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The Seed Protein, Oil, and Yield QTL on Soybean Linkage Group I

^a Dep. of Agronomy, Agric. College, GyeongSang National Univ., 900 Gaza-Dong, Chinju City, Geyong-Nam, South Korea, 660-701
^b Botany Dep., Iowa State Univ., Ames, IA 50011
^c Dep. of Agronomy & Horticulture, Univ. of Nebraska, Lincoln, NE 68583-0915
^d USDA, ARS, Bldg. 006, Room 100, BARC-West, 10300 Baltimore Ave., Beltsville, MD
^e USDA, ARS, Corn Insect and Crop Genetics Research Unit, Dep. of Agronomy, Iowa State Univ., Ames, IA 50011

View larger version (102K): [in a new window]   Fig. 1. A genetic linkage map derived from a marker analysis of 76 F5:6 recombinant inbred lines of the Asgrow A3733 x PI 437088A mating. The 417 markers of this map coalesced into 35 linkage groups which were matched, on the basis of SSR marker homology, to the 20 known and named A through O soybean linkage groups (Cregan et al., 1999). Numerical marker distances were deleted to minimize figure size, but all linkage groups are shown on the same proportionate scale. The Haldane mapping function (centimorgan units) was used to create the map. The small solid rectangle in linkage group (LG) I denotes the map position of the protein, oil, and yield QTL(s).

View larger version (50K): [in a new window]   Fig. 2. A graph of seed protein (left axis- square symbols) and seed oil (right axis-circle symbols) versus seed yield (bottom axis) of each of the 76 F5–derived recombinant inbred lines (RILs) in 1996 and 1997. The solid and open symbols represent RILs with a respective AA (Asgrow A3733) or BB (PI 437.088A) parental genotype at the RAPD marker locus OPAW13a. Trend lines and b coefficients in the right text boxes were generated by linear regression of RIL protein or oil on the yield of the same RIL. The b coefficients of protein regressed on oil, and oil regressed on protein, are shown in the left text box, and the square root of product of those b coefficients is the correlation of protein with oil.

View larger version (33K): [in a new window]   Fig. 3. A graph of LOD score versus map distance (in centimorgans) in the upper portion of soybean linkage group I for seed protein, oil, and yield in 1996 and 1997. The LOD scores were derived from linear regression (LR- diamond symbols), simple interval mapping (SIM-thin lines), and composite interval mapping (CIM-thick lines) analyses. The permutation-derived (n = 1000 per trait) LOD score significance criteria were 3.4, 3.2 (horizontal thin lines), and 3.8 (horizontal thick lines), respectively. For the protein QTL plot, the effects of the closest dominant RAPD marker OPAW13a and closest flanking SSR markers (Satt496 and Satt239) are indicated.