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Soybean Cultivars Resulted from More Recombination Events Than Unselected Lines in the Same Population

^a 322 Plant Sciences Bld., Dep. of Agronomy, University of Kentucky, Lexington, KY 40546-0312
^b Department of Agronomy, University of Kentucky, Lexington, KY 40546
^c Department of Plant Sciences and Landscape Systems, University of Tennessee, Knoxville, TN 37901

View larger version (32K): [in a new window]   Fig. 1. Schematic representation of the relative positions of the 143 SSR markers on soybean's 20 molecular linkage groups (Cregan et al. 1999) used to identify regions of crossing-over in the progeny of Williams x Essex.

View larger version (18K): [in a new window]   Fig. 2. Frequency distribution of standardized crossovers (actual crossovers/potential crossovers where potential crossovers = number of marker loci per linkage group – 1) averaged across 20 linkage groups for 156 random inbred lines and 10 cultivars from the soybean population Williams x Essex.

View larger version (21K): [in a new window]   Fig. 3. Standardized crossover (actual crossovers/potential crossovers) means for the cultivars and RILs (random lines) on the 20 soybean chromosomes [defined by the 20 molecular linkage groups (Cregan et al. 1999). * Cultivars have significantly (p < 0.05) greater standardized crossovers than random lines.

View larger version (23K): [in a new window]   Fig. 4. Schematic representation of the three linkage groups for which, cultivars had significantly greater recombination than the random lines. Molecular linkage groups, and marker positions are as found on the published soybean genetic map (Cregan et al. 1999) and confirmed in this population. Distances between markers were calculated by Mapmaker (Lander et al. 1987; Lincoln et al. 1992) for the Williams x Essex population. QTL were previously reported. QTL followed by numbers are so designated by Hyten 2002. Yield QTL reported in Orf et al. (1999). Lodging QTL reported in Lee et al. (1996b). ¶Seed size QTL reported in Csanadi et al. (2001).