A new broccoli × broccoli immortal mapping population and framework genetic map: tools for breeders and complex trait analysis.
A unique broccoli × broccoli doubled haploid (DH) population has been created from the F(1) of a cross between two DH broccoli lines derived from cultivars Green Duke and Marathon. We genotyped 154 individuals from this population with simple sequence repeat and amplified fragment length polymorphism markers to create a B. oleracea L. var. italica 'intra-crop' specific framework linkage map. The map is composed of nine linkage groups with a total length of 946.7 cM. Previous published B. oleracea maps have been constructed using diverse crosses between morphotypes of B. oleracea; this map therefore represents a useful breeding resource for the dissection of broccoli specific traits. Phenotype data have been collected from the population over five growing seasons; the framework linkage map has been used to locate quantitative trait loci for agronomically important broccoli traits including head weight (saleable yield), head diameter, stalk diameter, weight loss and relative weight loss during storage, as well as traits for broccoli leaf architecture. This population and associated linkage map will aid breeders to directly map agronomically important traits for the improvement of elite broccoli cultivars.
School of Life Sciences, The University of Warwick, Wellesbourne, Warwick, CV359EF, UK.
Peter Glen
PG
Walley
John
J
Carder
Emma
E
Skipper
Evy
E
Mathas
James
J
Lynn
David
D
Pink
Vicky
V
Buchanan-Wollaston
D054458:Amplified Fragment Length Polymorphism Analysis; D001937:Brassica / Q000033:anatomy & histology / Q000235:genetics*; D001947:Breeding / Q000379:methods*; D002874:Chromosome Mapping; D003433:Crosses, Genetic; D017931:DNA Primers / Q000235:genetics; D005838:Genotype; D016014:Linear Models; D018895:Microsatellite Repeats / Q000235:genetics; D010641:Phenotype; D018515:Plant Leaves / Q000033:anatomy & histology*; D040641:Quantitative Trait Loci / Q000235:genetics*; D013045:Species Specificity
D017931:DNA Primers