A PARTIAL GENOME ASSAY FOR QUANTITATIVE TRAIT LOCI IN WHEAT (TRITICUM-AESTIVUM) USING DIFFERENT ANALYTICAL TECHNIQUES

F-1 plants between two intervarietal chromosome substitution lines of European spring wheat varieties, 'Sicco' ('Chinese Spring 5B') and 'Hi ghbury' ('Chinese Spring 5B'), were used to produce 114 doubled haploi d lines, 45 by the Hordeum bulbosum technique and 69 by anther culture . These two sets of lines were characterized for variation at a range of morphological, isozyme and RFLP marker loci, and genetic maps were developed with emphasis on chromosomes 6B, 7A, 7B and 7D. A subset of lines, scored for production traits in field trials in 1986 and 1987, were analysed for quantitative trait loci (QTL). The performance of th e lines for the quantitative traits studied showed no overall differen ces due to the method of production of the lines. QTL were located on the linkage map for ear emergence time, height, tiller weight, yield a nd 50-grain weight using four analytical methods. Many of these effect s showed genotype x year interaction.