Identification of Quantitative Trait Loci related to plant height, number of tiller and flag leaf length and width in rice)Oryza sativa L.) using microsattelite markers

A population including 59 advanced backcross lines (BC2F5) which derived from the cross between IR64 as recurrent parent and Tarom molaei as donor parent, studied in order to map and determine the characters of QTLs for some quantitative traits in rice. The parental survey and genotyping were done by 235 and 114 SSR markers, respectively. Positive and/or negative transgressive segregationes were observed for all traits. From the QTLs mapped for all traits, at least one QTLs with additive effect mapped for all chromosomes, except of chromosomes 5, 9, and 12 with no QTL. Using multiple interval mapping, a total of 27 QTLs were detected, of which 3 were for plant height, 5 for number of tillers, 0 for flag leaf length (FLL), 10 for flag leaf width (FLW), and 9 for FLL/FLW. More than 44% of QTLs had negative additive effects. The maximum and minimum number of QTLs were mapped in chromosomes 1 with 9 QTLs, and chromosomes 3, 6, and 8 with one QTL, respectively. The digenic epistatic effect observed only for number of tiller with two additibe by additive interactions.