Title: QTL analysis of variation for vigour in rose.
Authors: Yan, Z.; Visser, P. B.; Hendriks, T.; Prins, T. W.; Stam, P.; Dolstra, O.
Authors affiliation: Plant Research International B.V., Wageningen University and Research Centre, Wageningen, Neth.
Published in: Euphytica (2007), 154(1-2), pages 53-62.
Abstract: “The improvement of energy efficiency in the greenhouse prodn. of cut rose and pot rose can be achieved through the use of rose cultivars having vigorous growth. A better understanding of the inheritance of vigour and its related traits will assist the breeding activities. Quant. trait locus (QTL) analyses were performed with the help of an integrated linkage map of a diploid rose population originating from a cross between Rosa multiflora-derived genotypes. The underlying datasets for ten vigour-related traits were collected in an evaluation study of this population in two greenhouse expts. with suboptimal temps. for growth. We identified ten chromosomal regions, scattered over the seven linkage groups, contg. QTLs for these traits. Considering each trait sep., we detected a total of 42 QTLs. Among these QTLs, 24 were found in both of the expts., eight and ten were specific to either of the two expts. The no. of QTLs for individual traits varied from three to five with a resp. contribution to the phenotypic variation from 12 to 35%. QTLs for highly correlated traits frequently co-localized, indicating a common genetic basis. Clustering of QTLs for different traits was noted in some chromosome regions, for instance, one on chromosome 2 included major QTLs for eight of ten traits under study, suggesting co-localization of several sep. genes or/and the occurrence of various genes having pleiotropic effects. The discovery of markers assocd. to QTL regions is in roses the first step towards marker-assisted selection for vigour improvement enabling the transfer of useful QTL-alleles of R. multiflora to pot and cut roses.”