Abstract
The detection of QTL by association genetics depends on the genetic architecture of the trait under study, the size and structure of the investigated population and the availability of phenotypic and marker data of sufficient quality and quantity. In roses, we previously demonstrated that major QTL could already be detected in small association panels. In this study, we analyzed petal number, petal size and fragrance in a small panel of 95 mostly tetraploid garden rose genotypes. After genotyping the panel with the 68 K Axiom WagRhSNP chip we detected major QTL for all three traits. Each trait was significantly influenced by several genomic regions. Some of the QTL span genomic regions that comprise several candidate genes. Selected markers from some of these regions were converted into KASP markers and were validated in independent populations of up to 282 garden rose genotypes. These markers demonstrate the robustness of the detected effects independent of the set of genotypes analyzed. Furthermore, the markers can serve as tools for marker-assisted breeding in garden roses. Over an extended timeframe, they may be used as a starting point for the isolation of the genes underlying the QTL.
Highlights
Floriculture is one of the most economically important sectors of horticultural business.Among the traits that determine the success of floricultural products, the morphological and physiological characteristics of flowers as for example the colour, the fragrance and the structure of the flower are among the most important traits
We previously demonstrated that major QTL could already be detected in small association panels
Selected markers from some of these regions were converted into Kompetitive Alelle Specific PCR (KASP) markers and were validated in independent populations of up to 282 garden rose genotypes
Summary
Among the traits that determine the success of floricultural products, the morphological and physiological characteristics of flowers as for example the colour, the fragrance and the structure of the flower (petal number, flower size, shape) are among the most important traits. The aesthetic features of rose flowers are of central importance for the ornamental quality of rose cultivars; commercial breeding gives special attention to floral characteristics. E.g., the number and color of petals, were among the first traits investigated in genetic studies [2,3]. A large number of studies have addressed the basic aspects of unique features of the rose flower, e.g., the unique composition of scent metabolites that make up the rose fragrance [4,5,6,7,8,9,10]
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