Detection of QTLs for crossability in wheat using a doubled haploid population

An intervarietal molecular-marker map was used for the detection of genomic regions influencing crossability between wheat (Triticum aestivum L. em Th ell) and rye (Secale cereale L.). Analysis of deviance and logistic marker- regression methods were conducted on data from doubled haploid lines from a cross between "Courtot" and "Chinese Spring". A major quantitative trait l ocus (QTL) involved in crossability, associated with the marker Xfba367-5B, was detected on the short arm of chromosome 5B. An additional locus, Xwg58 3-5B, was indicated on the long arm of chromosome 5B, This minor QTL might correspond to Kr1 which was presumed to be the major gene controlling cross ability. Another locus of the genome, Xtam51-7A on chromosome 7A, was signi ficantly associated with this trait. Alleles of "non-crossability" were con tributed by the non-crossable cultivar "Courtot". The three-marker model ex plains 65% of the difference in crossability between the two parents. The p resent results are discussed in relation to those previously carried out to locate the Kr genes by using the telocentric mapping technique.