The mode of inheritance in tetraploid cut roses

C F S Koning-Boucoiran,M J M Smulders,Z Yan,C Maliepaard,F A Krens,J Van Der Schoot,O Dolstra,G E Uenk,C G Van Der Linden,V W Gitonga,K Verlinden

doi:10.1007/s00122-012-1855-1

Abstract

Tetraploid hybrid tea roses (Rosa hybrida) represent most of the commercial cultivars of cut roses and form the basis for breeding programmes. Due to intensive interspecific hybridizations, modern cut roses are complex tetraploids for which the mode of inheritance is not exactly known. The segregation patterns of molecular markers in a tetraploid mapping population of 184 genotypes, an F1 progeny from a cross of two heterozygous parents, were investigated for disomic and tetrasomic inheritance. The possible occurrence of double reduction was studied as well. We can exclude disomic inheritance, but while our observations are more in line with a tetrasomic inheritance, we cannot exclude that there is a mixture of both inheritance modes. Two novel parental tetraploid linkage maps were constructed using markers known from literature, combined with newly generated markers. Comparison with the integrated consensus diploid map (ICM) of Spiller et al. (Theor Appl Genet 122:489–500, 2010) allowed assigning numbers to each of the linkage groups of both maps and including small linkage groups. So far, the possibility of using marker-assisted selection in breeding of tetraploid cut roses and of other species with a tetrasomic or partly tetrasomic inheritance, is still limited due to the difficulties in establishing marker-trait associations. We used these tetraploid linkage maps to determine associations between markers, two morphological traits and powdery mildew resistance. The knowledge on inheritance and marker-trait associations in tetraploid cut roses will be of direct use to cut rose breeding.Electronic supplementary materialThe online version of this article (doi:10.1007/s00122-012-1855-1) contains supplementary material, which is available to authorized users.

Highlights

Roses belong to the genus Rosa L. of the family of the Rosaceae, comprising about 180 species and thousands of cultivars (Debener and Linde 2009)
Tetraploid hybrid tea roses represent most of the commercial cultivars for cut roses currently available on the market, and they still form the basis of breeding programmes
The tetraploid rose population K5 from Yan (2005) investigated in this study consists of the offspring of a cross between two tetraploid genotypes P540 and P867 from a cut rose hybrid tea breeding programme

Summary

Introduction

Roses belong to the genus Rosa L. of the family of the Rosaceae, comprising about 180 species and thousands of cultivars (Debener and Linde 2009). A interesting new group formed the tea roses obtained by crossing two of the Chinese roses with various Bourbon (3x & 4x) and Noisette roses (2x), which were crossed with hybrid perpetual roses (4x) (Zlesak 2007), in which the tetraploidy originated from R. gallica (4x) These modern roses show vigorous growth and their large flowers. If breeders want to make use of such traits in their breeding programme or if they want to enlarge the genetic basis of hybrid tea roses, a good understanding of the inheritance mode of tea rose is needed to implement an appropriately designed breeding programme This will improve the efficiency and facilitate the transfer of novel traits into tetraploid cultivars such as disease resistances or new flower types (Byrne and Crane 2003)

Objectives

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Conclusion