. The effects of all QTLs, except the QTL of sugar content in droughted conditions were significant at 1% probability level. Each QTL explained more than 10% of the phenotypic variance. QTLs commonly identified under the both water treatments could be useful for drought tolerance selection in sugar beet.