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Genetics of Soybean Agronomic Traits

I. Comparison of Three Related Recombinant Inbred Populations

^a Dep. of Agronomy and Plant Genetics, Univ. of Minnesota, St. Paul, MN 55108 USA
^b Dep. of Biology, Univ. of Utah, Salt Lake City, UT 84112 USA
^c Facultad de Agronomia, Universidad Catholica de Valpariso, Casilla 4-D, Quillota, Chile
^d USDA-ARS Soybean and Alfalfa Research Lab., Beltsville, MD 20705 USA

View larger version (143K): [in a new window]   Fig. 1 Composite genetic map of the MN (Minsoy-Noir 1), MA (Minsoy-Archer), and NA (Noir 1-Archer) populations. The symbols to the left of the marker names indicate the mapping population(s) for which marker data are available (•= MN, = NA, = MA). The first number to the right of the marker names indicates the map distance (in centimorgans) to the next marker, and the second number is the genome position of the marker. Linkage groups are labeled with both the Utah names and [in parentheses, e.g., (J)] the Iowa names (see Cregan et al., 1999, for comparison of the Utah and Iowa maps)

View larger version (40K): [in a new window]   Fig. 2 Correlation of yield with 14 other traits in the MN (Minsoy-Noir 1) (), MA (Minsoy-Archer) (x), and NA (Noir 1-Archer) (o) populations. The vertical error bars represent a 97.5% confidence interval for the correlation. Wherever the error bars from two correlations do not overlap the correlations are significantly different at 0.05 threshold. Traits were (HDL) height divided by lodging; (HT) plant height; (LDG) lodging; (LL) leaf length; (AR) leaf area, (LW) leaf width; (OIL) seed oil content; (PRO) seed protein content; (R1) days to flowering; (R8) days to maturity; (RP) reproductive period; (SW) seed weight as mg/seed; (YD/HT) yield per unit height; (YD/SW) seed number

View larger version (48K): [in a new window]   Fig. 3 QTL genome scans for five different traits in each of the three RI populations. Each graph displays the complete simple interval-mapping scan for a particular population and trait (see materials and methods). The genome position (x-axis) is graphed against the LOD score (y-axis). Vertical lines on the x-axis indicate the boundaries of linkage groups. For these populations a LOD score of 3.7 is significant at a threshold of 0.05 for the experiment (the probability of finding a QTL with a LOD of 3.7 by chance, after scanning all of the markers in the genome). The populations are MN = Minsoy-Noir 1, MA = Minsoy-Archer, and NA = Noir 1-Archer. The traits are (RP) reproductive period, (R8) maturity, (YD) seed yield, (YD/HT) yield per unit height, and (HT) height