Mapping quantitative trait loci (QTL) controlling seed morphology and disk diameter in sunflower (Helianthus annuus L

This paper reports the results of analyzing the quantitative trait loci (QTL) underlying seed morphological traits in a segregating population derived from an oilseed by confection cross. A linkage map containing 165 target region amplification polymorphism (TRAP) and 44 simple sequence repeat (SSR) markers was constructed from 120 F2 plants. This map contained 17 linkage groups and spanned a total genetic distance of 1784.3 cM. A total of 52 QTL for 12 seed traits were detected and 32 of them were identified in both F2 and F2:3 generations. Each QTL explained 5.1-29.3 % of the phenotypic variation, suggesting these traits were controlled by multiple genes. Most of the QTL were clustered in seven chromosomal regions and four of these regions were located in the same chromosomal regions as previously reported by other researchers studying similar QTL. Moreover, alleles from the confection line at these QTL had positive effects on these traits. The information generated by this study will useful in confection sunflower breeding